How do I display a Windows file icon in WPF?

How about something like:

var icon = System.Drawing.Icon.ExtractAssociatedIcon(fileName);var bmp = icon.ToBitmap()

using System.Windows.Interop;...ImageSource img = Imaging.CreateBitmapSourceFromHIcon(    shinfo.hIcon,    new Int32Rect(0,0,i.Width, i.Height),    BitmapSizeOptions.FromEmptyOptions());

Combining Krzysztof Kowalczyk answer with some googling, i made up this:

Method:

/*using System;using System.Runtime.InteropServices;using System.Windows;using System.Windows.Interop;using System.Windows.Media;using System.Windows.Media.Imaging;*/     public static ImageSource GetIcon(string strPath, bool bSmall)        {          Interop.SHFILEINFO info = new Interop.SHFILEINFO(true);          int cbFileInfo = Marshal.SizeOf(info);          Interop.SHGFI flags;          if (bSmall)            flags = Interop.SHGFI.Icon | Interop.SHGFI.SmallIcon | Interop.SHGFI.UseFileAttributes;          else            flags = Interop.SHGFI.Icon | Interop.SHGFI.LargeIcon | Interop.SHGFI.UseFileAttributes;          Interop.SHGetFileInfo(strPath, 256, out info, (uint)cbFileInfo, flags);          IntPtr iconHandle = info.hIcon;          //if (IntPtr.Zero == iconHandle) // not needed, always return icon (blank)          //  return DefaultImgSrc;          ImageSource img = Imaging.CreateBitmapSourceFromHIcon(                      iconHandle,                      Int32Rect.Empty,                      BitmapSizeOptions.FromEmptyOptions());          Interop.DestroyIcon(iconHandle);          return img;        }

and Interop class:

using System;using System.Runtime.InteropServices;public static class Interop  {    /// <summary>Maximal Length of unmanaged Windows-Path-strings</summary>    private const int MAX_PATH = 260;    /// <summary>Maximal Length of unmanaged Typename</summary>    private const int MAX_TYPE = 80;    [Flags]    public enum SHGFI : int    {      /// <summary>get icon</summary>      Icon = 0x000000100,      /// <summary>get display name</summary>      DisplayName = 0x000000200,      /// <summary>get type name</summary>      TypeName = 0x000000400,      /// <summary>get attributes</summary>      Attributes = 0x000000800,      /// <summary>get icon location</summary>      IconLocation = 0x000001000,      /// <summary>return exe type</summary>      ExeType = 0x000002000,      /// <summary>get system icon index</summary>      SysIconIndex = 0x000004000,      /// <summary>put a link overlay on icon</summary>      LinkOverlay = 0x000008000,      /// <summary>show icon in selected state</summary>      Selected = 0x000010000,      /// <summary>get only specified attributes</summary>      Attr_Specified = 0x000020000,      /// <summary>get large icon</summary>      LargeIcon = 0x000000000,      /// <summary>get small icon</summary>      SmallIcon = 0x000000001,      /// <summary>get open icon</summary>      OpenIcon = 0x000000002,      /// <summary>get shell size icon</summary>      ShellIconSize = 0x000000004,      /// <summary>pszPath is a pidl</summary>      PIDL = 0x000000008,      /// <summary>use passed dwFileAttribute</summary>      UseFileAttributes = 0x000000010,      /// <summary>apply the appropriate overlays</summary>      AddOverlays = 0x000000020,      /// <summary>Get the index of the overlay in the upper 8 bits of the iIcon</summary>      OverlayIndex = 0x000000040,    }    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]    public struct SHFILEINFO    {      public SHFILEINFO(bool b)      {        hIcon = IntPtr.Zero;        iIcon = 0;        dwAttributes = 0;        szDisplayName = "";        szTypeName = "";      }      public IntPtr hIcon;      public int iIcon;      public uint dwAttributes;      [MarshalAs(UnmanagedType.ByValTStr, SizeConst = MAX_PATH)]      public string szDisplayName;      [MarshalAs(UnmanagedType.ByValTStr, SizeConst = MAX_TYPE)]      public string szTypeName;    };    [DllImport("shell32.dll", CharSet = CharSet.Auto)]    public static extern int SHGetFileInfo(      string pszPath,      int dwFileAttributes,      out    SHFILEINFO psfi,      uint cbfileInfo,      SHGFI uFlags);    [DllImport("user32.dll", SetLastError = true)]    public static extern bool DestroyIcon(IntPtr hIcon);  }

source