LINQ Join with Multiple Conditions in On Clause

Question

I\'m trying to implement a query in LINQ that uses a left outer join with multiple conditions in the ON clause.

I\'ll use the example of the following two tables

Answer 1

You can't do it like that. The join clause (and the Join() extension method) supports only equijoins. That's also the reason, why it uses equals and not ==. And even if you could do something like that, it wouldn't work, because join is an inner join, not outer join.