WPF简介与XAML语言

7///<summary>

8/// Interaction logic for App.xaml

9///</summary>

10publicpartialclass App : Application

11 {

12 Mutex mutex=null;

13protectedoverridevoid OnStartup(StartupEventArgs e)

14 {

15base.OnStartup(e);

16bool createdNew = false;

17 mutex = new Mutex(true, "WPFLifeCycle",out createdNew); 18if (!createdNew)

19 {

20 MessageBox.Show("程序正在运行中，无法启动另一个实例！", "系统提示", MessageBoxButton.OK, MessageBoxImage.Warning); 21this.Shutdown();

22 }

23 }

24 }

25}

此时如果我们已经运行了WPFLifeCycle.exe，当再双击此应用则会给出提示：