Common.Wpf/Extensions/IconExtensions.cs

using System;
using System.ComponentModel;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;
using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace Common.Wpf.Extensions
{
    public static class IconExtensions
    {
        [DllImport("gdi32.dll", SetLastError = true)]
        private static extern bool DeleteObject(IntPtr hObject);

        public static ImageSource ToImageSource(this Icon icon)
        {
            var bitmap = icon.ToBitmap();
            var hBitmap = bitmap.GetHbitmap();

            ImageSource wpfBitmap = Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());

            if (!DeleteObject(hBitmap))
                throw new Win32Exception();

            return wpfBitmap;
        }
    }
}