How to make a “connection” in a LINQ query with Entity Framework

Question

I have the following table structure that has been imported into the Entity Framework. I need to write a LINQ query where I select the entities of table 1, where the field in table 2 is true and the field in table 3 is equal to a specific GUID.

Can anyone help with this?

Thank.

alt text http://digitalsamurai.us/images/drawing2.jpg

Answer 1

Try:

from t3 in dataContext.Table3
  where t3.Guidfield == someGuid
  from t2 in t3.Table2
  where t2.Field // boolean field is true
  select t2.Table1;

EDIT: As requested, the equivalent syntax of the lambda expression is:

dataContext.Table3.Where(t3 => t3.Guidfield == someGuid)
              .SelectMany(t3 => t3.Table2)
              .Where(t2 => t2.Field)
              .Select(t2.Table1);

Answer 2

from t1 in table1
join t2 in table2
on t1.table1PK equals t2.table1PK
join t4 in table4
on t2.table2PK equals t4.table2PK
join t3 in table3
on t3.table3PK equals t4.table3PK
where  t2.randomBoolColumn == true && t3.GUID == myGUIDVariable
select t1;