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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：
- 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;
- 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);
}
- 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。