新增元件：

先載入列出來所有可用攝像頭放到combobox，從combobox選擇要用的攝像頭

思路：先列出所有攝像頭--開啟攝像頭--抓拍

using System;
using System.Drawing;
using System.Windows.Forms;
using AForge.Video.DirectShow;

namespace Aforge
{
    public partial class Form1 : DevComponents.DotNetBar.OfficeForm
    {
        public Form1()
        {
            InitializeComponent();
        }

        private FilterInfoCollection videoDevices;
        private VideoCaptureDevice videoSource;
        private int Indexof = 0;

        //新增所有的攝像頭到combobox列表裡
        private void Camlist()
        {
            videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);

            if (videoDevices.Count == 0)
            {
                MessageBox.Show("未找到攝像頭裝置");
            }
            foreach (FilterInfo device in videoDevices)
            {
                Cameralist.Items.Add(device.Name);
            }
        }

        //選擇要呼叫的攝像頭，捕獲視訊並展示到videoSourcePlayer1
        private void Device_Click(object sender, EventArgs e)
        {
            Indexof = Cameralist.SelectedIndex;
            if (Indexof < 0)
            {
                MessageBox.Show("請選擇一個攝像頭");
                return;
            }
            this.pictureBox1.Visible = false;
            this.videoSourcePlayer1.Visible = true;
            //videoDevices[Indexof]確定出用哪個攝像頭了。
            videoSource = new VideoCaptureDevice(videoDevices[Indexof].MonikerString);
            //設定下畫素，這句話不寫也可以正常執行：
            videoSource.VideoResolution = videoSource.VideoCapabilities[Indexof];
            //在videoSourcePlayer1裡顯示
            videoSourcePlayer1.VideoSource = videoSource;
            videoSourcePlayer1.Start();
        }

        //拍照//這裡多了一個pictureBox1，想的是展示下抓拍的照片
        private void buttonX1_Click(object sender, EventArgs e)
        {
            if (videoSource == null)
            {
                MessageBox.Show("請先開啟攝像頭");
                return;
            }
            //videoSourcePlayer繼承Control父類，定義 GetCurrentVideoFrame能輸出bitmap
            Bitmap bitmap = videoSourcePlayer1.GetCurrentVideoFrame();
            pictureBox1.Image = bitmap;
            this.videoSourcePlayer1.Visible = false;
            this.pictureBox1.Visible = true;
            //這裡停止攝像頭繼續工作 當然videoSourcePlayer裡也定義了 Stop();用哪個都行
            videoSourcePlayer1.Stop();
            // videoSourcePlayer1.SignalToStop(); videoSourcePlayer1.WaitForStop();
        }

        private void buttonX2_Click(object sender, EventArgs e)
        { // 加載出來所有的攝像頭
            Camlist();
        }
    }
}
 

（新人學習筆記，思路粗劣，讓大家見笑了。）