Get the original nameof(…) of a variable?

Question

I have this

public static class Parameters
{
    public static void Required(this T parameter, string paramName) where T : class
    {
        if (param         


        

Answer 1

You could make the Requred-function accepting a Expression. And from the expression you can read out the name of the member name. It's descriped here.

    public static void Required<T>(Expression<Func<T>> parameter) where T : class
    {
        if (parameter.Compile().Invoke() == null)
        {
            var caller = ((MemberExpression)parameter.Body).Member.Name;
            throw new ArgumentNullException(caller);
        }

        // ...
    }

and call it like this:

Parameters.Required(() => settings);