在C＃上移动按钮

Question

I am working on an exercise which I have to move a button by mouse but I need to save the first location of this button.
this is my code:

private Point location => new Point(button1.Location.X, button1.Location.Y);
private void button1_MouseDown(object sender, MouseEventArgs e)
    {
        isMouseDown = true;
    }
    private void button1_MouseMove(object sender, MouseEventArgs e)
    {
        if(isMouseDown)
        {
            button1.Left = e.X + button1.Left - (button1.Width / 2);
            button1.Top = e.Y + button1.Top - (button1.Height / 2);
        }
    }

but location's value change after moving the button , what I have to do for save the first value.

Answer 1

Just

private Point location => new Point(button1.Location.X, button1.Location.Y);
private void button1_MouseDown(object sender, MouseEventArgs e) {
    isMouseDown = true;
    location.X = button1.Location.X;
    location.Y = button1.Location.Y;
}

If you need to save all positions then you can use a list of points

private List<Point> locations = new List<Point>();
private void button1_MouseDown(object sender, MouseEventArgs e) {
    isMouseDown = true;
    locations.Add(new Point(button1.Location.X, button1.Location.Y)); // where locations[0] is your first point
}

Answer 2

You are calling a function to read the 'Location' variable, you should simply assign the value.

private Point location = new Point(button1.Location.X, button1.Location.Y);

Also, you need a mouseup event, where you set:

isMouseDown = false;

Otherwise it will be true forever.