这个类的主要内容是从「微软帮助和支持」中找到的,经过测试可行。
 说明:
  - 作用是获取传入文件的图标;
- 传入参数要求是包括路径的文件名;
- 返回的是图标类型,经过测试,这个Icon是可以直接当Image来使用的;
 
 代码:
 
 using System;
using System.Drawing;
using System.Runtime.InteropServices;
namespace csdemo.basic.Other
{
    public class GetSystemIcon
    {
        public Icon Get(string fileName)
        {
            IntPtr hImgSmall;
            SHFILEINFO shinfo = new SHFILEINFO();
            hImgSmall = Win32.SHGetFileInfo(fileName, 0, ref shinfo, (uint)Marshal.SizeOf(shinfo), Win32.SHGFI_ICON | Win32.SHGFI_SMALLICON);
            Icon fileIcon = Icon.FromHandle(shinfo.hIcon);
            return 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;
    };
    class Win32
    {
        public const uint SHGFI_ICON = 0x100;
        public const uint SHGFI_LARGEICON = 0x0; // 'Large icon
        public const uint SHGFI_SMALLICON = 0x1; // 'Small icon
        [DllImport("shell32.dll")]
        public static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbSizeFileInfo, uint uFlags);
    }
}
using System;
using System.Drawing;
using System.Runtime.InteropServices;
namespace csdemo.basic.Other
{
    public class GetSystemIcon
    {
        public Icon Get(string fileName)
        {
            IntPtr hImgSmall;
            SHFILEINFO shinfo = new SHFILEINFO();
            hImgSmall = Win32.SHGetFileInfo(fileName, 0, ref shinfo, (uint)Marshal.SizeOf(shinfo), Win32.SHGFI_ICON | Win32.SHGFI_SMALLICON);
            Icon fileIcon = Icon.FromHandle(shinfo.hIcon);
            return 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;
    };
    class Win32
    {
        public const uint SHGFI_ICON = 0x100;
        public const uint SHGFI_LARGEICON = 0x0; // 'Large icon
        public const uint SHGFI_SMALLICON = 0x1; // 'Small icon
        [DllImport("shell32.dll")]
        public static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbSizeFileInfo, uint uFlags);
    }
}
 
参考:http://support.microsoft.com/kb/319350/zh-cn