LINQ To SQL exception: Local sequence cannot be used in LINQ to SQL implementation of query operators except the Contains operator

user_23199 0
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Consider this LINQ To SQL query. It's intention is to take a string[] of search terms and apply the terms to a bunch of different fields on the SQL table:

string[] searchTerms = new string[] {"hello","world","foo"};
List<Cust> = db.Custs.Where(c => 
   searchTerms.Any(st => st.Equals(c.Email))
|| searchTerms.Any(st => st.Equals(c.FirstName))
|| searchTerms.Any(st => st.Equals(c.LastName))
|| searchTerms.Any(st => st.Equals(c.City))
|| searchTerms.Any(st => st.Equals(c.Postal))
|| searchTerms.Any(st => st.Equals(c.Phone))
|| searchTerms.Any(st => c.AddressLine1.Contains(st))
)
.ToList();

An exception is raised:

Local sequence cannot be used in LINQ to SQL implementation of query operators except the Contains() operator

Question: Why is this exception raised, and how can the query be rewritten to avoid this exception?

linq-to-sql linq
4 Answers

Essentially, the error is saying that you are doing a join between two collections, one of which is a database table, and the other is an array. LINQ isn't designed to handle that -- either both need to be in the database, or both in-memory (with a special case exception made when using Contains)

user_127250
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