C# WCF访问Windows服务错误

我有一个web应用程序asp.net，它调用WCF C。WCF调用Windows服务来执行任务。不幸的是，当WCF调用windows服务时，我得到的错误是

无法在计算机“”上打开appservice服务

WebApp、WCF和appservice都是Windows 2012的同一台机器。WebApp、WCF和appservice正在添加到管理员组的帐户acctname下运行

appservice正在运行，只是WCF无法调用appservice。 你知道怎么解决这个问题吗

下面是WCF中的示例代码，它调用windows服务appservice

try 
{
    string serviceName = "appservice ";
    ServiceController niuService = new ServiceController(serviceName);
    niuService.MachineName = ConfigurationManager.AppSettings["SERVICE_MACHINE_NAME"];

    if (niuService == null)
    {
        returnObject.IsSuccessful = false;
        returnObject.MessageCollection.Add(new Message{Description = "Service <" + serviceName +
                        "> ON Machine <" + niuService.MachineName + "wasn't found when starting fl"});
    }
    else if (niuService.Status != ServiceControllerStatus.Running)
    {
        returnObject.IsSuccessful = false;
        returnObject.MessageCollection.Add(new Message{Description = "Service <" + serviceName +
                        "> wasn't running when starting fl"});
    }
    else
    {
        niuService.ExecuteCommand((int)ServiceCustomCommands.START_FL);
        returnStatus = true;
        returnObject.IsSuccessful = true;
        returnObject.BusinessObject = true;
    }
}

---

Windows服务通常不是交互式应用程序。你能提供更多的信息，或者一些代码示例来说明你想要实现的目标吗？请提供更多信息：你如何准确地调用Windows服务？你得到了什么确切的错误？我用每个请求的示例代码更新了我的帖子。你能发布相关的Windows服务代码吗？您是否覆盖了服务中的OnCustomCommand？我还添加了相关的windows服务代码？

  protected override void OnCustomCommand(int command)
        {
            base.OnCustomCommand(command);
            EventLogEntryType status = EventLogEntryType.Information;
            bool cmdUnknown = false;
            bool resp = false;

            switch (command)
            {
                case (int)ServiceCustomCommands.CHECK_DB_CONN:
                    resp = ApiFlashing.Instance.CheckDBconnection();
                    break;
                case (int)ServiceCustomCommands.START_FL:
                    resp = flON = ApiFlashing.Instance.StartFlashing(0);  
                    break;


//remaining code comes here