C#代码 framwork4.0 把外接摄像头分装成一个控件，此方法不是调用系统api，是可以同时打开多个摄像头的。-C# code framwork4.0 external camera mounted into a control, this method instead of calling the system api can be open at the same time more than one camera.

c# 同时调用2个摄像头 实现拍照和显示帧数(C# simultaneously calls 2 cameras to achieve photo and display fr a mes.)