LINQ to SQL dynamic WHERE clause mulitple JOIN

[Jay Douglas]

Hello,

I've found some posts on creating dynamic WHERE clauses in LINQ to SQL using
predicate builders and extending lamda expressions. One issue with these
posts is all the examples only use a single customer table. I'm need a way
to dynamically create a where clause using multiple tables. None of the
tables I'm using have references in the LINQ designer so the JOIN operator
is required.

If I were to hard type out the query in linq it would look like: (Just an
example, I don't have the NWind schema in front of me)

var query = from c in db.Customers join o in db.Orders on c.CustomerId
equals o.CustomerId where c.LastName.Contains("Last") && o.OrderDate > new
DateTime("1/1/2001") select c;

I'm looking for some direction on dynamically setting the where predicates.

Any and all suggestions and GREATLY appreciated.

Many thanks in advance.

Jay Douglas