1         //定义一个bool变量标识是否拖动窗体
2         private bool isMove = false;
3         //记录鼠标的位置
4         private Point point;

定义的变量 

 1         /// <summary>
 2         /// 窗体的鼠标按下事件
 3         /// </summary>
 4         /// <param name="sender"></param>
 5         /// <param name="e"></param>
 6         private void Form1_MouseDown(object sender, MouseEventArgs e)
 7         {
 8             isMove = true;
 9             //记录鼠标的位置
10             point = e.Location;
11         }

窗体的鼠标按下事件 

 1         /// <summary>
 2         /// 窗体的鼠标移动事件
 3         /// </summary>
 4         /// <param name="sender"></param>
 5         /// <param name="e"></param>
 6         private void Form1_MouseMove(object sender, MouseEventArgs e)
 7         {
 8             //是否移动窗体
 9             if (isMove)
10             {
11                 //记录鼠标移动后的值
12                 Point p = e.Location;
13                 //计算鼠标按下和移动后的距离
14                 int x = p.X - point.X;
15                 int y = p.Y - point.Y;
16                 //窗体的位置
17                 this.Location = new Point(this.Location.X + x, this.Location.Y + y);
18             }
19         }

鼠标移动事件 

 1         /// <summary>
 2         /// 鼠标弹起事件
 3         /// </summary>
 4         /// <param name="sender"></param>
 5         /// <param name="e"></param>
 6         private void Form1_MouseUp(object sender, MouseEventArgs e)
 7         {
 8             //不允许在移动窗体
 9             isMove = false;
10         }

鼠标弹起事件

 

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