protected override Expression VisitMember(MemberExpression node)
{
if (!AttributesHelper.IsAttributesClass(node.Member.DeclaringType))
{
throw new NotSupportedException();
}
var attributeName = node.ToString();
if (!_attributes.ContainsKey(attributeName))
{
throw new AttributeMissingException(attributeName);
}
return(Expression.Constant(_attributes[attributeName]));
}