Unable to create a constant value of type 'Anonymous type'

.net, anonymous-types, c#, entity-framework, linq-to-entities

Solution

Are you sure you need a join? What about this:

var t2s = _ent.Products.Where(t => t.Row_Num == 1).Select(t =>t.ProductID);

var _query = _ent.brands.Where(b => t2s.Contains(b.Prod_ID));

You may need to change things slightly depending on whether ProductID and/or Prod_ID are nullable.

Problem

I have two linq queries. I want to use result of one query in another query. ``` var t2s = (from temp3 in _ent.Products where temp3.Row_Num == 2 select new { temp3.ProductID }); ``` Then I use this var in another query: ``` var _query = (from P1 in _ent.brands join temp2 in on new { Produ_ID = (Int32?)P1.Prod_ID } equals new { Produ_ID = (Int32?)temp2.ProductID } ); ``` When I run the first query by itself it gives me the right result. If I run the second one without a `join` it gives me right result, but with a `join` gives me the following error: error: Unable to create a constant value of type 'Anonymous type'. Only primitive types ('such as Int32, String, and Guid') are supported in this context

Original source