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protected override void OnStartup(StartupEventArgs e)
    {
       Window testWindow = new Window();
       testWindow.ShowDialog();
       testWindow.Close();
       // THE CODE BELOW WILL NOT SHOW THE NEXT WINDOW
       Window testWindow2 = new Window();
       testWindow2.ShowDialog();
       testWindow2.Close();
    }
同一个程序里面启动多个WINDOWS
第二个立即返回了
改成 OnExplicitShutdown

OnLastWindowClose

应用程序在最后一个窗体关闭时，或调用Shutdown方法时才会关闭

l OnMainWindowClose

An application shuts down when either the main window closes, or Shutdown is called.

应用程序在主窗体关闭时，或调用Shutdown方法时才会关闭

l OnExplicitShutdown

应用程序只有在调用Shutdown方法时才会关闭。

Very long delay before MediaOpened event raised on MediaElement
http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/8d168db2-5496-4f8f-ace5-abc6e5902d43/

Life Is Art – 博客园
http://www.cnblogs.com/RMay/

WPF ShowDialog returns null immediatly on second call … – Stack Overflow
http://stackoverflow.com/questions/1243833/wpf-showdialog-returns-null-immediatly-on-second-call
protected override void OnStartup(StartupEventArgs e)
    {
       Window testWindow = new Window();
       testWindow.ShowDialog();
       testWindow.Close();
       // THE CODE BELOW WILL NOT SHOW THE NEXT WINDOW
       Window testWindow2 = new Window();
       testWindow2.ShowDialog();
       testWindow2.Close();
    }

引用 4.WPF应用程序管理 – 一个半天的日志 – 网易博客
http://blog.163.com/wangzhenguo2005@126/blog/static/371405262009102322715437/

分享:WPF编程体验,先启动登录==>后启动主程序的运行机制实现
http://topic.csdn.net/u/20080531/13/7b636858-ed76-43f6-b243-2921bfd16a48.html

WPF SDK研究之 AppModel – 包建强的开源地带 – 博客园
http://www.cnblogs.com/jax/articles/1142889.html

Hiding a window triggering the Closing event?
http://social.msdn.microsoft.com/Forums/zh-HK/wpf/thread/0f7ffa69-4b43-421d-894b-aa5d6ef7b678
      private void SearchForm_Closing(object sender, CancelEventArgs args)
      {
          Save(); // Doing something
          args.Cancel = true;
          // Trying to hide
          Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Background, (DispatcherOperationCallback)delegate(object o)
          {
             Hide();
             return null;
          }, null);
      }

Window.DialogResult Property (System.Windows)
http://msdn.microsoft.com/en-us/library/system.windows.window.dialogresult.aspx

SecurityException when running a Windows Application – .NET Development – Windows Tech
http://windows-tech.info/13/881f8bcfd0bfd5a2.php

Using DB on multiple forms – .NET Development – Windows Tech
http://windows-tech.info/13/a9c04603728f1ad2.php

标签：OnExplicitShutdown, OnStartup