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【Asp.NET】获取文件图标，返回Icon

作者:合营 / 发布于2016/7/28/ 562

class FileIcon  
    {  
        [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_USEFILEATTRIBUTES = 0x10,  
            SHGFI_DISPLAYNAME = 0x200,  // Gets the Display name  
            SHGFI_TYPENAME = 0x400,     // Gets the type name  
            SHGFI_LARGEICON = 0x0,     // Large icon  
            SHGFI_SMALLICON = 0x1      // Small icon  
        }  
  
        /// <summary>  
        /// 获取文件图标  
        /// </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   
        /// </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;  
        }  
  
    }

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