Showdialog in sequence cannot be created for multiple windows in the WPF app.

The reason is as follows:

Http://www.silverlightchina.net/html/study/WPF/2012/0226/14062.html

Solution:

Http://stackoverflow.com/questions/4179758/how-to-detect-that-a-window-has-used-up-its-showdialog-call

Preferably

Application. Current. shutdownmode = shutdownmode. onexplicitshutdown; var login = new loginwindow (); login. showdialog (); If (null! = Login. accountinfo) {This. mainwindow = new mainwindow (login. accountinfo); this. mainwindow. showdialog ();} application. Current. Shutdown ();