https://zhidao.baidu.com/question/2116834779399609987.html
[DllImport("user32.dll", EntryPoint = "ReleaseCapture")]
public static extern void ReleaseCapture();
[DllImport("user32.dll", EntryPoint = "SendMessage")]
public static extern void SendMessage(int hwnd, int wMsg, int wParam, int lParam);
把上面语句加载窗体类文件中，然后在拖拽的控件上加事件，比如我是一个panel
private void panelForm_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
ReleaseCapture();
SendMessage((int)移动的对象.Handle, 0xA1, 2, 0);
//是窗体自身就是
//SendMessage((int)this.Handle, 0xA1, 2, 0);
//panel就是SendMessage((int)panel1.Handle, 0xA1, 2, 0);
}
}
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这种才是windows标准的拖拽事件，下面那位，拖动的时候窗体会闪烁不停，一直在渲染背景