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Why is this an issue?
When declaring a Windows Communication Foundation (WCF) OperationContract
method as one-way,
that service method won’t return any result, not even an underlying empty confirmation message. These are fire-and-forget methods that are useful in
event-like communication. Therefore, specifying a return type has no effect and can confuse readers.
Exceptions
The rule doesn’t report if OperationContractAttribute.AsyncPattern
is set to true.
How to fix it
Code examples
Noncompliant code example
[ServiceContract]
interface IMyService
{
  [OperationContract(IsOneWay = true)]
  int SomethingHappened(int parameter); // Noncompliant
}

Compliant solution
[ServiceContract]
interface IMyService
{
  [OperationContract(IsOneWay = true)]
  void SomethingHappened(int parameter);
}

Resources
Documentation
Microsoft Learn - OperationContractAttribute