使用C# windows窗体远程关闭PC？

我正在尝试通过命令提示符使用 C# 以编程方式远程关闭 PC，我已经做了一些搜索并找到了此类代码。

System.Diagnostics.Process.Start("shutdown", "/s");

因为它没有指定要关闭的任何电脑，所以我尝试将该代码更改为我认为满足我的目标的代码。但事实证明这行不通。

System.Diagnostics.Process.Start("shutdown", "/s /m \\192.168.1.21 /t 5 /c 'Shutdown in 5 seconds'");

C# 中没有异常，它只是不关闭。

我也尝试过这个，但没有运气。

 System.Diagnostics.Process.Start("shutdown /s /m \\192.168.1.21 /t 5 /c 'Shutdown in 5 seconds'");

C# 异常“系统找不到指定的文件”。

EDIT:

我忘了告诉你，我已经设置了我的远程计算机和服务器，使其不会无法相互连接，例如关闭防火墙，配置本地系统策略以及更改网络和共享中心。

// 远程关机

    public bool RemoteShutdown(string userName, string password, string ip)
    {
        try
        {
            ConnectionOptions op = new ConnectionOptions();
            op.Username = userName;
            op.Password = password;
            // Make a connection to a remote computer.  
            ManagementScope scope = new ManagementScope("\\\\" + ip + "\\root\\cimv2", op);
            scope.Connect();
            //Query system for Operating System information  
            ObjectQuery oq = new ObjectQuery("SELECT * FROM Win32_OperatingSystem");
            ManagementObjectSearcher query = new ManagementObjectSearcher(scope, oq);
            ManagementObjectCollection queryCollection = query.Get();
            foreach (ManagementObject obj in queryCollection)
            {
                obj.InvokeMethod("ShutDown", null); //shutdown  
            }

            return true;
        }
        catch (Exception)
        {
            return false;
        }
    }

// 远程重启

    public bool RemoteReboot(string userName, string password, string ip)
    {
        try
        {
            ConnectionOptions op = new ConnectionOptions();
            op.Username = userName;
            op.Password = password;
            // Make a connection to a remote computer.  
            ManagementScope scope = new ManagementScope("\\\\" + ip + "\\root\\cimv2", op);
            scope.Connect();
            //Query system for Operating System information  
            ObjectQuery oq = new ObjectQuery("SELECT * FROM Win32_OperatingSystem");
            ManagementObjectSearcher query = new ManagementObjectSearcher(scope, oq);
            ManagementObjectCollection queryCollection = query.Get();
            foreach (ManagementObject obj in queryCollection)
            {
                obj.InvokeMethod("Reboot", null); //shutdown  
            }

            return true;
        }
        catch (Exception)
        {
            return false;
        }
    }