Question

I’ve implemented a simple extension method in my asp.net mvc 3 app to pull objects out of session using generics:

public static T GetVal<T>(this HttpSessionStateBase Session, string key, Func<T> getValues)
    {
        if (Session[key] == null)
            Session[key] = getValues();

        return (T)Session[key];
    }

This works great if getValues() doesn’t require any arguments.

I was attempting to write an overload that takes in params object[] args to allow me to pass arguments if necessary to the getValues() function, but I don’t know what the syntax is to apply those variables to the function.

Is this even possible? Thanks in advance for your advice.

Answer 1

I would argue that you shouldn’t need to do this – the caller can handle that with a lambda expression. For example:

int x = session.GetVal<int>("index", () => "something".IndexOf("o"));

Here we’re capturing the idea of calling IndexOf on "something" passing in the argument "o". All of that is captured in a simple Func<int>.