一个工具类，让你用C#换桌面墙纸

参考了这篇文章：

http://blog.csdn.net/sonyicn/archive/2006/05/20/746280.aspx

现实代码如下：

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using Microsoft.Win32;
using System.IO;

namespace RockLib
{
    public class Utils
    {
        /**//// <summary>
        /// Change user's desktop wallpaper
        /// </summary>
        /// <param name="picturePath"></param>
        /// <param name="style"></param>
        /// <returns></returns>
        public static bool ChangeWallPaper(string picturePath, WallPaperStyle style)
        {
            RegistryKey myRegKey = Registry.CurrentUser.OpenSubKey("Control Panel\\desktop", true);
            switch (style)
            {
                case WallPaperStyle.Center:
                    myRegKey.SetValue("TileWallpaper", "0");
                    myRegKey.SetValue("WallpaperStyle", "0");
                    break;
                case WallPaperStyle.Tile:
                    myRegKey.SetValue("TileWallpaper", "1");
                    myRegKey.SetValue("WallpaperStyle", "0");
                    break;
                case WallPaperStyle.Stretch:
                    myRegKey.SetValue("TileWallpaper", "0");
                    myRegKey.SetValue("WallpaperStyle", "2");
                    break;
                default:
                    throw new NotSupportedException("style");                    
            }

          
            myRegKey.Close();

            int intResult;
            
            if (!File.Exists(picturePath))
            {
                throw new ArgumentException(string.Format("Picture {0} cannot be found.", picturePath));
            }

            intResult = SystemParametersInfo(20, 3, picturePath, 0x1 | 0x2);

            return intResult > 0;

        }

        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern int SystemParametersInfo
            (int uAction, int uParam, string lpvParam, int fuWinIni);   
    }

    public enum WallPaperStyle
    {
        Center,
        Tile,
        Stretch
    }
}

测试代码：

private void button2_Click(object sender, EventArgs e)
{
   string  filePath = AppDomain.CurrentDomain.BaseDirectory+ "\\untitled.bmp";
   if (!Utils.ChangeWallPaper(filePath, WallPaperStyle.Tile))
   {
       MessageBox.Show("Change failed.");
   }
}