videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);                    if (videoDevices.Count == 0)                    {                        MessageBox.Show("未检测到摄像头，请确认！");                        return;                    }                    selectedDeviceIndex = 0;                    videoSource = new VideoCaptureDevice(videoDevices[selectedDeviceIndex].MonikerString);//连接摄像头                    int ResolutionIndex = 0;                    for (int i = 0; i < videoSource.VideoCapabilities.Length; i++)                    {                        if (videoSource.VideoCapabilities[i].FrameSize.Width == 1600)  //1600*1200分辨率即可                        {                            ResolutionIndex = i;                            break;                        }                    }                    videoSource.VideoResolution = videoSource.VideoCapabilities[ResolutionIndex];                    videoSourcePlayer1.VideoSource = videoSource;                    // set NewFrame event handler                    videoSourcePlayer1.Start();

　

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videoSourcePlayer 控件就不说了 代码操作很简单 但有可能部分usb摄像头不支持 截图

if (videoSource == null)                                return;                            Bitmap bitmap = videoSourcePlayer1.GetCurrentVideoFrame();