c#将单击事件添加到无边框可拖动窗体

private bool isDragging = false;
private Point lastLocation;

private void Form1_MouseDown(object sender, MouseEventArgs e)
{
    isDragging = true;
    lastLocation = e.Location;
}

private void Form1_MouseMove(object sender, MouseEventArgs e)
{
    if (isDragging)
    {
        this.Location = new Point(
            (this.Location.X - lastLocation.X) + e.X, 
            (this.Location.Y - lastLocation.Y) + e.Y);

        this.Update();
    }
}

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

public Form1()
{
    InitializeComponent();
    this.MouseDown += new MouseEventHandler(Form1_MouseDown);
    this.MouseMove += new MouseEventHandler(Form1_MouseMove);
    this.MouseUp += new MouseEventHandler(Form1_MouseUp);
}