c# - Running WCF Windows Service as InstanceContextMode.PerCall -

I have a WCF service that is configured to run as a window service but only if it works only If I select from InstanceContextMode to single . When I change it to be PerCall and restore the service, it can not be accessed.

Can anyone explain to me if I have the the context set as a window service to run the WCF service and why is it so? Public class catering sss service: iCTing sSTS service

Update: Hosting code

  [Service Provider (Instance ContactMode = Instant ContaxModePierCall) Strong>  
  private icing SSTS service _cateringSSTService; Private service_serviceHost; Personal Work _ Execution Task; Public Catering SSTServer () {} Public Zero Start () {_executionTask = New Work (Manager Startup); _executionTask.Start (); } Private Zero Manager Startup () {try {_cateringSSTService = New Catering SSTService ()); _serviceHost = New service host (_cateringSSTService); _serviceHost.Open (); } Catch (Exception) {}} Pause Public Null () {if (_serviceHost! = Null & amp; _serviceHost.State! = CommunicationState.Closed) {_serviceHost.Close (); }} Hold (exception) {throw; }}    
 
 
 You are creating a single object and sending it to the Singleton Constructor  ServiceHost . How is this service host supposed to create a new object every call? It can not work  
 If you want PerCall (or Percent or Singleton), you should  type  the  ServiceHost  constructor of your class There is a need to pass so that it can create new installations of this kind on runtime  
  _serviceHost = New service host (type forming (STS service));   
 If you have not forgotten the exception, then the runtime has told you what the problem is. Apply some reasonable error management to future problems.