App.Xaml的视图模型 [英] A View Model for App.Xaml

问题描述

我们可以为App.Xaml使用viewModel吗，以便我们可以在启动时进行一些逻辑推断，也可以构成应用程序的起点...

Can we have a viewModel for App.Xaml so that we can do some logical deductions on startUp and also form a starting point of app...

推荐答案

否，App.xaml不是Window类，而是您的Application类.

No, App.xaml is not a Window class, it is your Application class.

您仍然可以覆盖它的OnStartup()方法来处理您自己的自定义逻辑并启动特定的Views/ViewModels.

You can still overwrite the OnStartup() method of it to handle your own custom logic and to startup specific Views/ViewModels.

例如

protected override void OnStartup(StartupEventArgs e)
{
    base.OnStartup(e);

    var login = new LoginDialog();
    var loginVm = new LoginViewModel();

    login.DataContext = loginVm;
    login.ShowDialog();

    if (!login.DialogResult.GetValueOrDefault())
    {
        Environment.Exit(0);
    }

    // Providing we have a successful login, startup application
    var app = new ShellView();
    var context = new ShellViewModel(loginVm.CurrentUser);
    app.DataContext = context;
    app.Show();
}

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