Improves "save as Excel" functionality (#2266)

Packages.props

@@ -57,6 +57,8 @@
 		<PackageReference Update="coverlet.collector" Version="6.0.0" />
 		<PackageReference Update="coverlet.msbuild" Version="6.0.0" />
 		<PackageReference Update="Microsoft.SqlServer.XEvent.XELite" Version="2023.1.30.3" />
+		<PackageReference Update="SkiaSharp" Version="2.88.6" />
+		<PackageReference Update="SkiaSharp.NativeAssets.Linux.NoDependencies" Version="2.88.6" Condition="$([MSBuild]::IsOsPlatform('Linux'))" />
 	</ItemGroup>
 
 	<!-- When updating version of Dependencies in the below section, please also update the version in the following files:

src/Microsoft.SqlTools.ServiceLayer/Microsoft.SqlTools.ServiceLayer.csproj

@@ -50,6 +50,8 @@
 		<PackageReference Include="Microsoft.SqlServer.Management.SmoMetadataProvider" />
 		<PackageReference Include="Microsoft.SqlServer.SqlManagementObjects" />
 		<PackageReference Include="Microsoft.SqlServer.Management.SqlParser" />
+		<PackageReference Include="SkiaSharp" />
+		<PackageReference Include="SkiaSharp.NativeAssets.Linux.NoDependencies" Condition="$([MSBuild]::IsOsPlatform('Linux'))" />
 		<PackageReference Include="System.Configuration.ConfigurationManager" />
 		<PackageReference Include="System.Text.Encoding.CodePages" />
 		<PackageReference Include="Microsoft.SqlServer.XEvent.XELite" />

src/Microsoft.SqlTools.ServiceLayer/QueryExecution/Contracts/SaveResultsRequest.cs

@@ -115,6 +115,26 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.Contracts
         /// Include headers of columns in Excel 
         /// </summary>
         public bool IncludeHeaders { get; set; }
+
+        /// <summary>
+        /// Freeze header row in Excel 
+        /// </summary>
+        public bool FreezeHeaderRow { get; set; }
+
+        /// <summary>
+        /// Bold header row in Excel 
+        /// </summary>
+        public bool BoldHeaderRow { get; set; }
+
+        /// <summary>
+        /// Enable auto filter on header row in Excel 
+        /// </summary>
+        public bool AutoFilterHeaderRow { get; set; }
+
+        /// <summary>
+        /// Auto size columns in Excel 
+        /// </summary>
+        public bool AutoSizeColumns { get; set; }
     }
 
     /// <summary>

src/Microsoft.SqlTools.ServiceLayer/QueryExecution/Contracts/Serialization.cs

@@ -157,6 +157,30 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.Contracts
             get { return this.GetOptionValue<int>(SerializationOptionsHelper.MaxCharsToStore); }
             set { this.SetOptionValue<int>(SerializationOptionsHelper.Formatted, value); }
         }
+
+        public bool FreezeHeaderRow
+        {
+            get { return this.GetOptionValue<bool>(SerializationOptionsHelper.FreezeHeaderRow); }
+            set { this.SetOptionValue<bool>(SerializationOptionsHelper.FreezeHeaderRow, value); }
+        }
+
+        public bool BoldHeaderRow
+        {
+            get { return this.GetOptionValue<bool>(SerializationOptionsHelper.BoldHeaderRow); }
+            set { this.SetOptionValue<bool>(SerializationOptionsHelper.BoldHeaderRow, value); }
+        }
+
+        public bool AutoFilterHeaderRow
+        {
+            get { return this.GetOptionValue<bool>(SerializationOptionsHelper.AutoFilterHeaderRow); }
+            set { this.SetOptionValue<bool>(SerializationOptionsHelper.AutoFilterHeaderRow, value); }
+        }
+
+        public bool AutoSizeColumns
+        {
+            get { return this.GetOptionValue<bool>(SerializationOptionsHelper.AutoSizeColumns); }
+            set { this.SetOptionValue<bool>(SerializationOptionsHelper.AutoSizeColumns, value); }
+        }
     }
 
     public class SerializeDataResult
@@ -184,5 +208,9 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.Contracts
         internal const string Encoding = "encoding";
         internal const string Formatted = "formatted";
         internal const string MaxCharsToStore = "maxchars";
+        internal const string FreezeHeaderRow = "freezeHeaderRow";
+        internal const string BoldHeaderRow = "boldHeaderRow";
+        internal const string AutoFilterHeaderRow = "autoFilterHeaderRow";
+        internal const string AutoSizeColumns = "autoSizeColumns";
     }
 }

src/Microsoft.SqlTools.ServiceLayer/QueryExecution/DataStorage/SaveAsExcelFileStreamWriter.cs

@@ -5,9 +5,11 @@
 
 #nullable disable
 
+using System;
 using System.Collections.Generic;
 using System.IO;
 using Microsoft.SqlTools.ServiceLayer.QueryExecution.Contracts;
+using SkiaSharp;
 
 namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
 {
@@ -16,14 +18,28 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
     /// </summary>
     public class SaveAsExcelFileStreamWriter : SaveAsStreamWriter
     {
+        // Font family used in Excel sheet
+        private const string FontFamily = "Calibri";
 
+        // Font size in Excel sheet (points with conversion to pixels)
+        private const float FontSizePixels = 11F * (96F / 72F);
+
+        // Pixel width of auto-filter button
+        private const float AutoFilterPixelWidth = 17F;
+        
         #region Member Variables
 
         private readonly SaveResultsAsExcelRequestParams saveParams;
+        private readonly float[] columnWidths;
+        private readonly int columnEndIndex;
+        private readonly int columnStartIndex;
+        private readonly SaveAsExcelFileStreamWriterHelper helper;
+
         private bool headerWritten;
-        private SaveAsExcelFileStreamWriterHelper helper;
         private SaveAsExcelFileStreamWriterHelper.ExcelSheet sheet;
 
+        private SKPaint paint;
+
         #endregion
 
         /// <summary>
@@ -41,7 +57,89 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
         {
             saveParams = requestParams;
             helper = new SaveAsExcelFileStreamWriterHelper(stream);
-            sheet = helper.AddSheet();
+
+            // Do some setup if the caller requested automatically sized columns
+            if (requestParams.AutoSizeColumns)
+            {
+                // Set column counts depending on whether save request is for entire set or a subset
+                columnEndIndex = columns.Count;
+                columnStartIndex = 0;
+                var columnCount = columns.Count;
+
+                if (requestParams.IsSaveSelection)
+                {
+                    // ReSharper disable PossibleInvalidOperationException  IsSaveSelection verifies these values exist
+                    columnEndIndex = requestParams.ColumnEndIndex.Value + 1;
+                    columnStartIndex = requestParams.ColumnStartIndex.Value;
+                    columnCount = columnEndIndex - columnStartIndex;
+                    // ReSharper restore PossibleInvalidOperationException
+                }
+
+                columnWidths = new float[columnCount];
+
+                // If the caller requested headers the column widths can be initially set based on the header values
+                if (requestParams.IncludeHeaders)
+                {
+                    // Setup for measuring the header, set font style based on whether the header should be bold or not
+                    using var headerPaint = new SKPaint();
+                    headerPaint.Typeface = SKTypeface.FromFamilyName(FontFamily, requestParams.BoldHeaderRow ? SKFontStyle.Bold : SKFontStyle.Normal);
+                    headerPaint.TextSize = FontSizePixels;
+                    var skBounds = SKRect.Empty;
+
+                    // Loop over all the columns
+                    for (int columnIndex = columnStartIndex; columnIndex < columnEndIndex; ++columnIndex)
+                    {
+                        var columnNumber = columnIndex - columnStartIndex;
+
+                        // Measure the header text
+                        var textWidth = headerPaint.MeasureText(columns[columnIndex].ColumnName.AsSpan(), ref skBounds);
+
+                        // Add extra for the auto filter button if requested
+                        if (requestParams.AutoFilterHeaderRow)
+                        {
+                            textWidth += AutoFilterPixelWidth;
+                        }
+
+                        // Just store the width as a starting point
+                        columnWidths[columnNumber] = textWidth;
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        /// Excel supports specifying column widths so measure if the user wants the columns automatically sized
+        /// </summary>
+        public override bool ShouldMeasureRowColumns => saveParams.AutoSizeColumns;
+
+        /// <summary>
+        /// Measures each column of a row of data and stores updates the maximum width of the column if needed
+        /// </summary>
+        /// <param name="row">The row of data to measure</param>
+        public override void MeasureRowColumns(IList<DbCellValue> row)
+        {
+            // Create the paint object if not done already
+            if (paint == null)
+            {
+                paint = new SKPaint();
+
+                paint.Typeface = SKTypeface.FromFamilyName(FontFamily);
+                paint.TextSize = FontSizePixels;
+            }
+
+            var skBounds = SKRect.Empty;
+
+            // Loop over all the columns
+            for (int columnIndex = columnStartIndex; columnIndex < columnEndIndex; ++columnIndex)
+            {
+                var columnNumber = columnIndex - columnStartIndex;
+
+                // Measure the width of the text
+                var textWidth = paint.MeasureText(row[columnIndex].DisplayValue.AsSpan(), ref skBounds);
+
+                // Update the max if the new width is greater
+                columnWidths[columnNumber] = Math.Max(columnWidths[columnNumber], textWidth);
+            }
         }
 
         /// <summary>
@@ -55,13 +153,44 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
         /// </param>
         public override void WriteRow(IList<DbCellValue> row, IReadOnlyList<DbColumnWrapper> columns)
         {
+            // Check to make sure the sheet has been created
+            if (sheet == null)
+            {
+                // Get rid of any paint object from the auto-sizing
+                paint?.Dispose();
+
+                // Create the blank sheet
+                sheet = helper.AddSheet(null, columns.Count);
+
+                // The XLSX format has strict ordering requirements so these must be done in the proper order
+                
+                // First freeze the header row if the caller has requested header rows and that the header should be frozen
+                if (saveParams.IncludeHeaders && saveParams.FreezeHeaderRow)
+                {
+                    sheet.FreezeHeaderRow();
+                }
+
+                // Next if column widths have been specified they should be saved to the sheet
+                if (columnWidths != null)
+                {
+                    sheet.WriteColumnInformation(columnWidths);
+                }
+
+                // Lastly enable auto filter if the caller has requested header rows and that the header should be frozen 
+                if (saveParams.IncludeHeaders && saveParams.AutoFilterHeaderRow)
+                {
+                    sheet.EnableAutoFilter();
+                }
+            }
+
             // Write out the header if we haven't already and the user chose to have it
             if (saveParams.IncludeHeaders && !headerWritten)
             {
                 sheet.AddRow();
                 for (int i = ColumnStartIndex; i <= ColumnEndIndex; i++)
                 {
-                    sheet.AddCell(columns[i].ColumnName);
+                    // Add the header text and bold if requested
+                    sheet.AddCell(columns[i].ColumnName, saveParams.BoldHeaderRow);
                 }
                 headerWritten = true;
             }
@@ -74,7 +203,7 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
         }
 
         private bool disposed;
-        override protected void Dispose(bool disposing)
+        protected override void Dispose(bool disposing)
         {
             if (disposed)
                 return;

src/Microsoft.SqlTools.ServiceLayer/QueryExecution/DataStorage/SaveAsExcelFileStreamWriterHelper.cs

@@ -6,6 +6,7 @@
 using System;
 using System.Collections.Generic;
 using System.Data.SqlTypes;
+using System.Globalization;
 using System.IO;
 using System.IO.Compression;
 using System.Xml;
@@ -75,21 +76,31 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
             // new TimeSpan(24,0,0).Ticks
             private const long TicksPerDay = 864000000000L;
 
+            // Digit pixel width for 11 point Calibri
+            private const float FontPixelWidth = 7;
+
             private XmlWriter writer;
             private ReferenceManager referenceManager;
             private bool hasOpenRowTag;
+            
+            private readonly int columnCount;
+            private bool autoFilterColumns;
+            private bool hasStartedSheetData;
 
             /// <summary>
             /// Initializes a new instance of the ExcelSheet class.
             /// </summary>
             /// <param name="writer">XmlWriter to write the sheet data</param>
-            internal ExcelSheet(XmlWriter writer)
+            /// <param name="columnCount">Number of columns in the new sheet</param>
+            internal ExcelSheet(XmlWriter writer, int columnCount)
             {
                 this.writer = writer;
+                this.columnCount = columnCount;
+
                 writer.WriteStartDocument();
                 writer.WriteStartElement("worksheet", "http://schemas.openxmlformats.org/spreadsheetml/2006/main");
                 writer.WriteAttributeString("xmlns", "r", null, "http://schemas.openxmlformats.org/officeDocument/2006/relationships");
-                writer.WriteStartElement("sheetData");
+
                 referenceManager = new ReferenceManager(writer);
             }
 
@@ -98,6 +109,13 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
             /// </summary>
             public void AddRow()
             {
+                // Write the open tag for sheetData if it hasn't been written yet
+                if (!hasStartedSheetData)
+                {
+                    writer.WriteStartElement("sheetData");
+                    hasStartedSheetData = true;
+                }
+
                 EndRowIfNeeded();
                 hasOpenRowTag = true;
 
@@ -110,8 +128,9 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
             /// <summary>
             /// Write a string cell
             /// </summary>
-            /// <param name="value">string value to write</param>
-            public void AddCell(string value)
+            /// <param name="value">String value to write</param>
+            /// <param name="bold">Whether the cell should be bold, defaults to false</param>
+            public void AddCell(string value, bool bold = false)
             {
                 // string needs <c t="inlineStr"><is><t>string</t></is></c>
                 // This class uses inlineStr instead of more common shared string table
@@ -129,21 +148,28 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
 
                 writer.WriteAttributeString("t", "inlineStr");
 
+                // Write the style attribute set to the bold font if requested
+                if (bold)
+                {
+                    writer.WriteAttributeString("s", "5");
+                }
+
                 writer.WriteStartElement("is");
                 writer.WriteStartElement("t");
                 writer.WriteValue(value);
-                writer.WriteEndElement();
-                writer.WriteEndElement();
+                writer.WriteEndElement();   // <t>
+                writer.WriteEndElement();   // <is>
 
-                writer.WriteEndElement();
+                writer.WriteEndElement();   // <c>
             }
 
             /// <summary>
             /// Write a object cell
             /// </summary>
             /// The program will try to output number/datetime, otherwise, call the ToString 
-            /// <param name="o"></param>
-            public void AddCell(DbCellValue dbCellValue)
+            /// <param name="dbCellValue">DbCellValue to write based on data type</param>
+            /// <param name="bold">Whether the cell should be bold, defaults to false</param>
+            public void AddCell(DbCellValue dbCellValue, bool bold = false)
             {
                 object o = dbCellValue.RawObject;
                 if (dbCellValue.IsNull || o == null)
@@ -169,25 +195,100 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
                         AddCell((DateTime)o);
                         break;
                     case TypeCode.String:
-                        AddCell((string)o);
+                        AddCell((string)o, bold);
                         break;
                     default:
                         if (o is TimeSpan span) //TimeSpan doesn't have TypeCode
                         {
                             AddCell(span);
                         }
-                        // We need to handle SqlDecimal and SqlMoney types here because we can't convert them to .NET types due to different precisons in SQL Server and .NET.
+                        // We need to handle SqlDecimal and SqlMoney types here because we can't convert them to .NET types due to different precisions in SQL Server and .NET.
                         else if (o is SqlDecimal || o is SqlMoney)
                         {
                             AddCellBoxedNumber(dbCellValue.DisplayValue);
                         }
                         else
                         {
-                            AddCell(dbCellValue.DisplayValue);
+                            AddCell(dbCellValue.DisplayValue, bold);
                         }
                         break;
                 }
             }
+            
+            /// <summary>
+            /// Write a sheetView that freezes the top row.  Must be called before any rows have been added.
+            /// </summary>
+            /// <exception cref="InvalidOperationException">Thrown if called after any rows have been added.</exception>
+            public void FreezeHeaderRow()
+            {
+                if (hasStartedSheetData)
+                {
+                    throw new InvalidOperationException("Must be called before calling AddRow");
+                }
+
+                writer.WriteStartElement("sheetViews");
+
+                writer.WriteStartElement("sheetView");
+                writer.WriteAttributeString("tabSelected", "1");
+                writer.WriteAttributeString("workbookViewId", "0");
+
+                writer.WriteStartElement("pane");
+                writer.WriteAttributeString("ySplit", "1");
+                writer.WriteAttributeString("topLeftCell", "A2");
+                writer.WriteAttributeString("activePane", "bottomLeft");
+                writer.WriteAttributeString("state", "frozen");
+                writer.WriteEndElement();   // <pane>
+
+                writer.WriteStartElement("selection");
+                writer.WriteAttributeString("pane", "bottomLeft");
+                writer.WriteEndElement();   // <selection>
+
+                writer.WriteEndElement();   // <sheetView>
+                writer.WriteEndElement();   // <sheetViews>
+            }
+
+            /// <summary>
+            /// Enable auto filtering, the XML will be written when closing the sheet later
+            /// </summary>
+            public void EnableAutoFilter()
+            {
+                autoFilterColumns = true;
+            }
+
+            /// <summary>
+            /// Write the columns widths.  Must be called before any rows have been added.
+            /// </summary>
+            /// <param name="columnWidths">Array with the widths of each column.</param>
+            /// <exception cref="InvalidOperationException">Thrown if called after any rows have been added.</exception>
+            public void WriteColumnInformation(float[] columnWidths)
+            {
+                if (hasStartedSheetData)
+                {
+                    throw new InvalidOperationException("Must be called before calling AddRow");
+                }
+
+                if (columnWidths.Length != this.columnCount)
+                {
+                    throw new InvalidOperationException("Column count mismatch");
+                }
+
+                writer.WriteStartElement("cols");
+
+                for (int columnIndex = 0; columnIndex < columnWidths.Length; columnIndex++)
+                {
+                    var columnWidth = Math.Truncate((columnWidths[columnIndex] + 15) / FontPixelWidth * 256) / 256;
+
+                    writer.WriteStartElement("col");
+                    writer.WriteAttributeString("min", (columnIndex + 1).ToString());
+                    writer.WriteAttributeString("max", (columnIndex + 1).ToString());
+                    writer.WriteAttributeString("width", columnWidth.ToString(CultureInfo.InvariantCulture));
+                    writer.WriteAttributeString("bestFit", "1");
+                    writer.WriteAttributeString("customWidth", "1");
+                    writer.WriteEndElement();   // <col>
+                }
+
+                writer.WriteEndElement();   // <cols>
+            }
 
             /// <summary>
             /// Close the <row><sheetData><worksheet> tags and close the stream
@@ -196,6 +297,15 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
             {
                 EndRowIfNeeded();
                 writer.WriteEndElement(); // <sheetData> 
+
+                // Write the auto filter XML if requested
+                if (autoFilterColumns)
+                {
+                    writer.WriteStartElement("autoFilter");
+                    writer.WriteAttributeString("ref", $"A1:{ReferenceManager.GetColumnName(this.columnCount)}1");
+                    writer.WriteEndElement();   // <autoFilter>
+                }
+
                 writer.WriteEndElement(); // <worksheet>
                 writer.Dispose();
             }
@@ -203,7 +313,7 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
             /// <summary>
             /// Write a empty cell
             /// </summary>
-            /// This only increases the internal bookmark and doesn't arcturally write out anything.
+            /// This only increases the internal bookmark and doesn't actually write out anything.
             private void AddCellEmpty()
             {
                 referenceManager.IncreaseColumnReference();
@@ -212,7 +322,7 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
             /// <summary>
             /// Write a bool cell. 
             /// </summary>
-            /// <param name="time"></param>
+            /// <param name="value">Boolean value to write</param>
             private void AddCell(bool value)
             {
                 // Excel FALSE: <c r="A1" t="b"><v>0</v></c>
@@ -234,15 +344,15 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
                 {
                     writer.WriteValue("0");
                 }
-                writer.WriteEndElement();
+                writer.WriteEndElement();   // <v>
 
-                writer.WriteEndElement();
+                writer.WriteEndElement();   // <c>
             }
 
             /// <summary>
             /// Write a TimeSpan cell. 
             /// </summary>
-            /// <param name="time"></param>
+            /// <param name="time">TimeSpan value to write</param>
             private void AddCell(TimeSpan time)
             {
                 referenceManager.AssureColumnReference();
@@ -262,7 +372,7 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
             /// <summary>
             /// Write a DateTime cell.
             /// </summary>
-            /// <param name="dateTime">Datetime</param>
+            /// <param name="dateTime">DateTime value to write</param>
             /// <remark>
             /// If the DateTime does not have date part, it will be written as datetime and show as time only
             /// If the DateTime is before 1900-03-01, save as string because excel doesn't support them.
@@ -307,9 +417,9 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
 
                 writer.WriteStartElement("v");
                 writer.WriteValue(number);
-                writer.WriteEndElement();
+                writer.WriteEndElement();   // <v>
 
-                writer.WriteEndElement();
+                writer.WriteEndElement();   // <c>
             }
 
 
@@ -326,9 +436,9 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
 
                 writer.WriteStartElement("v");
                 writer.WriteValue(excelDate);
-                writer.WriteEndElement();
+                writer.WriteEndElement();   // <v>
 
-                writer.WriteEndElement();
+                writer.WriteEndElement();   // <c>
             }
 
             private void EndRowIfNeeded()
@@ -338,8 +448,6 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
                     writer.WriteEndElement(); // <row>
                 }
             }
-
-
         }
 
         /// <summary>
@@ -429,6 +537,26 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
                 }
             }
 
+            /// <summary>
+            /// Gets the column name (letters) from a column number
+            /// https://stackoverflow.com/questions/181596/how-to-convert-a-column-number-e-g-127-into-an-excel-column-e-g-aa
+            /// </summary>
+            /// <param name="columnNumber">The column number.</param>
+            /// <returns>The column name.</returns>
+            public static string GetColumnName(int columnNumber)
+            {
+                string columnName = "";
+
+                while (columnNumber > 0)
+                {
+                    int modulo = (columnNumber - 1) % 26;
+                    columnName = Convert.ToChar('A' + modulo) + columnName;
+                    columnNumber = (columnNumber - modulo) / 26;
+                }
+
+                return columnName;
+            }
+
             /// <summary>
             /// Check that we have not write too many rows. (xlsx has a limit of 1048576 rows) 
             /// </summary>
@@ -511,11 +639,11 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
         /// <param name="sheetName">Sheet name</param>
         /// <returns>ExcelSheet for writing the sheet content</returns>
         /// <remarks>
-        /// When the sheetName is null, sheet1,shhet2,..., will be used.
-        /// The following charactors are not allowed in the sheetName
+        /// When the sheetName is null, sheet1,sheet2,..., will be used.
+        /// The following characters are not allowed in the sheetName
         /// '\', '/','*','[',']',':','?'
         /// </remarks>
-        public ExcelSheet AddSheet(string sheetName = null)
+        public ExcelSheet AddSheet(string sheetName, int columnCount)
         {
             string sheetFileName = "sheet" + (sheetNames.Count + 1);
             sheetName ??= sheetFileName;
@@ -523,7 +651,7 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
 
             sheetNames.Add(sheetName);
             XmlWriter sheetWriter = AddEntry($"xl/worksheets/{sheetFileName}.xml");
-            return new ExcelSheet(sheetWriter);
+            return new ExcelSheet(sheetWriter, columnCount);
         }
 
         /// <summary>
@@ -568,26 +696,26 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
                 xw.WriteStartElement("Default");
                 xw.WriteAttributeString("Extension", "rels");
                 xw.WriteAttributeString("ContentType", "application/vnd.openxmlformats-package.relationships+xml");
-                xw.WriteEndElement();
+                xw.WriteEndElement();   // <Default>
 
                 xw.WriteStartElement("Override");
                 xw.WriteAttributeString("PartName", "/xl/workbook.xml");
                 xw.WriteAttributeString("ContentType", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml");
-                xw.WriteEndElement();
+                xw.WriteEndElement();   // <Override>
 
                 xw.WriteStartElement("Override");
                 xw.WriteAttributeString("PartName", "/xl/styles.xml");
                 xw.WriteAttributeString("ContentType", "application/vnd.openxmlformats-officedocument.spreadsheetml.styles+xml");
-                xw.WriteEndElement();
+                xw.WriteEndElement();   // <Override>
 
                 for (int i = 1; i <= sheetNames.Count; ++i)
                 {
                     xw.WriteStartElement("Override");
                     xw.WriteAttributeString("PartName", "/xl/worksheets/sheet" + i + ".xml");
                     xw.WriteAttributeString("ContentType", "application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml");
-                    xw.WriteEndElement();
+                    xw.WriteEndElement();   // <Override>
                 }
-                xw.WriteEndElement();
+                xw.WriteEndElement();   // <Types>
                 xw.WriteEndDocument();
             }
         }
@@ -607,9 +735,9 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
                 xw.WriteAttributeString("Id", "rId1");
                 xw.WriteAttributeString("Type", "http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument");
                 xw.WriteAttributeString("Target", "xl/workbook.xml");
-                xw.WriteEndElement();
+                xw.WriteEndElement();   // <Relationship>
 
-                xw.WriteEndElement();
+                xw.WriteEndElement();   // <Relationships>
 
                 xw.WriteEndDocument();
             }
@@ -648,7 +776,7 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
                     xw.WriteAttributeString("name", sheetNames[i - 1]);
                     xw.WriteAttributeString("sheetId", i.ToString());
                     xw.WriteAttributeString("r", "id", null, "rId" + i);
-                    xw.WriteEndElement();
+                    xw.WriteEndElement();   // <sheet>
                 }
                 xw.WriteEndDocument();
             }
@@ -668,7 +796,7 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
                 xw.WriteAttributeString("Id", "rId0");
                 xw.WriteAttributeString("Type", "http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles");
                 xw.WriteAttributeString("Target", "styles.xml");
-                xw.WriteEndElement();
+                xw.WriteEndElement();   // <Relationship>
 
                 for (int i = 1; i <= sheetNames.Count; i++)
                 {
@@ -676,9 +804,9 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
                     xw.WriteAttributeString("Id", "rId" + i);
                     xw.WriteAttributeString("Type", "http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet");
                     xw.WriteAttributeString("Target", "worksheets/sheet" + i + ".xml");
-                    xw.WriteEndElement();
+                    xw.WriteEndElement();   // <Relationship>
                 }
-                xw.WriteEndElement();
+                xw.WriteEndElement();   // <Relationships>
                 xw.WriteEndDocument();
             }
         }
@@ -702,41 +830,63 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
                 xw.WriteStartElement("numFmt");
                 xw.WriteAttributeString("numFmtId", "166");
                 xw.WriteAttributeString("formatCode", "yyyy-mm-dd");
-                xw.WriteEndElement();
+                xw.WriteEndElement();   // <numFmt>
                 xw.WriteStartElement("numFmt");
                 xw.WriteAttributeString("numFmtId", "167");
                 xw.WriteAttributeString("formatCode", "hh:mm:ss");
-                xw.WriteEndElement();
+                xw.WriteEndElement();   // <numFmt>
                 xw.WriteStartElement("numFmt");
                 xw.WriteAttributeString("numFmtId", "168");
                 xw.WriteAttributeString("formatCode", "yyyy-mm-dd hh:mm:ss");
-                xw.WriteEndElement();
+                xw.WriteEndElement();   // <numFmt>
                 xw.WriteStartElement("numFmt");
                 xw.WriteAttributeString("numFmtId", "169");
                 xw.WriteAttributeString("formatCode", "[h]:mm:ss");
-                xw.WriteEndElement();
-                xw.WriteEndElement(); //mumFmts
+                xw.WriteEndElement();   // <numFmt>
+                xw.WriteEndElement();   // <numFmts>
 
 
                 xw.WriteStartElement("fonts");
-                xw.WriteAttributeString("count", "1");
+                xw.WriteAttributeString("count", "2");
+
                 xw.WriteStartElement("font");
                 xw.WriteStartElement("sz");
                 xw.WriteAttributeString("val", "11");
-                xw.WriteEndElement();
+                xw.WriteEndElement();   // <sz>
                 xw.WriteStartElement("color");
                 xw.WriteAttributeString("theme", "1");
-                xw.WriteEndElement();
+                xw.WriteEndElement();   // <color>
                 xw.WriteStartElement("name");
                 xw.WriteAttributeString("val", "Calibri");
-                xw.WriteEndElement();
+                xw.WriteEndElement();   // <name>
                 xw.WriteStartElement("family");
                 xw.WriteAttributeString("val", "2");
-                xw.WriteEndElement();
+                xw.WriteEndElement();   // <family>
                 xw.WriteStartElement("scheme");
                 xw.WriteAttributeString("val", "minor");
-                xw.WriteEndElement();
-                xw.WriteEndElement(); // font
+                xw.WriteEndElement();   // <scheme>
+                xw.WriteEndElement();   // <font>
+
+                xw.WriteStartElement("font");
+                xw.WriteStartElement("b");
+                xw.WriteEndElement();   // <b>
+                xw.WriteStartElement("sz");
+                xw.WriteAttributeString("val", "11");
+                xw.WriteEndElement();   // <sz>
+                xw.WriteStartElement("color");
+                xw.WriteAttributeString("theme", "1");
+                xw.WriteEndElement();   // <color>
+                xw.WriteStartElement("name");
+                xw.WriteAttributeString("val", "Calibri");
+                xw.WriteEndElement();   // <name>
+                xw.WriteStartElement("family");
+                xw.WriteAttributeString("val", "2");
+                xw.WriteEndElement();   // <family>
+                xw.WriteStartElement("scheme");
+                xw.WriteAttributeString("val", "minor");
+                xw.WriteEndElement();   // <scheme>
+                xw.WriteEndElement();   // <font>
+
                 xw.WriteEndElement(); // fonts
 
                 xw.WriteStartElement("fills");
@@ -744,9 +894,9 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
                 xw.WriteStartElement("fill");
                 xw.WriteStartElement("patternFill");
                 xw.WriteAttributeString("patternType", "none");
-                xw.WriteEndElement(); // patternFill
-                xw.WriteEndElement(); // fill
-                xw.WriteEndElement(); // fills
+                xw.WriteEndElement();   // <patternFill>
+                xw.WriteEndElement();   // <fill>
+                xw.WriteEndElement();   // <fills>
 
                 xw.WriteStartElement("borders");
                 xw.WriteAttributeString("count", "1");
@@ -756,8 +906,8 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
                 xw.WriteElementString("top", null);
                 xw.WriteElementString("bottom", null);
                 xw.WriteElementString("diagonal", null);
-                xw.WriteEndElement(); // board
-                xw.WriteEndElement(); // borders
+                xw.WriteEndElement();   // <border>
+                xw.WriteEndElement();   // <borders>
 
                 xw.WriteStartElement("cellStyleXfs");
                 xw.WriteAttributeString("count", "1");
@@ -766,35 +916,39 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
                 xw.WriteAttributeString("fontId", "0");
                 xw.WriteAttributeString("fillId", "0");
                 xw.WriteAttributeString("borderId", "0");
-                xw.WriteEndElement(); // xf
-                xw.WriteEndElement(); // cellStyleXfs
+                xw.WriteEndElement();   // <xf>
+                xw.WriteEndElement();   // <cellStyleXfs>
 
                 xw.WriteStartElement("cellXfs");
-                xw.WriteAttributeString("count", "5");
+                xw.WriteAttributeString("count", "6");
                 xw.WriteStartElement("xf");
                 xw.WriteAttributeString("xfId", "0");
-                xw.WriteEndElement();
+                xw.WriteEndElement();   // <xf>
                 xw.WriteStartElement("xf");
                 xw.WriteAttributeString("numFmtId", "166");
                 xw.WriteAttributeString("xfId", "0");
                 xw.WriteAttributeString("applyNumberFormat", "1");
-                xw.WriteEndElement();
+                xw.WriteEndElement();   // <xf>
                 xw.WriteStartElement("xf");
                 xw.WriteAttributeString("numFmtId", "167");
                 xw.WriteAttributeString("xfId", "0");
                 xw.WriteAttributeString("applyNumberFormat", "1");
-                xw.WriteEndElement();
+                xw.WriteEndElement();   // <xf>
                 xw.WriteStartElement("xf");
                 xw.WriteAttributeString("numFmtId", "168");
                 xw.WriteAttributeString("xfId", "0");
                 xw.WriteAttributeString("applyNumberFormat", "1");
-                xw.WriteEndElement();
+                xw.WriteEndElement();   // <xf>
                 xw.WriteStartElement("xf");
                 xw.WriteAttributeString("numFmtId", "169");
                 xw.WriteAttributeString("xfId", "0");
                 xw.WriteAttributeString("applyNumberFormat", "1");
-                xw.WriteEndElement();
-                xw.WriteEndElement(); // cellXfs
+                xw.WriteEndElement();   // <xf>
+                xw.WriteStartElement("xf");
+                xw.WriteAttributeString("xfId", "0");
+                xw.WriteAttributeString("fontId", "1");
+                xw.WriteEndElement();   // <xf>
+                xw.WriteEndElement();   // <cellXfs>
 
                 xw.WriteStartElement("cellStyles");
                 xw.WriteAttributeString("count", "1");
@@ -802,8 +956,8 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
                 xw.WriteAttributeString("name", "Normal");
                 xw.WriteAttributeString("builtinId", "0");
                 xw.WriteAttributeString("xfId", "0");
-                xw.WriteEndElement(); // cellStyle
-                xw.WriteEndElement(); // cellStyles
+                xw.WriteEndElement();   // <cellStyle>
+                xw.WriteEndElement();   // <cellStyles>
             }
         }
     }

src/Microsoft.SqlTools.ServiceLayer/QueryExecution/DataStorage/SaveAsWriterBase.cs

@@ -85,6 +85,17 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
             throw new InvalidOperationException("This type of writer is meant to write values from a list of cell values only.");
         }
 
+        /// <summary>
+        /// Indicates whether columns should be measured based on whether the output format supports it and if the caller wants the columns automatically sized
+        /// </summary>
+        public virtual bool ShouldMeasureRowColumns => false;
+
+        /// <summary>
+        /// Measures the columns in a row of data as part of determining automatic column widths
+        /// </summary>
+        /// <param name="row">The row of data to measure</param>
+        public virtual void MeasureRowColumns(IList<DbCellValue> row) { }
+
         /// <summary>
         /// Writes a row of data to the output file using the format provided by the implementing class.
         /// </summary>

src/Microsoft.SqlTools.ServiceLayer/QueryExecution/ResultSet.cs

@@ -533,8 +533,30 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution
                     using (var fileReader = fileFactory.GetReader(outputFileName))
                     using (var fileWriter = fileFactory.GetWriter(saveParams.FilePath, Columns))
                     {
+                        DateTime recentLogTime;
+
+                        // Some writers (like Excel) require the column widths before any of the rows have been written so we need to loop over
+                        // all the rows of data in order to calculate what the column widths should be before the rows are actually written
+                        if (fileWriter is SaveAsStreamWriter { ShouldMeasureRowColumns: true } saveAsStreamWriter)
+                        {
+                            Logger.Verbose($"Started measuring {RowCount} rows");
+                            recentLogTime = DateTime.Now;
+                            // Iterate over the rows that are in the selected row set
+                            for (long i = rowStartIndex; i < rowEndIndex; ++i)
+                            {
+                                var row = fileReader.ReadRow(fileOffsets[i], i, Columns);
+                                saveAsStreamWriter.MeasureRowColumns(row);
+                                if (DateTime.Now.Subtract(recentLogTime).TotalSeconds > 1)
+                                {
+                                    Logger.Verbose($"Measure progress: {i - rowStartIndex + 1}/{RowCount}.");
+                                    recentLogTime = DateTime.Now;
+                                }
+                            }
+                            Logger.Verbose($"Measured {RowCount} rows");
+                        }
+
                         Logger.Verbose($"Started exporting {RowCount} rows to file: {outputFileName}");
-                        var recentLogTime = DateTime.Now;
+                        recentLogTime = DateTime.Now;
                         // Iterate over the rows that are in the selected row set
                         for (long i = rowStartIndex; i < rowEndIndex; ++i)
                         {

src/Microsoft.SqlTools.ServiceLayer/QueryExecution/SerializationService.cs

@@ -290,7 +290,11 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution
                 FilePath = this.requestParams.FilePath,
                 BatchIndex = 0,
                 ResultSetIndex = 0,
-                IncludeHeaders = this.requestParams.IncludeHeaders
+                IncludeHeaders = this.requestParams.IncludeHeaders,
+                FreezeHeaderRow = this.requestParams.FreezeHeaderRow,
+                BoldHeaderRow = this.requestParams.BoldHeaderRow,
+                AutoFilterHeaderRow = this.requestParams.AutoFilterHeaderRow,
+                AutoSizeColumns = this.requestParams.AutoSizeColumns
             };
         }
         private SaveResultsAsCsvRequestParams CreateCsvRequestParams()

test/Microsoft.SqlTools.ServiceLayer.Test.Common/TestData/DataStorage/SaveAsExcelFileStreamWriterHelperTests/xl/styles.xml

@@ -6,7 +6,7 @@
     <numFmt numFmtId="168" formatCode="yyyy-mm-dd hh:mm:ss" />
     <numFmt numFmtId="169" formatCode="[h]:mm:ss" />
   </numFmts>
-  <fonts count="1">
+  <fonts count="2">
     <font>
       <sz val="11" />
       <color theme="1" />
@@ -14,6 +14,14 @@
       <family val="2" />
       <scheme val="minor" />
     </font>
+    <font>
+      <b />
+      <sz val="11" />
+      <color theme="1" />
+      <name val="Calibri" />
+      <family val="2" />
+      <scheme val="minor" />
+    </font>
   </fonts>
   <fills count="1">
     <fill>
@@ -32,12 +40,13 @@
   <cellStyleXfs count="1">
     <xf numFmtId="0" fontId="0" fillId="0" borderId="0" />
   </cellStyleXfs>
-  <cellXfs count="5">
+  <cellXfs count="6">
     <xf xfId="0" />
     <xf numFmtId="166" xfId="0" applyNumberFormat="1" />
     <xf numFmtId="167" xfId="0" applyNumberFormat="1" />
     <xf numFmtId="168" xfId="0" applyNumberFormat="1" />
     <xf numFmtId="169" xfId="0" applyNumberFormat="1" />
+	<xf xfId="0" fontId="1" />
   </cellXfs>
   <cellStyles count="1">
     <cellStyle name="Normal" builtinId="0" xfId="0" />

test/Microsoft.SqlTools.ServiceLayer.Test.Common/TestData/DataStorage/SaveAsExcelFileStreamWriterHelperTests/xl/worksheets/sheet1-autoFilterEnabled.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<worksheet xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">
+  <sheetData>
+    <row r="1">
+      <c r="B1" t="inlineStr"><is><t></t></is></c>
+      <c r="C1" t="inlineStr"><is><t>test string</t></is></c>
+      <c r="D1"><v>3</v></c>
+      <c r="E1"><v>3.5</v></c>
+      <c r="F1" t="b"><v>0</v></c>
+      <c r="G1" t="b"><v>1</v></c>
+    </row>
+    <row r="2">
+      <c r="A2" t="inlineStr"><is><t>1900-02-28</t></is></c>
+      <c r="B2" s="1"><v>61</v></c>
+      <c r="C2" s="3"><v>61.625</v></c>
+      <c r="D2" s="2"><v>0.625</v></c>
+      <c r="E2" s="2"><v>0.625</v></c>
+      <c r="F2" s="4"><v>1</v></c>
+    </row>
+  </sheetData>
+  <autoFilter ref="A1:G1" />
+</worksheet>

test/Microsoft.SqlTools.ServiceLayer.Test.Common/TestData/DataStorage/SaveAsExcelFileStreamWriterHelperTests/xl/worksheets/sheet1-headerRowBold.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<worksheet xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">
+  <sheetData>
+    <row r="1">
+      <c r="B1" t="inlineStr"><is><t></t></is></c>
+      <c r="C1" t="inlineStr"><is><t>test string</t></is></c>
+      <c r="D1"><v>3</v></c>
+      <c r="E1"><v>3.5</v></c>
+      <c r="F1" t="b"><v>0</v></c>
+      <c r="G1" t="b"><v>1</v></c>
+    </row>
+    <row r="2">
+      <c r="A2" t="inlineStr"><is><t>1900-02-28</t></is></c>
+      <c r="B2" s="1"><v>61</v></c>
+      <c r="C2" s="3"><v>61.625</v></c>
+      <c r="D2" s="2"><v>0.625</v></c>
+      <c r="E2" s="2"><v>0.625</v></c>
+      <c r="F2" s="4"><v>1</v></c>
+    </row>
+  </sheetData>
+</worksheet>

test/Microsoft.SqlTools.ServiceLayer.Test.Common/TestData/DataStorage/SaveAsExcelFileStreamWriterHelperTests/xl/worksheets/sheet1-headerRowFrozen.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<worksheet xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">
+  <sheetViews>
+	<sheetView tabSelected="1" workbookViewId="0">
+	  <pane ySplit="1" topLeftCell="A2" activePane="bottomLeft" state="frozen" />
+	  <selection pane="bottomLeft" />
+	</sheetView>
+  </sheetViews>
+  <sheetData>
+    <row r="1">
+      <c r="B1" t="inlineStr"><is><t></t></is></c>
+      <c r="C1" t="inlineStr"><is><t>test string</t></is></c>
+      <c r="D1"><v>3</v></c>
+      <c r="E1"><v>3.5</v></c>
+      <c r="F1" t="b"><v>0</v></c>
+      <c r="G1" t="b"><v>1</v></c>
+    </row>
+    <row r="2">
+      <c r="A2" t="inlineStr"><is><t>1900-02-28</t></is></c>
+      <c r="B2" s="1"><v>61</v></c>
+      <c r="C2" s="3"><v>61.625</v></c>
+      <c r="D2" s="2"><v>0.625</v></c>
+      <c r="E2" s="2"><v>0.625</v></c>
+      <c r="F2" s="4"><v>1</v></c>
+    </row>
+  </sheetData>
+</worksheet>

test/Microsoft.SqlTools.ServiceLayer.Test.Common/TestData/DataStorage/SaveAsExcelFileStreamWriterHelperTests/xl/worksheets/sheet1-withColumns.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<worksheet xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">
+  <cols>
+    <col min="1" max="1" width="2.28515625" bestFit="1" customWidth="1" />
+    <col min="2" max="2" width="2.42578125" bestFit="1" customWidth="1" />
+    <col min="3" max="3" width="2.5703125" bestFit="1" customWidth="1" />
+    <col min="4" max="4" width="2.7109375" bestFit="1" customWidth="1" />
+    <col min="5" max="5" width="2.85546875" bestFit="1" customWidth="1" />
+    <col min="6" max="6" width="3" bestFit="1" customWidth="1" />
+    <col min="7" max="7" width="3.140625" bestFit="1" customWidth="1" />
+  </cols>
+  <sheetData>
+    <row r="1">
+      <c r="B1" t="inlineStr"><is><t></t></is></c>
+      <c r="C1" t="inlineStr"><is><t>test string</t></is></c>
+      <c r="D1"><v>3</v></c>
+      <c r="E1"><v>3.5</v></c>
+      <c r="F1" t="b"><v>0</v></c>
+      <c r="G1" t="b"><v>1</v></c>
+    </row>
+    <row r="2">
+      <c r="A2" t="inlineStr"><is><t>1900-02-28</t></is></c>
+      <c r="B2" s="1"><v>61</v></c>
+      <c r="C2" s="3"><v>61.625</v></c>
+      <c r="D2" s="2"><v>0.625</v></c>
+      <c r="E2" s="2"><v>0.625</v></c>
+      <c r="F2" s="4"><v>1</v></c>
+    </row>
+  </sheetData>
+</worksheet>

test/Microsoft.SqlTools.ServiceLayer.UnitTests/QueryExecution/DataStorage/SaveAsExcelFileStreamWriterHelperTests.cs

@@ -16,14 +16,14 @@ using NUnit.Framework;
 
 namespace Microsoft.SqlTools.ServiceLayer.UnitTests.QueryExecution.DataStorage
 {
-    public partial class SaveAsExcelFileStreamWriterHelperTests : IDisposable
+    public partial class SaveAsExcelFileStreamWriterHelperTests
     {
-        private Stream _stream;
-        public SaveAsExcelFileStreamWriterHelperTests()
+        [Test]
+        public void DefaultSheet()
         {
-            _stream = new MemoryStream();
-            using (var helper = new SaveAsExcelFileStreamWriterHelper(_stream, true))
-            using (var sheet = helper.AddSheet())
+            var stream = new MemoryStream();
+            using (var helper = new SaveAsExcelFileStreamWriterHelper(stream, true))
+            using (var sheet = helper.AddSheet(null, 7))
             {
                 var value = new DbCellValue();
                 sheet.AddRow();
@@ -70,64 +70,431 @@ namespace Microsoft.SqlTools.ServiceLayer.UnitTests.QueryExecution.DataStorage
                 value.RawObject = new TimeSpan(24, 00, 00);
                 sheet.AddCell(value);
             }
+
+            ContentMatch(stream, "[Content_Types].xml");
+            ContentMatch(stream, "_rels/.rels");
+            ContentMatch(stream, "xl/_rels/workbook.xml.rels");
+            ContentMatch(stream, "xl/styles.xml");
+            ContentMatch(stream, "xl/workbook.xml");
+            ContentMatch(stream, "xl/worksheets/sheet1.xml");
+
+            stream.Dispose();
         }
-        
+
+        [Test]
+        public void SheetWithFrozenHeaderRow()
+        {
+            var stream = new MemoryStream();
+            using (var helper = new SaveAsExcelFileStreamWriterHelper(stream, true))
+            using (var sheet = helper.AddSheet(null, 7))
+            {
+                sheet.FreezeHeaderRow();
+
+                var value = new DbCellValue();
+                sheet.AddRow();
+
+                value.IsNull = true;
+                sheet.AddCell(value);
+
+                value.IsNull = false;
+                value.RawObject = "";
+                sheet.AddCell(value);
+
+                value.RawObject = "test string";
+                sheet.AddCell(value);
+
+                value.RawObject = 3;
+                sheet.AddCell(value);
+
+                value.RawObject = 3.5;
+                sheet.AddCell(value);
+
+                value.RawObject = false;
+                sheet.AddCell(value);
+
+                value.RawObject = true;
+                sheet.AddCell(value);
+
+                sheet.AddRow();
+
+                value.RawObject = new DateTime(1900, 2, 28);
+                sheet.AddCell(value);
+
+                value.RawObject = new DateTime(1900, 3, 1);
+                sheet.AddCell(value);
+
+                value.RawObject = new DateTime(1900, 3, 1, 15, 00, 00);
+                sheet.AddCell(value);
+
+                value.RawObject = new DateTime(1, 1, 1, 15, 00, 00);
+                sheet.AddCell(value);
+
+                value.RawObject = new TimeSpan(15, 00, 00);
+                sheet.AddCell(value);
+
+                value.RawObject = new TimeSpan(24, 00, 00);
+                sheet.AddCell(value);
+            }
+
+            ContentMatch(stream, "[Content_Types].xml");
+            ContentMatch(stream, "_rels/.rels");
+            ContentMatch(stream, "xl/_rels/workbook.xml.rels");
+            ContentMatch(stream, "xl/styles.xml");
+            ContentMatch(stream, "xl/workbook.xml");
+            ContentMatch(stream, "xl/worksheets/sheet1.xml", "xl/worksheets/sheet1-headerRowFrozen.xml");
+
+            stream.Dispose();
+        }
+
+        [Test]
+        public void SheetWithFrozenHeaderRowCalledTooLate()
+        {
+            var expectedException = new InvalidOperationException("Must be called before calling AddRow");
+            var actualException = new Exception();
+            var stream = new MemoryStream();
+            using (var helper = new SaveAsExcelFileStreamWriterHelper(stream, true))
+            using (var sheet = helper.AddSheet(null, 7))
+            {
+                sheet.AddRow();
+
+                try
+                {
+                    sheet.FreezeHeaderRow();
+
+                    Assert.Fail("Did not throw an exception when calling FreezeHeaderRow too late");
+                }
+                catch (Exception e)
+                {
+                    actualException = e;
+                }
+            }
+
+            Assert.AreEqual(expectedException.GetType(), actualException.GetType());
+            Assert.AreEqual(expectedException.Message, actualException.Message);
+
+            stream.Dispose();
+        }
+
+        [Test]
+        public void SheetWithBoldHeaderRow()
+        {
+            var stream = new MemoryStream();
+            using (var helper = new SaveAsExcelFileStreamWriterHelper(stream, true))
+            using (var sheet = helper.AddSheet(null, 7))
+            {
+                var value = new DbCellValue();
+                sheet.AddRow();
+
+                value.IsNull = true;
+                sheet.AddCell(value);
+
+                value.IsNull = false;
+                value.RawObject = "";
+                sheet.AddCell(value);
+
+                value.RawObject = "test string";
+                sheet.AddCell(value);
+
+                value.RawObject = 3;
+                sheet.AddCell(value);
+
+                value.RawObject = 3.5;
+                sheet.AddCell(value);
+
+                value.RawObject = false;
+                sheet.AddCell(value);
+
+                value.RawObject = true;
+                sheet.AddCell(value);
+
+                sheet.AddRow();
+
+                value.RawObject = new DateTime(1900, 2, 28);
+                sheet.AddCell(value);
+
+                value.RawObject = new DateTime(1900, 3, 1);
+                sheet.AddCell(value);
+
+                value.RawObject = new DateTime(1900, 3, 1, 15, 00, 00);
+                sheet.AddCell(value);
+
+                value.RawObject = new DateTime(1, 1, 1, 15, 00, 00);
+                sheet.AddCell(value);
+
+                value.RawObject = new TimeSpan(15, 00, 00);
+                sheet.AddCell(value);
+
+                value.RawObject = new TimeSpan(24, 00, 00);
+                sheet.AddCell(value);
+            }
+
+            ContentMatch(stream, "[Content_Types].xml");
+            ContentMatch(stream, "_rels/.rels");
+            ContentMatch(stream, "xl/_rels/workbook.xml.rels");
+            ContentMatch(stream, "xl/styles.xml");
+            ContentMatch(stream, "xl/workbook.xml");
+            ContentMatch(stream, "xl/worksheets/sheet1.xml", "xl/worksheets/sheet1-headerRowBold.xml");
+
+            stream.Dispose();
+        }
+
+        [Test]
+        public void SheetWithAutoFilterEnabled()
+        {
+            var stream = new MemoryStream();
+            using (var helper = new SaveAsExcelFileStreamWriterHelper(stream, true))
+            using (var sheet = helper.AddSheet(null, 7))
+            {
+                sheet.EnableAutoFilter();
+
+                var value = new DbCellValue();
+                sheet.AddRow();
+
+                value.IsNull = true;
+                sheet.AddCell(value);
+
+                value.IsNull = false;
+                value.RawObject = "";
+                sheet.AddCell(value);
+
+                value.RawObject = "test string";
+                sheet.AddCell(value);
+
+                value.RawObject = 3;
+                sheet.AddCell(value);
+
+                value.RawObject = 3.5;
+                sheet.AddCell(value);
+
+                value.RawObject = false;
+                sheet.AddCell(value);
+
+                value.RawObject = true;
+                sheet.AddCell(value);
+
+                sheet.AddRow();
+
+                value.RawObject = new DateTime(1900, 2, 28);
+                sheet.AddCell(value);
+
+                value.RawObject = new DateTime(1900, 3, 1);
+                sheet.AddCell(value);
+
+                value.RawObject = new DateTime(1900, 3, 1, 15, 00, 00);
+                sheet.AddCell(value);
+
+                value.RawObject = new DateTime(1, 1, 1, 15, 00, 00);
+                sheet.AddCell(value);
+
+                value.RawObject = new TimeSpan(15, 00, 00);
+                sheet.AddCell(value);
+
+                value.RawObject = new TimeSpan(24, 00, 00);
+                sheet.AddCell(value);
+            }
+
+            ContentMatch(stream, "[Content_Types].xml");
+            ContentMatch(stream, "_rels/.rels");
+            ContentMatch(stream, "xl/_rels/workbook.xml.rels");
+            ContentMatch(stream, "xl/styles.xml");
+            ContentMatch(stream, "xl/workbook.xml");
+            ContentMatch(stream, "xl/worksheets/sheet1.xml", "xl/worksheets/sheet1-autoFilterEnabled.xml");
+
+            stream.Dispose();
+        }
+
+        [Test]
+        public void SheetWriteColumnInformationCalledTooLate()
+        {
+            var expectedException = new InvalidOperationException("Must be called before calling AddRow");
+            var actualException = new Exception();
+            var stream = new MemoryStream();
+            using (var helper = new SaveAsExcelFileStreamWriterHelper(stream, true))
+            using (var sheet = helper.AddSheet(null, 7))
+            {
+                sheet.AddRow();
+
+                try
+                {
+                    sheet.WriteColumnInformation(new []{ 1F, 2F, 3F, 4F, 5F, 6F, 7F });
+
+                    Assert.Fail("Did not throw an exception when calling WriteColumnInformation too late");
+                }
+                catch (Exception e)
+                {
+                    actualException = e;
+                }
+            }
+
+            Assert.AreEqual(expectedException.GetType(), actualException.GetType());
+            Assert.AreEqual(expectedException.Message, actualException.Message);
+
+            stream.Dispose();
+        }
+
+        [Test]
+        public void SheetWriteColumnInformationWithWrongAmount()
+        {
+            var expectedException = new InvalidOperationException("Column count mismatch");
+            var actualException = new Exception();
+            var stream = new MemoryStream();
+            using (var helper = new SaveAsExcelFileStreamWriterHelper(stream, true))
+            using (var sheet = helper.AddSheet(null, 7))
+            {
+                try
+                {
+                    sheet.WriteColumnInformation(new[] { 1F, 2F, 3F, 4F, 5F });
+
+                    Assert.Fail("Did not throw an exception when calling WriteColumnInformation with the wrong number of columns");
+                }
+                catch (Exception e)
+                {
+                    actualException = e;
+                }
+
+                var value = new DbCellValue();
+                sheet.AddRow();
+
+                value.IsNull = true;
+                sheet.AddCell(value);
+
+                value.IsNull = false;
+                value.RawObject = "";
+                sheet.AddCell(value);
+
+                value.RawObject = "test string";
+                sheet.AddCell(value);
+
+                value.RawObject = 3;
+                sheet.AddCell(value);
+
+                value.RawObject = 3.5;
+                sheet.AddCell(value);
+
+                value.RawObject = false;
+                sheet.AddCell(value);
+
+                value.RawObject = true;
+                sheet.AddCell(value);
+
+                sheet.AddRow();
+
+                value.RawObject = new DateTime(1900, 2, 28);
+                sheet.AddCell(value);
+
+                value.RawObject = new DateTime(1900, 3, 1);
+                sheet.AddCell(value);
+
+                value.RawObject = new DateTime(1900, 3, 1, 15, 00, 00);
+                sheet.AddCell(value);
+
+                value.RawObject = new DateTime(1, 1, 1, 15, 00, 00);
+                sheet.AddCell(value);
+
+                value.RawObject = new TimeSpan(15, 00, 00);
+                sheet.AddCell(value);
+
+                value.RawObject = new TimeSpan(24, 00, 00);
+                sheet.AddCell(value);
+            }
+
+            Assert.AreEqual(expectedException.GetType(), actualException.GetType());
+            Assert.AreEqual(expectedException.Message, actualException.Message);
+
+            stream.Dispose();
+        }
+
+        [Test]
+        public void SheetWriteColumnInformation()
+        {
+            var stream = new MemoryStream();
+            using (var helper = new SaveAsExcelFileStreamWriterHelper(stream, true))
+            using (var sheet = helper.AddSheet(null, 7))
+            {
+                sheet.WriteColumnInformation(new[] { 1F, 2F, 3F, 4F, 5F, 6F, 7F });
+
+                var value = new DbCellValue();
+                sheet.AddRow();
+
+                value.IsNull = true;
+                sheet.AddCell(value);
+
+                value.IsNull = false;
+                value.RawObject = "";
+                sheet.AddCell(value);
+
+                value.RawObject = "test string";
+                sheet.AddCell(value);
+
+                value.RawObject = 3;
+                sheet.AddCell(value);
+
+                value.RawObject = 3.5;
+                sheet.AddCell(value);
+
+                value.RawObject = false;
+                sheet.AddCell(value);
+
+                value.RawObject = true;
+                sheet.AddCell(value);
+
+                sheet.AddRow();
+
+                value.RawObject = new DateTime(1900, 2, 28);
+                sheet.AddCell(value);
+
+                value.RawObject = new DateTime(1900, 3, 1);
+                sheet.AddCell(value);
+
+                value.RawObject = new DateTime(1900, 3, 1, 15, 00, 00);
+                sheet.AddCell(value);
+
+                value.RawObject = new DateTime(1, 1, 1, 15, 00, 00);
+                sheet.AddCell(value);
+
+                value.RawObject = new TimeSpan(15, 00, 00);
+                sheet.AddCell(value);
+
+                value.RawObject = new TimeSpan(24, 00, 00);
+                sheet.AddCell(value);
+            }
+
+            ContentMatch(stream, "[Content_Types].xml");
+            ContentMatch(stream, "_rels/.rels");
+            ContentMatch(stream, "xl/_rels/workbook.xml.rels");
+            ContentMatch(stream, "xl/styles.xml");
+            ContentMatch(stream, "xl/workbook.xml");
+            ContentMatch(stream, "xl/worksheets/sheet1.xml", "xl/worksheets/sheet1-withColumns.xml");
+
+            stream.Dispose();
+        }
+
         [GeneratedRegex("\\r?\\n\\s*")]
         private static partial Regex GetContentRemoveLinebreakLeadingSpaceRegex();
 
-        private void ContentMatch(string fileName)
+        private void ContentMatch(Stream stream, string fileName)
+        {
+            ContentMatch(stream, fileName, fileName);
+        }
+
+        private void ContentMatch(Stream stream, string realFileName, string referenceFileName)
         {
             string referencePath = Path.Combine(RunEnvironmentInfo.GetTestDataLocation(),
                 "DataStorage",
                 "SaveAsExcelFileStreamWriterHelperTests",
-                fileName);
+                referenceFileName);
             string referenceContent = File.ReadAllText(referencePath);
             referenceContent = GetContentRemoveLinebreakLeadingSpaceRegex().Replace(referenceContent, "");
 
-            using (var zip = new ZipArchive(_stream, ZipArchiveMode.Read, true))
+            using (var zip = new ZipArchive(stream, ZipArchiveMode.Read, true))
             {
-                using (var reader = new StreamReader(zip?.GetEntry(fileName)?.Open()!))
+                using (var reader = new StreamReader(zip?.GetEntry(realFileName)?.Open()!))
                 {
                     string realContent = reader.ReadToEnd();
                     Assert.AreEqual(referenceContent, realContent);
                 }
             }
         }
-        [Test]
-        public void CheckContentType()
-        {
-            ContentMatch("[Content_Types].xml");
-        }
-        [Test]
-        public void CheckTopRels()
-        {
-            ContentMatch("_rels/.rels");
-        }
-        [Test]
-        public void CheckWorkbookRels()
-        {
-            ContentMatch("xl/_rels/workbook.xml.rels");
-        }
-        [Test]
-        public void CheckStyles()
-        {
-            ContentMatch("xl/styles.xml");
-        }
-        [Test]
-        public void CheckWorkbook()
-        {
-            ContentMatch("xl/workbook.xml");
-        }
-        [Test]
-        public void CheckSheet1()
-        {
-            ContentMatch("xl/worksheets/sheet1.xml");
-        }
-
-        public void Dispose()
-        {
-            _stream.Dispose();
-        }
     }
 
     public class SaveAsExcelFileStreamWriterHelperReferenceManagerTests