C#           var icon = System.Drawing.Icon.ExtractAssociatedIcon(@"filepath");            var m = new MemoryStream();            icon.Save(m);            var bitmapiamge = new BitmapImage();            bitmapiamge.BeginInit();            bitmapiamge.StreamSource = m;            bitmapiamge.EndInit();            this.Icon = bitmapiamge;

public class IconExt{    [StructLayout(LayoutKind.Sequential)]    public struct SHFILEINFO    {        public IntPtr hIcon;        public IntPtr iIcon;        public uint dwAttributes;        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]        public string szDisplayName;        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]        public string szTypeName;    }    /// <summary>      /// 返回系统设置的图标      /// </summary>      /// <param name="pszPath">文件路径 如果为""  返回文件夹的</param>      /// <param name="dwFileAttributes">0</param>      /// <param name="psfi">结构体</param>      /// <param name="cbSizeFileInfo">结构体大小</param>      /// <param name="uFlags">枚举类型</param>      /// <returns>-1失败</returns>      [DllImport("shell32.dll")]    public static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref   SHFILEINFO psfi, uint cbSizeFileInfo, uint uFlags);    public enum SHGFI    {        SHGFI_ICON = 0x100,        SHGFI_LARGEICON = 0x0,        SHGFI_USEFILEATTRIBUTES = 0x10    }    /// <summary>      /// 获取文件图标     /// </summary>      /// <param name="p_Path">文件全路径</param>      /// <returns>图标</returns>      public static System.Drawing.Icon GetFileIcon(string p_Path)    {        SHFILEINFO _SHFILEINFO = new SHFILEINFO();        IntPtr _IconIntPtr = SHGetFileInfo(p_Path, 0, ref _SHFILEINFO, (uint)Marshal.SizeOf(_SHFILEINFO), (uint)(SHGFI.SHGFI_ICON | SHGFI.SHGFI_LARGEICON | SHGFI.SHGFI_USEFILEATTRIBUTES));        if (_IconIntPtr.Equals(IntPtr.Zero)) return null;        System.Drawing.Icon _Icon = System.Drawing.Icon.FromHandle(_SHFILEINFO.hIcon);        return _Icon;    }    /// <summary>      /// 获取文件夹图标     /// </summary>      /// <returns>图标</returns>      public static System.Drawing.Icon GetDirectoryIcon()    {        SHFILEINFO _SHFILEINFO = new SHFILEINFO();        IntPtr _IconIntPtr = SHGetFileInfo(@"", 0, ref _SHFILEINFO, (uint)Marshal.SizeOf(_SHFILEINFO), (uint)(SHGFI.SHGFI_ICON | SHGFI.SHGFI_LARGEICON));        if (_IconIntPtr.Equals(IntPtr.Zero)) return null;        System.Drawing.Icon _Icon = System.Drawing.Icon.FromHandle(_SHFILEINFO.hIcon);        return _Icon;    }}