Linq list sort based on another list
I have two generic list objects, in which one contains ids and and ordering, and the other a bunch of ids with each id in the second list having an id reference to the first list, for example;

        public class OptionType
        {
            public int ID { get; set; }
            public int Ordering { get; set; }
        }
        
        public class Option
        {
            public int ID { get; set; }
            public int Type_ID { get; set; }
        }   

Obviously I can do a simple sort on a list of OptionTypes by doing

        types_list.OrderBy(x=>x.Ordering);
  
Question is though, how could I go about ordering an 'options_list' by utilising the 'Type_ID' on the object which would relate to the ordering of the types_list. As in something like (obviously this isn't valid - but hopefully you will get the idea!)

    options_list.OrderBy(x=>x.Type_ID == types_list.OrderBy(e=>e.Ordering));

Thanks a lot  
Dan
Linq list sort based on another list
===

I have two generic list objects, in which one contains ids and and ordering, and the other a bunch of ids with each id in the second list having an id reference to the first list, for example;

        public class OptionType
        {
            public int ID { get; set; }
            public int Ordering { get; set; }
        }
        
        public class Option
        {
            public int ID { get; set; }
            public int Type_ID { get; set; }
        }   

Obviously I can do a simple sort on a list of OptionTypes by doing

        types_list.OrderBy(x=>x.Ordering);
  
Question is though, how could I go about ordering an 'options_list' by utilising the 'Type_ID' on the object which would relate to the ordering of the types_list. As in something like (obviously this isn't valid - but hopefully you will get the idea!)

    options_list.OrderBy(x=>x.Type_ID == types_list.OrderBy(e=>e.Ordering));

Thanks a lot  
Dan