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Code Analyzer based on Omnisharp

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Why is this an issue?
The ServiceContract attribute specifies that a class or interface defines the communication contract of a Windows Communication
Foundation (WCF) service. The service operations of this class or interface are defined by OperationContract attributes added to methods.
It doesn’t make sense to define a contract without any service operations; thus, in a ServiceContract class or interface at least one
method should be annotated with OperationContract. Similarly, WCF only serves OperationContract methods that are defined
inside ServiceContract classes or interfaces; thus, this rule also checks that ServiceContract is added to the containing
type of OperationContract methods.
Noncompliant code example
[ServiceContract]
interface IMyService // Noncompliant
{
  int MyServiceMethod();
}

Compliant solution
[ServiceContract]
interface IMyService
{
  [OperationContract]
  int MyServiceMethod();
}