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Contracts in WCF
A contract is an agreement between two parties. It defines how a client should communicate with your service. In other words a contract is a platform and standard way of describing what the service does. There are the following four types of contracts in WCF Service Contract :
- Service contract
- Data Contract
- Operation Contract
- Fault Contract
- Message Contract
we've already used Data Contract and Operation Contract.
Fault Contract
In WCF (Windows Communication Foundation), we will not expose exception directly to client if it occurs at service level. Fault Contract is used to return error details to the other party i.e. client.
Message Contract
DataContract has limited control over the SOAP message and all that control is related to contents inside body of the SOAP message. But there are scenarios, when we need more control over SOAP message. So, MessageContract is the answer in such cases.
Tutorial
Exercice on Fault Contract
Create a simple calculator service with Add operation which throw general exception and send exception information from service to client with FaultException.