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using System.Runtime.InteropServices;
//并为控件 添加 MouseDown 事件
// C#鼠标拖动任意控件
// 利用Windows的API函数:SendMessage 和 ReleaseCapture
const uint WM_SYSCOMMAND = 0x0112;
const uint SC_MOVE = 0xF010;
const uint HTCAPTION = 0x0002;
[DllImport("user32.dll", EntryPoint = "SendMessageA")]
private static extern int SendMessage(IntPtr hwnd, uint wMsg, uint wParam, uint lParam);
[DllImport("user32.dll")]
private static extern int ReleaseCapture();
void ControlMouseDown(object sender, MouseEventArgs e)
{
ReleaseCapture();
SendMessage((sender as Control).Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
}