从Win7开始，Windows支持多显示器输出，多个显示器可以作为相互“复制”（显示同一桌面），也可以“扩展”（两个显示器拼成大桌面）。这时可以在一个桌面的程序中，用VLC监视另一个桌面。

1、安装扩展：工具→包管理器→浏览“VLC”→安装扩展

2、从工具箱中拖动VLC控件到窗体设计器中

3、配置VLC库文件路径：VLC控件→事件→VlcLibDirectoryNeeded

private void vlcPreview_VlcLibDirectoryNeeded(object sender, Vlc.DotNet.Forms.VlcLibDirectoryNeededEventArgs e)

{

string myVLC = @"C:\Program Files (x86)\VideoLAN\VLC";

var currentAssembly = Assembly.GetEntryAssembly();

var currentDirectory = new FileInfo(currentAssembly.Location).DirectoryName;

if (currentDirectory == null)

return;

if (AssemblyName.GetAssemblyName(currentAssembly.Location).ProcessorArchitecture == ProcessorArchitecture.X86)

e.VlcLibDirectory = new DirectoryInfo(Path.Combine(currentDirectory, myVLC));

}

4、监控桌面代码：（扩展桌面在主桌面右侧）

//计算VLC抓拍（监视）参数

String[] playOption = {

":screen-top=0",

":screen-left=1921",

":screen-width=1920",

":screen-height=1080",

":screen-fps=30.000000"

};

//监视桌面

vlcPreview.Play(new Uri("screen://"), playOption);

最终效果：