Question

I use EF 4.1 where three tables are mapped in a m-n relationship. I am new to Linq so this will be an easy one for most of you.

The tables are Users -> Users_Rights_Map -> Rights

…a classic m-n.

I’d like to find all users that have a RightID of 1, for example.

  var r = from u context.Users 
  where u.Rights.Select(r => r.RightID == 1)
  select u;

…doesn’t work.

What does the correct LINQ query look like?

Answer 1

Your query syntax is wrong (in is not in your query) and you should use some conditional function for making condition not using select.

var r = from u in context.Users 
  where u.Rights.Any(r => r.RightID == 1)
  select u;

Edit: for linq startup and training I think is good for you to see 101 linq sample.
For Any You can see Quantifiers, there are samples, like Any, All. Specially your case included there.