WCF Interview Questions and Answers (172)

Yes, a struct can be used as a DataContract. For example :-

[DataContract]

struct EmployeeInfo

{

[DataMember]

public int id;



[DataMember]

public string name;



[DataMember]

public DateTime joining_date;

}

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Akiii

No, SOAP envelope is not created in WebHttpBinding . The information is trasmitted through HTTP or HTTPS.



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Akiii

NetNamedPipesBinding binding is used.



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Akiii

ServiceHost s = new ServiceHost(typeof(EmployeeReservations));

s.AddEndpoint(typeof(EmployeeReservations), new BasicHttpBinding(),

"http://www.google.com/employee/emp.svc");

EmployeeReservations is the name of the contract.
http://www.google.com/employee/emp.svc is the address of the web service.



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Akiii

Even though defining endpoints programmatically is possible, the most common approach
today is to use a configuration file associated with the service. Endpoint definitions embedded in code are difficult to change when a service is deployed, yet some endpoint characteristics, such as the address, are very likely to differ in different deployments. Defining endpoints in config files makes them easier to change, since changes don?t require modifying and recompiling the source code for the service class.



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Akiii

Configuration information for all services implemented by a WCF-based application is
contained within the system.serviceModel element. This element contains a services element that can itself contain one or more service elements.



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Akiii

To encrypt sensitive data in WCF configuration file, use aspnet_regiis.exe tool.

Example: If you want to encrypt Connection String section of WCF config file, use -pe that means provider encryption .

aspnet_regiis -pe "connectionStrings" -app "/MachineDPAPI" 

-prov "DataProtectionConfigurationProvider" 

-pe means provider encryption of configuration section.
-app means your application's virtual path.
-prov means provider name

For more info: http://msdn.microsoft.com/en-us/library/k6h9cz8h(VS.80).aspx

WCF Data Services are used when you want to expose your data model and associated logic through a RESTful interface. It includes a full implementation of the Open Data (OData) Protocol for .NET to make this process very easy.

WCF Data Services was originally released as ‘ADO.NET Data Services’ with the release of .NET Framework 3.5.



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Akiii

WCF One Way Contract are methods/operations which are invoked on the service by the client or the server in which either of them do not expect a reply back. For example :-

If a client invokes a method on the service then it will not expect a reply back from the service.



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Akiii

One way contract is used to ensure that the WCF client does not go in a blocking mode . If your WCF operation contracts are returning nothing and they are doing some heavy process then it is better to use one way contract.




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Akiii