LINQ query with Distinct and Union

Question

I currently have 2 queries that are returning lists of MyModel like this:

var q1 = ....
         select new MyModel()
         {
             TheData1 = ...
         


        

Answer 1

Union creates an Enumerable with unique values from both collections. In other words, you don't need Distinct.

edit: example of Union here

edit2: forgot that it's not the list of UniqueIDs that you're concatenating. I removed the suggested code since it was wrong. You should be able to do a simple Union if you implement an IEqualityComparer, but that might be overkill.