C#重新启动时，关闭较早的进程

WPF程序重新启动，如果有客户端进程存在，则关闭较早的进程

 　　　　private static System.Threading.Mutex mutex;
        public App()
        {
            this.Startup += new StartupEventHandler(App_Startup);
        }
        /// <summary>
        /// 登陆前判断是否存在客户端进程
        /// </summary>
        void App_Startup(object sender, StartupEventArgs e)
        {
            bool ret;
            mutex = new System.Threading.Mutex(true, "TCClient", out ret);
            Logger.D("打印有没有重复进程：",(!ret).ToString());
            if (!ret)
            {
                Process process = Process.GetCurrentProcess();//后运行的程序
                foreach (Process p in Process.GetProcessesByName("TCClient"))
                {
                    //不是同一进程并且本进程启动时间最晚,则关闭较早进程
                    if (p.Id != process.Id && (p.StartTime - process.StartTime).TotalMilliseconds <= 0)
                    {
                         p.Kill();
                        //Application.Current.Shutdown(-1);
                         Thread.Sleep(500);
                        return;
                    }
                }

                //MessageBox.Show("已存在一个本客户端进程在运行，请手动关闭后再重新启动", "系统提示", MessageBoxButton.OK);
                //Environment.Exit(0);
            }

        }