C#控件Picturebox实现鼠标拖拽功能

private void InitializeComponent()
{
  // 
  // RealPlayWnd
  // 
  this.RealPlayWnd.MouseUp += new MouseEventHandler(this.RealPlayWnd_MouseUp);
  this.RealPlayWnd.MouseDown += new MouseEventHandler(this.RealPlayWnd_MouseDown);
  this.RealPlayWnd.MouseMove += new MouseEventHandler(this.RealPlayWnd_MouseMove);

}

int xPos;
int yPos;
bool MoveFlag;
  //在picturebox的鼠标按下事件里,记录三个变量.
  private void RealPlayWnd_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
  {
    MoveFlag = true;//已经按下.
    xPos = e.X;//当前x坐标.
    yPos = e.Y;//当前y坐标.
  }

 //在picturebox的鼠标按下事件里.
 private void RealPlayWnd_MouseUp(object sender, MouseEventArgs e)
 {
   MoveFlag = false; 
 }

 //在picturebox鼠标移动
 private void RealPlayWnd_MouseMove(object sender, MouseEventArgs e)
 { 
   if (MoveFlag)
   {
     RealPlayWnd.Left += Convert.ToInt16(e.X - xPos);//设置x坐标.
     RealPlayWnd.Top += Convert.ToInt16(e.Y - yPos);//设置y坐标.
   }
}