C# Winform 用鼠标拖动工作区

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方案1：通过重载消息处理实现。（优点：不用声明api函数。缺点是：窗体上放着Panel等容器就会失效）

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constintWM_NCHITTEST = 0x0084;
constintHTLEFT = 10;
constintHTCAPTION = 2;
constintHTCLIENT = 1;
protectedoverridevoidWndProc(refMessage m)
{
  base.WndProc(refm);
  switch(m.Msg)
  {
    caseWM_NCHITTEST:
    if(m.Result == (IntPtr)HTCLIENT)
    m.Result = (IntPtr)HTCAPTION;
    break;
  }
}

方案2：发送一个拖动的消息（优点是：可以放在任意控件鼠标按下事件中）

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using System.Runtime.InteropServices;

[DllImport("User32.DLL")]
public static extern int SendMessage(IntPtr hWnd, uint Msg, int wParam, int lParam);
[DllImport("User32.DLL")]
public static extern bool ReleaseCapture();
public const uint WM_SYSCOMMAND = 0x0112;
public const int SC_MOVE = 61456;
public const int HTCAPTION = 2;

private void Form1_MouseDown(object sender, MouseEventArgs e)
{
  ReleaseCapture();
  SendMessage(Handle, WM_SYSCOMMAND, SC_MOVE | HTCAPTION, 0);
}