WCF.Net MCQ, Dot Net Question and Answers, .NET Quiz

WSFederationHttpBinding is used with federated security and also transaction support of web services in WCF.

WSDualHttpBinding supports both duplex contract as well as transaction support in WCF.

BasicHttpBinding is the default binding in WCF. We can change it in the section of WCF service.

Data Contract is used to define the coming and going data types in a service which may be implicit or explicit. It is used for transporting and receiving the object data between the WCF client and WCF service.

Operation Contract is the WCF attribute used to define a methods of a class/interface/service which are accessible by external systems.

Service Contract is the WCF attribute used to define a class or interface. It also describes the service provider’s operation.

WCF service has .SVC extension. When we create ant WCF service,then default extension would be .svc. WCF is an advanced version of Web-service as it deals with tcp/ip,named-pipe as well.It’s full form is Windows Communication Foundation.We have a OperationContract attribute for Interface.

TCP Binding is mainly used for cross machine communication.

Used system$DeadXact for read messages from a system transactional dead-letter queue, where /system$DeadLetter for read messages from a system non-transactional dead-letter queue.

Apply an OperationContract Attribute to each method to expose the desire functionality

Encoding (Text, binary, Message Transmission Optimization Mechanism (MTOM), custom) and Transport (TCP, HTTP, HTTPS, named pipes,P2P,MSMQ, Custom) both are required, while remaining are optional

Identified the no of rejected messages for the service. Calls Faulted or Calls Faulted per second performance object, track Number of calls that returned as faults.

Named pipe binding uses named pipe as transport for same machine communication using an efficient binary encoding method. Basic binding exposes a service like an prior asmx web service

httpGetEnabled property is part of serviceMetadata element set true. So client can access your service metaData. behaviors element contains all behaviors related to a service.

At a minimum, you will nned the ServiceContractAttribute to declare the contract and OperationcontractAttribute to declare any operations in that service contract.

Binary is used for Speed, MTOM is used for Large data, Text is used for interoperability.

WCF binds an incoming message request to a particular service instance, It is necessary because application’s needs are different.

You can create a WCF data services data access layer in only a few minutes. ASP.NET web service that provided access to an underlying database, it would require far more programming than using WCF data services.

WCF web services provide a great deal of flexibility, and they support using multiple binding types.

Messaging pattern describe how programs exchange messages with service, it must conform to one of Simplex, Duplex and Request Reply patterns in order for it to successfully communicate with the destination program.