C# 获取进程退出代码

        static void Main(string[] args)
        {
            Environment.Exit(-100);
        }

        private Process _process;

        public MainWindow()
        {
            InitializeComponent();
            var process = new Process {StartInfo = new ProcessStartInfo("控制台.exe")};
            _process = process;
            process.Start();
        }

 var process = Process.GetProcessById(控制台进程);

System.ArgumentException:“ID 为 xx 的进程当前未运行。”