C#调用电脑摄像头拍照

1.打开VS，新建一个Form窗体，工具->NuGet包管理工具->管理解决方案的NuGet包，在浏览里搜索AForge.Controls、AForge.Video.DirectShow，安装AForge.Controls和AForge.Video.DirectShow

2.安装AForge组件完成后，VS工具箱会新增AForge控件，把AForge.NET中的VideoSourcePlayer拖到Form窗体上

 3.关键代码

        #region 变量
        /// <summary>
        /// 摄像头设备集合
        /// </summary>
        FilterInfoCollection videoDevices;

        /// <summary>
        /// 捕获设备资源
        /// </summary>
        VideoCaptureDevice videoSource;

        /// <summary>
        /// 处理图片
        /// </summary>
        Bitmap bitImg;
        #endregion


        /// <summary>
        /// 先检测摄像头
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_Load(object sender, EventArgs e)
        {
            //检测电脑所有的摄像头
            videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
            MessageBox.Show("检测到了【" + videoDevices.Count.ToString() + "】个摄像头");

            //获取需要拍照的设备
            videoSource = new VideoCaptureDevice(videoDevices[0].MonikerString);
            videoSourcePlayer1.VideoSource = videoSource;

            //启动摄像头
            videoSourcePlayer1.Start();
        }

        /// <summary>
        /// 拍照
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            //拍摄并获取图片
            bitImg = videoSourcePlayer1.GetCurrentVideoFrame();
        }


        /// <summary>
        /// 关闭摄像头
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {
            ShutCamera();
        }

        /// <summary>
        /// 关闭并释放摄像头
        /// </summary>
        public void ShutCamera()
        {
            if (videoSourcePlayer1.VideoSource != null)
            {
                videoSourcePlayer1.SignalToStop();
                videoSourcePlayer1.WaitForStop();
                videoSourcePlayer1.VideoSource = null;
            }
        }