更换系统鼠标指针

我想用c#代码实现更改桌面背景和系统鼠标的图片请各位指点 --------------------编程问答-------------------- 用文件复制覆盖原图片不行吗 --------------------编程问答-------------------- UP --------------------编程问答-------------------- 找找API函数吧. --------------------编程问答-------------------- ,接分 --------------------编程问答-------------------- 给个更改鼠标指针的的类给你看看
public class CursorsStyle
    {
        [DllImport("user32.dll ")]
        public static extern IntPtr LoadCursorFromFile(string fileName);

        [DllImport("user32.dll ")]
        public static extern IntPtr SetCursor(IntPtr cursorHandle);

        [DllImport("user32.dll ")]
        public static extern uint DestroyCursor(IntPtr cursorHandle);

        [DllImport("User32.DLL")]
        public static extern bool SetSystemCursor(IntPtr hcur, uint id);

        [DllImport("User32.DLL")]
        public static extern bool SystemParametersInfo(uint uiAction, uint uiParam,
            IntPtr pvParam, uint fWinIni);

        public  const uint OCR_NORMAL = 32512;
        public  const uint OCR_IBEAM = 32513;
        public  const uint OCR_WAIT=32514;
        public  const uint OCR_CROSS = 32515;
        public  const uint OCR_UP = 32516;
        public const uint OCR_SIZE = 32640;
        public const uint OCR_ICON = 32641;
        public const uint OCR_SIZENESE =32642;
        public const uint OCR_SIZENESW = 32643;
        public const uint OCR_SIZEWE = 32644;
        public const uint OCR_SIZENS = 32645;
        public const uint OCR_SIZEALL= 32646;
        public const uint OCR_ICOCUR= 32647;
        public const uint OCR_NO = 32648;      
        public const uint OCR_HAND = 32649;       
      
       
        public const uint SPI_SETCURSORS = 87;
        public const uint SPIF_SENDWININICHANGE = 2;   
        /// <summary>
        /// 设置当前的窗体的鼠标样式
        /// </summary>
        /// <param name="fileName"></param>
        /// <returns></returns>
        public static Cursor CurrentCursorStyle(string fileName)
        {
            Cursor cursor = new Cursor(Cursor.Current.Handle);
            IntPtr colorCursorHandle = CursorsStyle.LoadCursorFromFile(fileName);
            cursor.GetType().InvokeMember("handle", BindingFlags.Public |
                BindingFlags.NonPublic | BindingFlags.Instance |
                BindingFlags.SetField, null, cursor, 
                new object[] { colorCursorHandle });
            return cursor;
        }

       /// <summary>
       /// 设置操作系统的鼠标样式
       /// </summary>
       /// <param name="fileName"></param>
        public static void SystemCursorStyle(string fileName)
        {
            Cursor cursor2 = CurrentCursorStyle(fileName);
            SetSystemCursor(cursor2.Handle, OCR_NORMAL);
                        
        }

        /// <summary>
        /// 还原操作系统的鼠标样式
        /// </summary>
        public static void BackCursor()
        {
            SystemParametersInfo(SPI_SETCURSORS, 0, IntPtr.Zero, SPIF_SENDWININICHANGE);
        }
    } --------------------编程问答-------------------- 5楼正解

补充：.NET技术 ,  C#