Question

How can one determine if a ParameterInfo is a Return Parameter?

I wrote the function below, but I’m concerned that I may be missing something:

public bool IsReturnParameter(ParameterInfo parameter){
    var method = parameter.Member as MethodInfo;
    return method != null && parameter.Equals(method.ReturnParameter);
}

I am basing this on a couple assumptions, which may be flawed: (1) Parameters are declared on members that are MethodInfo, ConstructorInfo or PropertyInfo (indexers). (2) ConstructorInfo and PropertyInfo will never have a return parameter.

Answer 1

You could check if the ParameterInfo.Position == -1…but your equality check seems equally as good…though it won’t correctly handle overrides or interfaces or generic types in some cases.