c#设置桌面壁纸

其实就是调用系统api而已，原型是：

BOOL WINAPI SystemParametersInfo(
__in UINT uiAction,
__in UINT uiParam,
__in_out PVOID pvParam,
__in UINT fWinIni
);

1using System.Runtime.InteropServices;
//////声明下
2[DllImport("user32.dll", EntryPoint = "SystemParametersInfoA")]
3static extern Int32 SystemParametersInfo(Int32 uAction, Int32 uParam, string lpvParam, Int32 fuWinIni);//////lpvParam要设置成string
4private const int SPI_SETDESKWALLPAPER = 20;
5
6SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, filename, 1);/////调用，filename为图片地址，最后一个参数需要为1，0的话在重启后就变回原来的了
至少vista下成功了。