What is the syntax for an inner join in LINQ to SQL?

Question

I\'m writing a LINQ to SQL statement, and I\'m after the standard syntax for a normal inner join with an ON clause in C#.

How do you represent the follo

Answer 1

To extend the expression chain syntax answer by Clever Human:

If you wanted to do things (like filter or select) on fields from both tables being joined together -- instead on just one of those two tables -- you could create a new object in the lambda expression of the final parameter to the Join method incorporating both of those tables, for example:

var dealerInfo = DealerContact.Join(Dealer, 
                              dc => dc.DealerId,
                              d => d.DealerId,
                              (dc, d) => new { DealerContact = dc, Dealer = d })
                          .Where(dc_d => dc_d.Dealer.FirstName == "Glenn" 
                              && dc_d.DealerContact.City == "Chicago")
                          .Select(dc_d => new {
                              dc_d.Dealer.DealerID,
                              dc_d.Dealer.FirstName,
                              dc_d.Dealer.LastName,
                              dc_d.DealerContact.City,
                              dc_d.DealerContact.State });

The interesting part is the lambda expression in line 4 of that example:

(dc, d) => new { DealerContact = dc, Dealer = d }

...where we construct a new anonymous-type object which has as properties the DealerContact and Dealer records, along with all of their fields.

We can then use fields from those records as we filter and select the results, as demonstrated by the remainder of the example, which uses dc_d as a name for the anonymous object we built which has both the DealerContact and Dealer records as its properties.