Cannot implicitly convert type 'System.Collections.Generic.List' to 'System.Linq.IQueryable'

Question

I am trying to create a query in my domain service (VS 2010 Silverlight Business Application) that returns the results from inspection readings that came out as a specific value

Answer 1

The problem is precisely because you've called ToList(). You've declared that you're returning IQueryable, and List doesn't implement IQueryable.

Options (pick one):

• Remove the ToList call
• Change the return type to IEnumerable, IList or possibly List

• Call AsQueryable() after ToList():

  ... as before ...
  .ToList().AsQueryable();
  

Note that you don't need the type argument in the ToList call - it's the same one that the compiler would infer anyway.