WCF SDK Interview Questions and Answers

1 :: How to deal with operation overloading while exposing the WCF services?

By default overload operations (methods) are not supported in WSDL based operation. However by using Name property of OperationContract attribute, we can deal with operation overloading scenario.

[ServiceContract]

interface ICalculator

{

[OperationContract(Name = "AddInt")]

int Add(int arg1,int arg2);



[OperationContract(Name = "AddDouble")]

double Add(double arg1,double arg2);

}



Notice that both method name in the above interface is same (Add), however the Name property of the OperationContract is different. In this case client proxy will have two methods with different name AddInt and AddDouble.

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2 :: How to set the timeout property for the WCF Service client call?

The timeout property can be set for the WCF Service client call using binding tag.

<client>

<endpoint

...

binding = "wsHttpBinding"

bindingConfiguration = "LongTimeout"

...

/>

</client>

<bindings>

<wsHttpBinding>

<binding name = "LongTimeout" sendTimeout = "00:04:00"/>

</wsHttpBinding>

</bindings>



If no timeout has been specified, the default is considered as 1 minute.

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3 :: How to configure Reliability while communicating with WCF Services?

Reliability can be configured in the client config file by adding reliableSession under binding tag.

<system.serviceModel>

<services>

<service name = "MyService">

<endpoint

address = "net.tcp://localhost:8888/MyService"

binding = "netTcpBinding"

bindingConfiguration = "ReliableCommunication"

contract = "IMyContract"

/>

</service>

</services>

<bindings>

<netTcpBinding>

<binding name = "ReliableCommunication">

<reliableSession enabled = "true"/>

</binding>

</netTcpBinding>

</bindings>

</system.serviceModel>



Reliability is supported by following bindings only

NetTcpBinding
WSHttpBinding
WSFederationHttpBinding
WSDualHttpBinding

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4 :: What is Transport and Message Reliability?

Transport reliability (such as the one offered by TCP) offers point-to-point guaranteed delivery at the network packet level, as well as guarantees the order of the packets. Transport reliability is not resilient to dropping network connections and a variety of other communication problems.

Message reliability deals with reliability at the message level independent of how many packets are required to deliver the message. Message reliability provides for end-to-end guaranteed delivery and order of messages, regardless of how many intermediaries are involved, and how many network hops are required to deliver the message from the client to the service.

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5 :: What are different elements of WCF Srevices Client configuration file?

WCF Services client configuration file contains endpoint, address, binding and contract. A sample client config file looks like

<system.serviceModel>

<client>

<endpoint name = "MyEndpoint"

address = "http://localhost:8000/MyService/"

binding = "wsHttpBinding"

contract = "IMyContract"

/>

</client>

</system.serviceModel>

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