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

a bit late but I am posting a simple solution that's working for me in .Net 4. It has handling for value types on line 4

public PropertyInfo GetPropertyInfo(Expression> propertyLambda) {
        var member = propertyLambda.Body as MemberExpression;
        if (member == null) {// value types return Convert(x.property) which can't be cast to MemberExpression
            var expression = propertyLambda.Body as UnaryExpression;
            member = expression.Operand as MemberExpression;
        }
        return member.Member as PropertyInfo;
    }