C#更换桌面

Question

using System.Runtime.InteropServices;[DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern int SystemParametersInfo(int uAction, int uParam, string lpvParam, int fuWinIni);        private void button1_Click(object sender, EventArgs e)
        {
            int nResult;
            if(File.Exists(""))
            {
                nResult = SystemParametersInfo(20, 1, "", 0x1 | 0x2);
                if(nResult==0)
                    MessageBox.Show("error");
                else
                    MessageBox.Show("ok");    
            }
        }

Answer 1

更改注册表里的值就可以了
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
    }
}

Answer 2

using System.Runtime.InteropServices; [DllImport("user32.dll", CharSet = CharSet.Auto)] 
        public static extern int SystemParametersInfo(int uAction, int uParam, string lpvParam, int fuWinIni);         private void button1_Click(object sender, EventArgs e) 
        { 
            int nResult; 
            if(File.Exists("")) 
            { 
                nResult = SystemParametersInfo(20, 1, "", 0x1 | 0x2); 
                if(nResult==0) 
                    MessageBox.Show("error"); 
                else 
                    MessageBox.Show("ok");    
            } 
        } 
这个简洁些！把提示修改一下就可以用了。

Answer 3

更换不了，图片不能成为背景，改是可以改了
 SystemParametersInfo(20, 1, @"..\\image\2.jpg", 0x1 | 0x2);不对
SystemParametersInfo(20, 1, @"C:\\Documents and Settings\Administrator\桌面\burst\burst\image\2.jpg", 0x1 | 0x2);也不对，
路径出问题了？