Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

For each loop to execute LINQ query failed without going through the loop?

Posted on 2008-06-22
1
Medium Priority
?
503 Views
Last Modified: 2013-11-26
Build ok and no error message but when debug reached the 'for each... next' it skip over the loop...
I have Imported the following:
Imports System.Data
Imports System.Data.DataSet
Imports System.Data.OleDb
Imports Microsoft.Office.Interop.Access
Imports Microsoft.Office.Interop.Word
Imports System
Imports System.Collections
Imports System.Collections.Specialized
Imports System.Linq
Imports System.Linq.Expressions
Imports System.Data.Common
Imports System.Collections.Generic
Imports System.Text
Imports System.Data.SqlClient
 and used a typed dataset datatable as data source in the attached code snippet.
Can you tell what's wrong or missing?
Thank you.
Dim tiu As DataTable = ds.Tables(tblname)
        Dim dy As New dDataSet()
        Dim Th As DataTable = dy.Tables("th")
        Console.WriteLine("{0}", Me.ID.ToString)
        Console.WriteLine("{0}", ds.Tables(tblname).TableName.ToString)
 
        Dim thquery = From f In Th Where f.Field(Of String)("voc") = tiu.Rows(0).ToString Select New With {.v = f.Field(Of String)("voc"), .g = f.Field(Of String)("gP"), .s = f.Field(Of String)("subHead"), .ke = f.Field(Of String)("key")}
 For Each f In thquery
            Console.WriteLine("{0}", f.v)
            myrowTh = _vDtTh.NewRow()
            myrowTh(mycol) = f.v
            myrowTh(mycolgP) = f.g
            myrowTh(mycolsubHead) = f.s
            myrowTh(mycolkey) = f.ke
            _vDt.Rows.Add(myrowTh)
        Next

Open in new window

0
Comment
Question by:isischen
[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
1 Comment
 
LVL 16

Accepted Solution

by:
CuteBug earned 2000 total points
ID: 21844393
This is because, the LINQ query returns no results due to which "thquery" is null.

Now since it is null, it will not enter the For Each loop.

Maybe the problem lies in your LINQ query. It might not be proper.
0

Featured Post

[Webinar] Lessons on Recovering from Petya

Skyport is working hard to help customers recover from recent attacks, like the Petya worm. This work has brought to light some important lessons. New malware attacks like this can take down your entire environment. Learn from others mistakes on how to prevent Petya like worms.

Question has a verified solution.

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

It’s quite interesting for me as I worked with Excel using vb.net for some time. Here are some topics which I know want to share with others whom this might help. First of all if you are working with Excel then you need to Download the Following …
Real-time is more about the business, not the technology. In day-to-day life, to make real-time decisions like buying or investing, business needs the latest information(e.g. Gold Rate/Stock Rate). Unlike traditional days, you need not wait for a fe…
This course is ideal for IT System Administrators working with VMware vSphere and its associated products in their company infrastructure. This course teaches you how to install and maintain this virtualization technology to store data, prevent vuln…
Video by: ITPro.TV
In this episode Don builds upon the troubleshooting techniques by demonstrating how to properly monitor a vSphere deployment to detect problems before they occur. He begins the show using tools found within the vSphere suite as ends the show demonst…

610 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