之前做过拖动，找了两种方法：

1、

 private Point myPoint;          private void Form1_MouseMove(object sender, MouseEventArgs e)          {              if (e.Button == MouseButtons.Left)              {                  Point myPosition = Control.MousePosition;                  myPosition.Offset(myPoint.X, myPoint.Y);                  this.DesktopLocation = myPosition;              }          }          private void Form1_MouseUp(object sender, MouseEventArgs e)          {              if (e.Button == MouseButtons.Left)              {                  Point myPosition = Control.MousePosition;                  myPosition.Offset(myPoint.X, myPoint.Y);                  this.DesktopLocation = myPosition;              }          }          private void Form1_MouseDown(object sender, MouseEventArgs e)          {              myPoint = new Point(-e.X, -e.Y);          }        

这种方法要加三个事件Form1_MouseMove,Form1_MouseUp,Form1_MouseDown，可以实现但是拖动过程中有残影。

2、

 [System.Runtime.InteropServices.DllImport("user32.dll")]          public static extern bool ReleaseCapture();          [System.Runtime.InteropServices.DllImport("user32.dll")]          public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);          public const int WM_SYSCOMMAND = 0x0112;          public const int SC_MOVE = 0xF010;          public const int HTCAPTION = 0x0002;          private void Form1_MouseDown(object sender, MouseEventArgs e)          {              try              {                  ReleaseCapture();                  SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);              }              catch                 { }          }

这种方法没有残影。