wpf程序，只允许运行一个程序实例问题

https://bbs.csdn.net/topics/390486402

https://codereview.stackexchange.com/questions/20871/single-instance-wpf-application

http://blogs.microsoft.co.il/arik/2010/05/28/wpf-single-instance-application/

http://blogs.microsoft.co.il/blogs/arik/SingleInstance.cs.txt