C#WPF如何更新启动事件

当应用程序打开时，将显示带有加载消息的启动屏幕，然后登录窗口将在启动屏幕前弹出。我现在的问题是，当成功登录时，如何继续，登录窗口将消失，启动屏幕仍将显示不同的加载消息，然后启动屏幕将完全消失，最后将执行应用程序的主窗口？是否可以更新启动事件

以下是我在App.xaml.cs中的代码：

public partial class App : Application
{
    protected override void OnStartup(StartupEventArgs e)
    {
        SplashScreen splashScreen = new SplashScreen();
        splashScreen.Show();

        var startupTask = new Task(() =>
            {
                //Set custom message on screen
                splashScreen.Dispatcher.BeginInvoke((Action)(() => splashScreen.LoadingMsg = "Please wait..."));
                Thread.Sleep(500);
                splashScreen.Dispatcher.BeginInvoke((Action)(() => splashScreen.LoadingMsg = "Please provide login information..."));
                Thread.Sleep(300);
            });

        //When loading finished, show login window
        startupTask.ContinueWith(t =>
            {
                Login loginWindow = new Login();

                //When login window is loaded, the splash screen stays behind the login window 
                loginWindow.Loaded += (sender, args) => splashScreen.InvalidateVisual();

                this.MainWindow = loginWindow;

                //Show the login window in modal mode
                loginWindow.ShowDialog();
            }, TaskScheduler.FromCurrentSynchronizationContext());

        startupTask.Start();            
    }
}

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嗯，我会担心使用任务延续来编排视图事件

那么，您可以使用一种中介模式来获取各种屏幕的ViewModels，以响应其他ViewModels引发的事件，该模式如何？ 例如：

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你能把你的登录屏幕和启动屏幕结合起来吗？

using System;
using System.Collections.Generic;

namespace UnitTestProject2
{

    public class ViewModel1
    {
        IMediator mediator;
        public ViewModel1(IMediator mediator)
        {
            this.mediator = mediator;
        }

        public string UserId { get; set; }
        public void Login(string userid)
        {
            this.UserId = userid;
            this.mediator.RaiseEvent("LoggedIn", this.UserId);
        }
    }

    public class VieowModel2
    {
        IMediator mediator;
        public VieowModel2(IMediator mediator)
        {
            this.mediator = mediator;
            this.mediator.ListenFor("LoggedIn", LoggedIn);
        }
        protected string UserId;
        protected void LoggedIn(Object sender, EventArgs e)
        {
            UserId = sender.ToString();
        }
    }

    public interface IMediator
    {
        void ListenFor(string eventName, EventHandler action);
        void RaiseEvent(string eventName, object data);
    }
}