C#无标题栏窗体拖动

要实现C#无标题栏窗体的拖动功能，可以通过以下步骤实现：

1. 在窗体的构造函数中添加以下代码，以去掉标题栏：

this.FormBorderStyle = FormBorderStyle.None;

2. 然后，添加以下代码以处理鼠标按下事件：

private const int WM_NCHITTEST = 0x0084;
private const int HT_CAPTION = 0x0002;

protected override void WndProc(ref Message m)
{
    switch (m.Msg)
    {
        case WM_NCHITTEST:
            base.WndProc(ref m);
            if ((int)m.Result == HT_CLIENT)
                m.Result = (IntPtr)HT_CAPTION;
            return;
    }
    base.WndProc(ref m);
}

3. 最后，通过处理鼠标按下和移动事件来实现拖动功能：

private bool isDragging = false;
private Point lastCursor;
private Point lastForm;

private void Form1_MouseDown(object sender, MouseEventArgs e)
{
    isDragging = true;
    lastCursor = Cursor.Position;
    lastForm = this.Location;
}

private void Form1_MouseMove(object sender, MouseEventArgs e)
{
    if (isDragging)
    {
        int x = lastForm.X - (lastCursor.X - Cursor.Position.X);
        int y = lastForm.Y - (lastCursor.Y - Cursor.Position.Y);
        this.Location = new Point(x, y);
    }
}

private void Form1_MouseUp(object sender, MouseEventArgs e)
{
    isDragging = false;
}

将上述代码添加到你的窗体上即可实现无标题栏窗体的拖动功能。