Postsharp - Introduced virtual method is called instead overriden method

Question

Aspect looks like this

[Serializable] 
[IntroduceInterface(typeof(ISomeMethod), OverrideAction = InterfaceOverrideAction.Ignore)] 
public class MyAspect: InstanceLevelAspect, ISomeMethod 
{ 
    [IntroduceMember(IsVirtual = true, OverrideAction = MemberOverrideAction.Ignore)] 
    public string SomeMethod() 
    { 
        throw new NotImplementedException(); 
    }

    [OnMethodInvokeAdvice, MulticastPointcut(Targets = MulticastTargets.Method, Attributes = MulticastAttributes.Public)] 
    public void OnInvoke(MethodInterceptionArgs args) 
    { 
        var something = args.Instance as ISomeMethod;

        //here is problem
        string str = something.SomeMethod();

        args.Proceed(); 
    } 
}

When i check it in dotPeek, SomeMethod is introduced and is virtual. Aspect is applied to base class that is in different project as child classes. Problem is when i override this method and OnInvoke interceptor is called, SomeMethod in aspect is actually called with NotImplementedException instead of overriden method. Debugger confirmed i have right instance in args.Instance. How is this possible? Thanks for answer.

Answer 1

This is a bug which is going to be solved in future version of PostSharp solved since PostSharp 4.2.22/4.3.5.

The rest of the original answer:

But there is a workaround.

Let me visualize the code described in the question. The base class in project A would look like this:

[MyAspect]
public abstract class BaseClass
{
    public void InterceptedMethod(string message)
    {
    }
}

The child class in project B reproducing the bug would look like this:

public class ChildClass : BaseClass
{
    public override string SomeMethod()
    {
        return "";
    }
}

The workaround for now is to implement the interface method instead of overriding it.

public class ChildClass : BaseClass, ISomeMethod
{
    public string SomeMethod()
    {
        return "";
    }
}