C# 获取系统文件图标

获取文件的图标

 this.Icon = GetFileIcon(@"c:\gdiplus.dll");

获取文件夹图标

 this.Icon = GetDirectoryIcon();    

全不代码

[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 zgke@sina.com qq:116149  
    /// </summary>  
    /// <param name="p_Path">文件全路径</param>  
    /// <returns>图标</returns>  
    public static 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;  
        Icon _Icon = System.Drawing.Icon.FromHandle(_SHFILEINFO.hIcon);  
        return _Icon;  
    }  
    /// <summary>  
    /// 获取文件夹图标  zgke@sina.com qq:116149  
    /// </summary>  
    /// <returns>图标</returns>  
    public static 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;  
        Icon _Icon = System.Drawing.Icon.FromHandle(_SHFILEINFO.hIcon);  
        return _Icon;  
    }