Question

我正在做一个练习，必须通过鼠标移动一个按钮，但是我需要保存该按钮的第一个位置。
这是我的代码：

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);
        }
    }

但是在移动按钮后位置的值会发生变化，我要做的是保存第一个值。

Answer 1

只是

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;
}

如果需要保存所有位置，则可以使用点列表

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

您正在调用函数来读取'Location'变量，您应该简单地assign值。

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

此外，您需要设置一个mouseup事件：

isMouseDown = false;

否则，它将永远是真的。

在C＃上移动按钮

2 个答案: