Question

What is one-way operation in WCF?

Answer 1

When an operation has no return value, and the client does not care about the success or failure of the invocation. WCF offers one-way operations to support this sort of fire-and-forget invocation,: once the client issues the call, WCF generates a request message, but no correlated reply message will ever return to the client. The one-way message exchange pattern is useful when a client needs to send information to a service but doesn't receive a response.

Use the one-way design pattern:

• When the client must call operations and is not affected by the result of the operation at the operation level.
• When using the NetMsmqBinding or the MsmqIntegrationBinding class. (For more information about this scenario, see Queues in Windows Communication Foundation.)

To create a one-way service contract, define your service contract, apply the OperationContractAttribute class to each operation, and set the IsOneWay property to true, as shown in the following sample code.

[ServiceContract(Namespace = "http://Microsoft.ServiceModel.Samples")]
public interface IOneWayCalculator
{
    [OperationContract(IsOneWay = true)]
    void Add(double n1, double n2);
    [OperationContract(IsOneWay = true)]
    void Subtract(double n1, double n2);
    [OperationContract(IsOneWay = true)]
    void Multiply(double n1, double n2);
    [OperationContract(IsOneWay = true)]
    void Divide(double n1, double n2);
}