Self Hosting WCF Service

For WCF Self hosting we need to do the following things

1>Create a WCF Service Library

2>Delete the service class and service interface[IService.cs,Service.cs]

3>Delete the service tag from the App.config file.

4>Right click on ServiceApp=>Add New Item=>From the item panel choose Wcf Service

5>Now run the services

5>Create a Console Application to Host the services

6>Add the following code for hosting the services

//Create a URI to serve as the base address Uri httpUrl = new Uri("http://localhost:8732/Design_Time_Addresses/AppServices/MyService"); //Create ServiceHost ServiceHost host = new ServiceHost(typeof(AppServicess.MyService), httpUrl); //Add a service endpoint host.AddServiceEndpoint(typeof(AppServicess.IMyService), new WSHttpBinding(), ""); //Enable metadata exchange ServiceMetadataBehavior smb = new ServiceMetadataBehavior(); smb.HttpGetEnabled = true; host.Description.Behaviors.Add(smb); //Start the Service host.Open(); Console.WriteLine("Service is host at " + DateTime.Now.ToString()); Console.WriteLine("Host is running... Press <Enter> key to stop"); Console.ReadLine();

7>Add the references as service project and System.Servicemodel.

8>Now set the Host application as "Set As Start Up Project".

9>Now create a client to consume the services

10>Add the Service References

11>Now run the client application

How to check Session in WCF

To check the session in WCF we need to do the following things

1>Add the following line in the service class

[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession)]

2>Expose a method which increment a value to check the session

[ServiceBehavior(InstanceContextMode=InstanceContextMode.PerSession)] public class MyService : IMyService { public int i; public int MyMethod() { i++; return i; } }

3>Now consume the expose method from client

ClientProxy.MyServiceClient proxy=new ClientProxy.MyServiceClient(); Console.WriteLine("Client is running at " + DateTime.Now.ToString()); Console.WriteLine("Counter: " + proxy.MyMethod()); Console.WriteLine("Counter: " + proxy.MyMethod()); Console.WriteLine("Counter: " + proxy.MyMethod()); Console.WriteLine("Counter: " + proxy.MyMethod()); ClientProxy.MyServiceClient proxy1=new ClientProxy.MyServiceClient(); Console.WriteLine("Counter: " + proxy1.MyMethod()); Console.WriteLine("Counter: " + proxy1.MyMethod()); Console.WriteLine("Counter: " + proxy1.MyMethod()); Console.WriteLine("Counter: " + proxy1.MyMethod()); Console.ReadLine();

Generated Output

Conclusion

Here for different client proxy instances, value is incremented by one.So from output we can understand at service end for different client proxy new service instance is created but for same client proxy the same service instance is used.

Note:If service is not running properly then we can do one thing. First we need to open the project in two visual studio. In one editor set the Host application as Start Up Project and run it, in other editor set client as Set Up Project and run it.

How to implement Fault Exception in WCF

To implement Fault Exception in WCF we need to first define the fault contract in service contract

[ServiceContract] public interface IMyService { [OperationContract()] [FaultContract(typeof(CustomException))] int Devide(int num1, int num2); }

Secondly define the service class with Fault Exception

public int Devide(int num1, int num2) { try { return num1 / num2; } catch(Exception ex1) { CustomException ex = new CustomException(); ex.Title = "Error Funtion:Add()"; ex.ExceptionMessage = "Error occur while doing add function."; ex.InnerException = "Inner exception message from serice"; ex.StackTrace = "Stack Trace message from service."; //throw new FaultException<CustomException>(ex,new FaultReason(ex.ExceptionMessage)); FaultException<CustomException> fe = new FaultException<CustomException>(ex, new FaultReason(ex.ExceptionMessage)); throw fe; } } [DataContract()] public class CustomException { [DataMember()] public string Title; [DataMember()] public string ExceptionMessage; [DataMember()] public string InnerException; [DataMember()] public string StackTrace; }