WPF 获取指定文件的Icon

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;

 

shell32.dll

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;

    }

}

shell32.dll 代码来自:http://www.cnblogs.com/jxsoft/archive/2011/06/22/2087440.html

网友的文章：http://blog.csdn.net/soft2buy/article/details/6979351