WPF 单例执行，防止同一个进程运行两次

C# App 代码如下：

using System.Threading;
using System.Reflection;

public partial class App : Application
{
    private static Mutex mutex = null; 
　　protected override void OnStartup(StartupEventArgs e)
    {
        bool createdMutex;
        mutex = new Mutex(true, Assembly.GetExecutingAssembly().GetName().Name, out createdMutex);
        if (!createdMutex)
        {
            Current.Shutdown(); // 关闭当前实例
            return;
        }
        base.OnStartup(e);
    }
}