c# - 为什么 CenterToScreen 方法会在光标所在的屏幕而不是具有焦点的应用程序的屏幕上使表单居中？

Question

我正在使用 Visual Studio 2010、C# .NET 4、WinForms。我的电脑有 2 个显示器。

当我调用窗体的 CenterToScreen 方法时，窗体会在光标所在的屏幕上居中。有谁知道为什么吗？

Answer 1

来自documentation :

Do not call this directly from your code. Instead, set the StartPosition property to CenterScreen.

The CenterToScreen method uses the following priority list to determine the screen used to center the form:

1. The Owner property of the form.
2. The HWND owner of the form.
3. The screen that currently has the mouse cursor.

因此，在表单的初始显示期间有效地使用了它。它不打算以后使用。

你可以这样写你自己的:

protected void ReallyCenterToScreen()
{
    Screen screen = Screen.FromControl(this);

    Rectangle workingArea = screen.WorkingArea;
    this.Location = new Point() {
        X = Math.Max(workingArea.X, workingArea.X + (workingArea.Width - this.Width) / 2),
        Y = Math.Max(workingArea.Y, workingArea.Y + (workingArea.Height - this.Height) / 2)
    };   
}