Add update checking

Common.csproj

@@ -141,6 +141,7 @@
     <Reference Include="System.Windows.Forms" />
     <Reference Include="System.Xaml" />
     <Reference Include="System.XML" />
+    <Reference Include="System.Xml.Linq" />
     <Reference Include="WindowsBase" />
   </ItemGroup>
   <ItemGroup>
@@ -162,6 +163,8 @@
     <Compile Include="Trace\Tracer.cs" />
     <Compile Include="Settings\Extensions.cs" />
     <Compile Include="Settings\GenericSettingsProvider.cs" />
+    <Compile Include="Update\UpdateCheck.cs" />
+    <Compile Include="Update\VersionInfo.cs" />
     <Compile Include="Xml\XmlExtensions.cs" />
     <AppDesigner Include="Properties\" />
     <Compile Include="Xml\XmlSanitizingStream.cs" />

Update/UpdateCheck.cs

@@ -0,0 +1,66 @@
+using System;
+using System.Diagnostics;
+using System.IO;
+using System.Net;
+using System.Reflection;
+using System.Threading.Tasks;
+
+namespace Common.Update
+{
+    public static class UpdateCheck
+    {
+        private static string _server;
+
+        public static VersionInfo VersionInfo { get; private set; }
+        public static string LocalInstallFile { get; private set; }
+        public static bool UpdateAvailable { get; private set; }
+
+        public static Version CurrentVersion
+        {
+            get { return Assembly.GetExecutingAssembly().GetName().Version; }
+        }
+
+        public static bool CheckForUpdate(string server, string file)
+        {
+            _server = server;
+
+            VersionInfo = VersionInfo.Load(_server, file);
+
+            if (VersionInfo == null)
+                return false;
+
+            var serverVersion = VersionInfo.Version;
+            var localVersion = CurrentVersion;
+
+            UpdateAvailable = serverVersion > localVersion;
+
+            return true;
+        }
+
+        public static async Task<bool> DownloadUpdate()
+        {
+            if (VersionInfo == null)
+                return false;
+
+            var remoteFile = _server + VersionInfo.InstallFile;
+
+            LocalInstallFile = Path.Combine(Path.GetTempPath(), VersionInfo.InstallFile);
+
+            var webClient = new WebClient();
+
+            await webClient.DownloadFileTaskAsync(new Uri(remoteFile), LocalInstallFile);
+
+            return true;
+        }
+
+        public static bool InstallUpdate()
+        {
+            if (VersionInfo == null)
+                return false;
+
+            Process.Start(LocalInstallFile, "/passive");
+
+            return true;
+        }
+    }
+}

Update/VersionInfo.cs

@@ -0,0 +1,48 @@
+using Common.Debug;
+using System;
+using System.Xml.Linq;
+
+namespace Common.Update
+{
+    public class VersionInfo
+    {
+        public Version Version { get; set; }
+        public string InstallFile { get; set; }
+        public DateTime InstallCreated { get; set; }
+
+        public static VersionInfo Load(string server, string file)
+        {
+            try
+            {
+                var document = XDocument.Load(server + file);
+
+                var versionInformationElement = document.Element("versionInformation");
+
+                if (versionInformationElement == null)
+                    return null;
+
+                var versionElement = versionInformationElement.Element("version");
+                var installFileElement = versionInformationElement.Element("installFile");
+                var installCreatedElement = versionInformationElement.Element("installCreated");
+
+                if (versionElement == null || installFileElement == null || installCreatedElement == null)
+                    return null;
+
+                var versionInfo = new VersionInfo
+                {
+                    Version = Version.Parse(versionElement.Value),
+                    InstallFile = installFileElement.Value,
+                    InstallCreated = DateTime.Parse(installCreatedElement.Value)
+                };
+
+                return versionInfo;
+            }
+            catch (Exception exception)
+            {
+                Tracer.WriteException(exception);
+
+                return null;
+            }
+        }
+    }
+}