C#调用usb摄像头的实现方法

using System;
using System.Windows.Forms;
using AForge.Video.DirectShow;
namespace usbcamera
{
  public partial class Form1 : Form
  {
    private FilterInfoCollection videoDevices;//所有摄像设备
    private VideoCaptureDevice videoDevice;//摄像设备
    public Form1()
    {
      InitializeComponent();
    }
    private void Form1_Load(object sender, EventArgs e)
    {
      videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);//得到所有接入的摄像设备
      if (videoDevices.Count != 0)
      {
        foreach (FilterInfo device in videoDevices)
        {
          comboBox1.Items.Add(device.Name);//把摄像设备添加到摄像列表中          
        }        
      }
      else
      {
        MessageBox.Show("没有找到摄像头！");
      }
    }
    private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
    {
      videoDevice = new VideoCaptureDevice(videoDevices[comboBox1.SelectedIndex].MonikerString);      
      videoSourcePlayer1.VideoSource = videoDevice;       
      videoSourcePlayer1.SignalToStop();
      videoSourcePlayer1.WaitForStop();
      videoSourcePlayer1.Start();
    }
    private void button1_Click(object sender, EventArgs e)
    {
      videoSourcePlayer1.Stop();
    }
  }
}