封装：Windows系统文件图标

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用途：用于获取文件系统默认图标

using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;namespace HebianGu.ComLibModule.API
{/// <summary> 获取文件关联图标 </summary>public partial class IconHelper{/// <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);/// <summary> 获取文件图标 </summary>  public 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>  public 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;}/// <summary> 获取系统图标 </summary>  public Icon GetSystemInfoIcon(string p_Path){if (Path.HasExtension(p_Path)){try{return Icon.ExtractAssociatedIcon(p_Path);}catch{return null;}}else{return this.GetDirectoryIcon();}}}partial class IconHelper{#region - Start 单例模式 -/// <summary> 单例模式 </summary>private static IconHelper t = null;/// <summary> 多线程锁 </summary>private static object localLock = new object();/// <summary> 创建指定对象的单例实例 </summary>public static IconHelper Instance{get{if (t == null){lock (localLock){if (t == null)return t = new IconHelper();}}return t;}}/// <summary> 禁止外部实例 </summary>private IconHelper(){}#endregion - 单例模式 End -}[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;}public enum SHGFI{SHGFI_ICON = 0x100,SHGFI_LARGEICON = 0x0,SHGFI_USEFILEATTRIBUTES = 0x10}
}

应用示例：

        /// <summary> 图片路径 </summary>public Icon ImagePath{get { return IconHelper.Instance.GetSystemInfoIcon(FilePath); }}

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