Linq to Entities - SQL “IN” clause

Question

In T-SQL you could have a query like:

SELECT * FROM Users WHERE User_Rights IN (\"Admin\", \"User\", \"Limited\")

How would you replicate t

Answer 1

I will go for Inner Join in this context. If I would have used contains, it would iterate 6 times despite if the fact that there are just one match.

var desiredNames = new[] { "Pankaj", "Garg" }; 

var people = new[]  
{  
    new { FirstName="Pankaj", Surname="Garg" },  
    new { FirstName="Marc", Surname="Gravell" },  
    new { FirstName="Jeff", Surname="Atwood" }  
}; 

var records = (from p in people join filtered in desiredNames on p.FirstName equals filtered  select p.FirstName).ToList(); 

Disadvantages of Contains

Suppose I have two list objects.

List 1      List 2
  1           12
  2            7
  3            8
  4           98
  5            9
  6           10
  7            6

Using Contains, it will search for each List 1 item in List 2 that means iteration will happen 49 times !!!