Cast return type in postsharp

Question

I want to use PostSharp follow code:

class Program
{
    [PostModerator]
    public static ReturnState<Person> GetPerson()
    {
        return new ReturnState<Person>() { Result = new Person { Id = 2, Name = "Gholzam" }, Succeed = true };
    }

    static void Main(string[] args)
    {
        var personAttempt= GetPerson();
        Console.WriteLine("Test ok");
        Console.ReadKey();
    }
}

in PostModerator I use follow code:

[Serializable]
public class PostModeratorAttribute : OnMethodBoundaryAspect
{
    public override void OnEntry(MethodExecutionArgs args)
    {
        args.ReturnValue = new ReturnState<object> { Succeed=false };//Star
        args.FlowBehavior = FlowBehavior.Return;

        for (int counter = 0; counter < args.Arguments.Count; counter++)
        {
            Console.WriteLine("arg{0} is {1}",counter,args.Arguments[counter]);
        }
        Console.WriteLine("On Entry");
    }
}

I have cast exception when I return new ReturnState<object>.. and Postshop try cast to ReturnState<Person> but can't.

Answer 1

Yes, that's because you're creating a ReturnState<object>, which isn't a ReturnState<Person>.

Options:

• Change your PostModerateAttribute to find out the correct return type, and create an instance of that instead.
• Hard-code PostModerateAttribute to return ReturnState<Person>
• Change the return type (and expression) of your object to ReturnState<object>