Question

Problem with LINQ order by and using distinct...

Asked by: si2030

Dear experts,

I am having a problem with a fairly simple LINQ statement where the order by clause is not working. I have found out that this is because I am using "distinct" in the statement. I identified this as the issue from this web site

http://ddkonline.blogspot.com/2007/11/issues-with-linq-order-by-queries-when.html

My statement is below. I note this can be rectified with lambda expressions ala the website above but i have no idea how to implement them in this situation.

Experts how do I modify this statement to make it order by ledger.tran_type??

Kind Regards

Simon

Dim statementInvoices = (From ledger In db.ledgers _
                                         Order By ledger.tran_date _
                                        Where ledger.tran_date <= monthENDDate And ledger.tran_date >= monthSTARTDate And _
                                        ledger.acc_id = "2" And ledger.reconciled <> "Y" And ledger.client_no = clientNo _
                                        Select _
                                        ledger.client_no, _
                                        ledger.acc_id, _
                                        ledger.ref1, _
                                        ledger.tran_type, _
                                        ledger.tran_date, _
                                        ledger.detail, _
                                        ledger.posting_id, _
                                        ledger.link_posting_id, _
                                        ledger.amount).Distinct

                                  
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Asked On
2009-10-13 at 05:27:43ID24807439
Tags

LINQ VB.NET

Topics

Language Integrated Query - LINQ

,

Microsoft Visual Basic.Net

Participating Experts
1
Points
500
Comments
3

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Answers

 

by: FernandoSotoPosted on 2009-10-13 at 06:40:26ID: 25559736

Hi si2030;

Visual Basic does not support Lamda expressions so you need to use in-line functions. see updated code below.

Fernando

Dim statementInvoices = (From ledger In db.ledgers _
                         Where ledger.tran_date <= monthENDDate And ledger.tran_date >= monthSTARTDate And _
                         ledger.acc_id = "2" And ledger.reconciled <> "Y" And ledger.client_no = clientNo _
                         Select _
                         ledger.client_no, _
                         ledger.acc_id, _
                         ledger.ref1, _
                         ledger.tran_type, _
                         ledger.tran_date, _
                         ledger.detail, _
                         ledger.posting_id, _
                         ledger.link_posting_id, _
                         ledger.amount).Distinct.OrderBy(Function(l) l.tran_date) 

                                              
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by: si2030Posted on 2009-10-13 at 14:29:43ID: 31640488

Fernando... Brilliant! :)

 

by: FernandoSotoPosted on 2009-10-14 at 06:15:26ID: 25570059

Not a problem, glad I was able to help.  ;=)

20120131-EE-VQP-002

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