Winform无边框窗体实现拖动

winfrom窗体自带的边框不好看，可以将FormBorderStyle设置为None去除边框，但这样窗体无法拖动

下面记录无边框窗体拖动的几种方法[参考其他博主的]：

1.Form触发MouseDown事件时，记录鼠标坐标：

rawPoint = e.Location;

MouseMove时根据鼠标坐标的移动偏移量，设置窗体位置同步变化：

void Form1_MouseMove(object sender, MouseEventArgs e)
{
    if (e.Button != System.Windows.Forms.MouseButtons.Left)
        return;
    int x = e.X - rawPoint.X;
    int y = e.Y - rawPoint.Y;
    this.Location = new Point(this.Location.X + x, this.Location.Y + y);
}

2.Form上方放置控件(如Label)来模拟边框，通过控件的MouseDown和MouseMove事件来实现,同方法1；

3.调用win32 api，Form的MoveDown触发时，向系统发送鼠标点击窗体非客户区的消息（模拟点击窗体边框）：

[DllImport("user32.dll")]
public static extern bool ReleaseCapture();

[DllImport("user32.dll")]
public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);

private const int LeftButtonDown = 0xA1;
private const int HTCaption = 0x02;

private void Form1_MouseDown(object sender, MouseEventArgs e)
{
    ReleaseCapture();
    SendMessage((IntPtr)this.Handle, LeftButtonDown, HTCaption, 0);
}

4.重写WndProc函数，拦截鼠标左击窗体的消息，改为左击窗体的非客户区：

protected override void WndProc(ref Message m)
{
    switch (m.Msg)
    {
        case 0x0201:
            {
                m.Msg = 0xA1;
                m.WParam = new IntPtr(2);
                m.LParam = new IntPtr(0);
            }
            break;
    }
    base.WndProc(ref m);
}

以上方式均可实现窗体拖动。