Solved

Need LINQ Lambda Entity Frameworks

Posted on 2014-02-15
3
519 Views
Last Modified: 2016-02-10
I am new to LINQ and Entity Frameworks.  I am trying to figure out how to do a join in LINQ and return data in a list.  I am using REST webservices.

I have the following  SQL that returns 18 rows

SELECT
   ClientApp.ClientId,
   ClientApp.AppId,
   ClientApp.ClientAppExpirationDate,
   App.Description
FROM
   ClientApp INNER JOIN App ON ClientApp.AppId = App.AppId
where
   ClientApp.ClientId=1

-----------------------------------
With the help of a colleague I have the following Lambda LINQ that returns the same number of rows in two lists the dates and descriptions match in the same rows. Only problem is I need one list.  Short of creating a third list and going through and putting the data in the row from each list into the new list I am hoping a single LINQ query with the same join can do the job.

using (var context = new  WSContext())
{
//   List<AppList> appList = new List<AppList>();
List<ClientApp> clientAppList = new List<ClientApp>();
List<App> appList = new List<App>();
var app = context.ClientApps.Where(c => c.ClientId == _clientID).Join(context.Apps, ca => ca.AppId, a => a.AppId, (ca, a) =>
      new { clientApp = ca, apps = a });
var resultApps = app.Select(s => s.apps);
var resultClientApp = app.Select(a => a.clientApp );

clientAppList = resultClientApp.ToList();
appList = resultApps.ToList();

-----------------------

}
0
Comment
Question by:Charles Baldo
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 63

Accepted Solution

by:
Fernando Soto earned 500 total points
ID: 39862238
Hi charlesbaldo;

You were not that far off. This code should do what you need.

using (var context = new  WSContext())
{
	   var resultList = context.ClientApp
	                           .Where(c => c.ClientId == _clientID)
	                           .Join(context.Apps, 
	                                 ca => ca.AppId, 
	                                 a => a.AppId, 
	                                 (ca, a) =>  new 
	                                     { 
	                                         ClientId = ca.ClientId,
	                                         AppId = caa.AppId,
	                                         ClientAppExpirationDate = ca.ClientAppExpirationDate,
	                                         Description = a.Description	                                         
	                                     }
	                                 );
}

Open in new window

0
 

Author Closing Comment

by:Charles Baldo
ID: 39862273
Thank you kindly
0
 
LVL 63

Expert Comment

by:Fernando Soto
ID: 39862752
Not a problem Charles, glad to help.
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Exception Handling is in the core of any application that is able to dignify its name. In this article, I'll guide you through the process of writing a DRY (Don't Repeat Yourself) Exception Handling mechanism, using Aspect Oriented Programming.
How to leverage one TLS certificate to encrypt Microsoft SQL traffic and Remote Desktop Services, versus creating multiple tickets for the same server.
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…

734 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question