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LinqToSQL Joins

Posted on 2014-03-10
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Last Modified: 2016-02-10
I'm struggeling with Linq using a single join, but what to do when you have a to use LinqToSQL to join a base entity with many lookups ?

Appointment

Id
ContractId
CustomerId
LocationId
TaskId
EngineerId
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Question by:Dodsworth
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6 Comments
 
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Expert Comment

by:Fernando Soto
ID: 39918682
I am not sure of the question you are asking can you be a little bit more descriptive.
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Author Comment

by:Dodsworth
ID: 39919894
An Appointment from a user perspective might read...

id                    2132
Contract        West Coast
Customer      Mr Simon D Jenkins              
Location        249a Hatton Street, Newtown, York, YO23 8YE
Task               Install new alarm system
Engineer       Mr John Reed

Yet the Appointment table is structured as in my initial post, where each column with an Id suffix joins with a related table that holds the user readable data. eg. Appointment.CustomerId links to Customer.CustomerId where Customer has .CustomerId, .Saluation, .Forname, .Initial, .Surname etc.
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Accepted Solution

by:
Fernando Soto earned 2000 total points
ID: 39920347
Hi Dodsworth;

See if this gives you what you are looking for.

Dim db = New DataContext()

Dim results = From a In db.Appointment _
              Join c In db.Customer On a.CustomerId Equals c.CustomerId _
              Select a, c 

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LVL 1

Author Comment

by:Dodsworth
ID: 39920534
Do I just tag the other joins on like..
Dim db = New DataContext()

Dim results = From a In db.Appointment _
              Join c In db.Customer On a.CustomerId Equals c.CustomerId _
              Join t In db.Task On a.TaskId Equals t.TaskId _
Select a, c, t  

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?
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LVL 64

Expert Comment

by:Fernando Soto
ID: 39920544
As long as a.TaskId is a column in Appointment and t.TaskId is a column in Task then yes.
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LVL 64

Expert Comment

by:Fernando Soto
ID: 39925418
Has that answered your question?
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