CODEWITHSUNDEEP
c#sqlasp.netlinq
mazhar
mazhar

Reputation: 85

Join multiple tables and single output using Entity Framework mvc5

I am very new to linq query so I need to join multiple tables and single output using Entity Framework mvc5

Below is my 3 table structures and Table_Application is a main table

1) Table_Application

Id   ApplicationName    ServiceId     ProductID

1         Myapp           1               1

2) Table_Service

ServiceId     SName
  1             S1

3) Table_Product

ProductID     PName
  1             P1

I need linq out result data in linq list base on Table_Application ID

ApplicationName   SName   PName
 Myapp             S1      P1

my sql query some thing like that 

select t1.ApplicationName,t2.SName,t3.PName from Table_Application t1,Table_Service t2,Table_Product t3 where t1.ServiceId =t2.ServiceId  and t1.ProductID=t3.ProductID and t1.Id="mysessionid"

I tried for single table coming but not able to join Table_Service and Table_Product

  var IA = db.Applications
      .Where(x => x.ID == Id)
      .Select(IAview => new IAViewModel 
      {
          ApplicationName = IAview.ApplicationName


      }).ToList();

Upvotes: 4

Views: 8738

Answers (2)

Gareth Lewis
Gareth Lewis

Reputation: 76

Take a look at the LINQ query syntax - it's similar to SQL so can be easier to understand if you're coming from that sort of background.

There's a tutorial on http://www.tutorialsteacher.com/linq/linq-query-syntax which will give you a basic starting point, then you can just add in joins etc as required.

Note that the following is untested and will give you a list of IAViewModel objects, but I think you would want something similar to the following:

var a = (from app in db.Applications
join service in db.Services on app.ServiceId equals service.ServiceId
join product in sb.Products on app.ProductId equals product.ProductId
where app.Id == session_id
select new IAViewModel
{
    ApplicationName = app.ApplicationName,
    ServiceName = service.SName,
    ProductName = product.PName
}).ToList();

If you only want a single result out of it, you can leave out the .ToList() and instead use something like .FirstOrDefault()

Upvotes: 4

Dilip
Dilip

Reputation: 21

 var T = db.Table_Application.Join(
                    db.Table_Service,
                    TA=> TA.ServiceId,
                    TS => TA.ServiceId,
                    (TA,TS ) => new { TA, TS }
                    ).Join(
                    db.Table_Product,
                    TA2=> TA2.TA.ProductID,
                    TP => TP.ProductID,
                    (TA2, TP) => new { TA2, TP }
                    ).Where(c => c.TA.Id == "mysessionid").FirstOrDefault();

Upvotes: 2

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