Question

I have a database where the tables are:

Table1:
Table1Id int

Table2:
Table2Id int
ForeignKeyToTable1 int

LookupTable:
Table2Id
Table3Id

Table3:
Table3Id int
Table3Field varchar

I want to:

select table1.* from table1
inner join table2 on table1.Table1Id = ForeignKeyToTable1 
inner join LookupTable on LookupTable.Table2Id = table2.Table2Id 
inner join Table3 on table3.Table3Id = LookupTable.Table3Id
where table3.Table3Field ='qwerty'

How can this be achieved in Linq?

Answer 1

var query = 
            from table1 in db.Table1
            join table2 in db.Table2 on new { Table1Id = table1.Table1Id } equals new { Table1Id = table2.ForeignKeyToTable1 }
            join lookuptable in db.LookupTable on table2.Table2Id equals lookuptable.Table2Id
            join table3 in db.Table3 on lookuptable.Table3Id equals table3.Table3Id
            where
              table3.Table3Field == "qwerty"
            select new {
              table1.Table1Id
            };