Get string property name from expression

Question

I\'m trying to write a strongly typed helper which would be something like this:

Html.Lookup(x => x.FooId);

for now I have this:

Answer 1

public static class ExpressionsExtractor
{
    public static string Lookup(this HtmlHelper html, Expression> expression)
    {
        var memberExpression = expression.Body as MemberExpression;

        if (memberExpression == null)
            return null;

        return memberExpression.Member.Name;
    }
}

You would then call it with:

var propName = Html.Lookup(x => x.FooId);