Solved

call function in a linq query

Posted on 2014-02-06
5
1,832 Views
Last Modified: 2016-02-10
hi there

i need to call a func inside the linq query my code is this ;
  public List<exlids> GetLeadByID(long lidid)
        {
            using (EF.lidsDBEntities ef = new EF.lidsDBEntities())
            {
                //var lid = ef.Lids.Where(l => l.Lid_Id == lidid).SingleOrDefault();
                //return lid;

                var lid = from l in ef.Lids
                          join c in ef.Customers
                          on l.CID equals c.CID
                          where l.Lid_Id == lidid
                          select new exlids
                          {
                              lidExs = l,
                              cust_name = c.Cust_Name,
                              cust_phone = c.Cust_Phone,
                              lead_his = GetLidHistory(c.CID) // here its faild   
                      };
                return lid.ToList();

            }
        }
        public string GetLidHistory(long cid)
        {
            string his = string.Empty;
            using (EF.lidsDBEntities ef = new EF.lidsDBEntities())
            {
                var history = ef.GetLidHistory(cid);
                foreach (var item in history)
                {
                    his += item.Lid_Id.ToString() + ' ' + item.lid_open_date.ToString() + "\n\n" + item.lid_Desc +"\n\n";
                }
                return his;
            }
        }
    }

Open in new window


i am getting this Exsption :
: LINQ to Entities does not recognize the method 'System.String GetLidHistory(Int64)' method, and this method cannot be translated into a store expression.

how can i fix that ?
thanks ...
0
Comment
Question by:Tech_Men
  • 3
  • 2
5 Comments
 
LVL 62

Accepted Solution

by:
Fernando Soto earned 500 total points
ID: 39840113
Hi Tech_Men;

What you want to do is NOT possible. The reason is that the query gets translated into TSQL and in TSQL there is no GetLidHistory function to translate to. You need to remember that the TSQL get executed at the server and has no access to your local code. The only way to do this is to bring the data down to the local machine then run a query on the results of the Linq to EF or Linq to SQL locally where you can call local functions.
0
 

Author Closing Comment

by:Tech_Men
ID: 39840129
thanks...
0
 
LVL 62

Expert Comment

by:Fernando Soto
ID: 39840138
Not a problem Tech_Men, glad I was able to help.
0
 

Author Comment

by:Tech_Men
ID: 39840165
i just change it like that and its work fine :

 using (EF.lidsDBEntities ef = new EF.lidsDBEntities())
            {
                var cid = ef.Lids.Where(li => li.Lid_Id == lidid).Select(s => s.CID).ToList().SingleOrDefault();
                string his = GetLidHistory(cid);
                var lid = from l in ef.Lids
                          join c in ef.Customers
                          on l.CID equals c.CID
                          where l.Lid_Id == lidid
                          select new exlids
                          {
                              lidExs = l,
                              cust_name = c.Cust_Name,
                              cust_phone = c.Cust_Phone,
                              lead_his = his
                          };
                return lid.ToList();

            }
        }

Open in new window

0
 
LVL 62

Expert Comment

by:Fernando Soto
ID: 39840220
Very good.
0

Featured Post

DevOps Toolchain Recommendations

Read this Gartner Research Note and discover how your IT organization can automate and optimize DevOps processes using a toolchain architecture.

Question has a verified solution.

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

This article shows how to deploy dynamic backgrounds to computers depending on the aspect ratio of display
This article aims to explain the working of CircularLogArchiver. This tool was designed to solve the buildup of log file in cases where systems do not support circular logging or where circular logging is not enabled
This Micro Tutorial will teach you how to censor certain areas of your screen. The example in this video will show a little boy's face being blurred. This will be demonstrated using Adobe Premiere Pro CS6.
In this video I am going to show you how to back up and restore Office 365 mailboxes using CodeTwo Backup for Office 365. Learn more about the tool used in this video here: http://www.codetwo.com/backup-for-office-365/ (http://www.codetwo.com/ba…

867 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

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now