在WPF中从一个窗口切换到另一个窗口并使其处于活动状态

Question

I'm pretty new to WPF and I'm trying to make a database system. What I currently have is a Login Window. When you enter the user and password you are supposed to go to another window StudentInfoSystem . The code I used is pretty basic and common.

var info = new StudentInfoSystem.MainWindow();
info.Show();        
this.Close();

So, what this would do, is after you press the login button, you get transferred to StudentInfoSystem and the login window closes. The problem I have with Show() is that it opens a window and immediately returns, right? It doesn't wait for the new window to close. So, my question is how can I open a new window and WORK with it? When I say work, I meant to show out information in my textboxes (In the NEWLY opened window) depending on the role the user has, etc...

Answer 1

I'm guessing the above code is in the button click handler for the Login Window, which would make the Login Window the parent of the StudentInfoSystem window.
Since WPF will close the parent and any child(ren) window(s) when closing the parent window, your StudentInfo window will also close when calling

this.Close();

One option might be to instead call

this.Hide();

but without seeing how the rest of your app is set up, not 100% sure this is the best approach.

Perhaps see these SO questions:

1. wpf-create-sibling-window-and-close-current-one

2. how-to-close-current-window-in-code-when-launching-new-window

Answer 2

尝试使用window.Activate()来聚焦新窗口和/或[any element].Focus()以聚焦窗口中的任何元素。

Answer 3

As I understand, this should do what you want:

info.ShowDialog();

You could also check ShutdownMode property. I would rather say, login window is sth you want to close after login, but do what you want :). Usage of ShutdownMode property:

public partial class App : Application
{
    protected override void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);    
        this.ShutdownMode = System.Windows.ShutdownMode.OnLastWindowClose;
    }
}