wpf 如果用户登录成功，那么我想显示主窗口，如果没有，我想退出应用程序
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If the user logs on successfully, then I want to show the main window, if not, I want to exit the application
提问by Sako73
Stupidly simple question I can't figure out.
愚蠢的简单问题我无法弄清楚。
I have a WPF application, and I want to display a Logon dialog box first (before the main window shows up).
我有一个 WPF 应用程序，我想先显示一个登录对话框（在主窗口出现之前）。
If the user logs on successfully, then I want to show the main window, if not, I want to exit the application.
如果用户登录成功，那么我想显示主窗口，如果没有，我想退出应用程序。
How does one do this correctly?
如何正确地做到这一点？
回答by Sako73
I think I figured out what I was trying to do.
我想我明白了我想要做什么。
1) I needed to set the "StartupUri" in the App.xaml to "Logon.xaml", where Logon.xaml is my logon window.
1) 我需要将 App.xaml 中的“StartupUri”设置为“Logon.xaml”，其中 Logon.xaml 是我的登录窗口。
2) in the LogonButton_Click event handler, I added the following
2) 在 LogonButton_Click 事件处理程序中，我添加了以下内容
if (blnAuthenticateSuccessful) {
MainWindow main = new MainWindow();
App.Current.MainWindow = main;
this.Close();
main.Show();
}
This seems to accomplish what I want.
这似乎完成了我想要的。
回答by Joel Kennedy
If you wanted a new window to appear to allow the user to enter their login information, then I have added some code below. However, creating a true Modal Dialog box is a bit more complicated in WPF so I haven't explained it here. There is information about modal dialog boxes in WPF here: http://msdn.microsoft.com/en-us/library/aa969773.aspx
如果您希望出现一个新窗口以允许用户输入他们的登录信息，那么我在下面添加了一些代码。但是，在WPF中创建一个真正的Modal Dialog要稍微复杂一些，所以我没有在这里解释。这里有关于 WPF 中模态对话框的信息：http: //msdn.microsoft.com/en-us/library/aa969773.aspx
From the MainWindow you can open the login window and hide the main window with this:
从 MainWindow 您可以打开登录窗口并使用以下命令隐藏主窗口：
// Code for MainWindow
// Create a new instance of the login window and then show it
LoginWindow loginWindow = new LoginWindow();
loginWindow.Show();
// Hide the MainWindow until later
this.Hide();
Then use this on the login page to show the main window again once the user has logged in:
然后在用户登录后在登录页面上使用它再次显示主窗口：
// Code for Login window
// This code finds the main window again and shows it
Application.Current.MainWindow.Show();
回答by Dipen Shah
I know its an old question but I had a similar problem and I solved it bit differently so just wanted to add that so in future someone might benefit from it.
我知道这是一个老问题，但我有一个类似的问题，我解决的方法有点不同，所以只是想补充一下，这样将来有人可能会从中受益。
To solve the problem you can change application shutdown mode to OnExplicitShutdownand then call Application.Shutdown(0) whenever you want to. For example:
要解决此问题，您可以将应用程序关闭模式更改为OnExplicitShutdown，然后随时调用 Application.Shutdown(0)。例如：
public App()
{
App.Current.ShutdownMode = ShutdownMode.OnExplicitShutdown;
}
protected override void OnStartup(StartupEventArgs e)
{
base.OnStartup(e);
// assume code below is for displaying dialog
if (MessageBox.Show("Continue?", "", MessageBoxButton.YesNo) == MessageBoxResult.No)
App.Current.Shutdown(0);
}
Here in the constructor, I'm changing application shudown mode and calling Shutdown method when I need to.
在构造函数中，我正在更改应用程序关闭模式并在需要时调用 Shutdown 方法。
Caution: When you change ShutdownModemake sure to call Shutdownmethod otherwise your application will be in memory even after main window closes. I've overrided OnClosedmethod in my MainWindow to do that:
注意：当您更改时，请ShutdownMode确保调用Shutdown方法，否则即使在主窗口关闭后，您的应用程序也会在内存中。我OnClosed在 MainWindow 中重写了方法来做到这一点：
protected override void OnClosed(EventArgs e)
{
base.OnClosed(e);
App.Current.Shutdown(0);
}
