Question

public static void Map<T>(Expression<Func<T, object >> expression)
{
    var memberExpression = (expression.Body as UnaryExpression).Operand as MemberExpression;
    var name = memberExpression.Member.Name;
}

Usage:

Map<Article>(x => x.Name)

Name is of type string.

How do I get the type?

Answer 1

var returnType = memberExpression.Member is MethodInfo 
    ? ((MethodInfo)memberExpression.Member).ReturnType 
    : ((PropertyInfo)memberExpression.Member).PropertyType;

I assume you want the return type. If you want the type on which the method is defined, use memberExpression.Member.DeclaringType.