c#界面鼠标拖动

 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。