How to inner join tables from different Data Context? [duplicate]

Answer 1

Another solution is change the result to List().

var query = (from a in dc1.TableA 
            join b in dc2.TableB on a.id equals b.id 
            select new { a, b }).ToList()

Answer 2

If your code does something along the lines of:

from a in dc1.TableA
join b in dc2.TableB on a.id equals b.id
select new { a, b }

...just change it to:

from a in dc1.TableA
join b in dc1.GetTable<TableB>() on a.id equals b.id
select new { a, b }

The L2S datacontext uses the attributes on the class, so if you use GetTable on another datacontext than the one the table is attached to it will just pick up the table, column, etc attributes from the class def and use it as if it was part of the DC you're using in the query...

Answer 3

You don't. The data contexts may have inconsistent views of the database.