How To Use Parallel.ForEach
Apr 15, 2010tell how to form this to the correct Syntax?ere the sample in sequential form:ForEach ctrl AsCheckBoxIn tblCKBoxCollection.Controlsctrl.Checked =
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.net - Parallel.ForEach Local Storage?
Aug 3, 2010I recently changed a For Each loop to a Parallel.ForEach loop. I'm concerned about an object being declared outside the loop but assigned while iterating in the loop. Here is the simplified code.
Dim results As ModelResults
Dim noResultsModel As New List(Of ModelResults)
Dim lock As New Object
Parallel.ForEach(_modelEngines,
Sub(model)
[Code]...
Is there a potential race condition with the results object? Would anything be different if I moved the declaration of results into the for loop?
VS 2010 First Attempt At Parallel.ForEach
Apr 16, 2010I've been trying to follow the examples I've found online and, well, I can't really get my head around what I've done wrong.So, I have a simple piece of code to search for a machine in AD, as so. [code]
View 5 RepliesNET 4.0 Parallel.ForEach AddressOf Multiple Values?
Nov 5, 2011I am trying change from Delegates to Parallel.ForEach I see the below works fine. Imports System.Threading.Tasks
Sub Main()
Dim secs() As Integer = {2, 3, 1}
Parallel.ForEach(secs, AddressOf Method2)
End Sub
[Code]...
Convert For Each GridViewRow To Parallel.ForEach GridViewRow?
Feb 17, 2011I am trying to convert the code below into a parallel loop. What is the proper syntax to use Parallel.ForEach instead of just ForEach?
For Each grow As GridViewRow In gvEmployees.Rows
SendSummaryReport(grow)
Next
Parallel.For Termination - Service That Scans Network Folders Using A Parallel.for Method
Jan 16, 2012I have a service that scans network folders using a parallel.for method. However recently I am finding if I stop the service then while windows says the service is stopped the process is still running in task manager. However it is at 0 cpu and the memory does not change. If I try and end the task (even a force in command prompt) it just says access denied and i have to reboot the server. What would be the best way to make sure everything terminates? I thought of adding a global Boolean that in the stop procedure it turns true and part of my parallel code will check for that and call s.stop.
View 1 RepliesForeach In Faster Than In C#?
Mar 12, 2009My co-worker said that in a previous interview, he learned that foreach is faster in VB.Net than c#'s foreach. He was told that this was because both have different CLR implementation.
Coming from a C++ perspective, I'm curious on why this is and I was told that I need to read up on CLR first. Googling foreach and CLR doesn't help me understand.
Does anyone have a good explanation on why foreach is faster in VB.Net than in c#? Or was my co-worker misinformed?
.net - Action(Of T) In VB In List(Of T).ForEach?
May 21, 2009I have searched high and low for documentation on how to use this feature. While the loop I could write would be simple and take no time, I really would like to learn how to use this. Basically I have a class, say, Widget, with a Save() sub that returns nothing. So:
Dim w as New Widget()
w.Save()
basically saves the widget. Now let's say I have a generic collection List(Of Widget) name widgetList(Of Widget) and I want to run a Save() on each item in that list. It says I can do a
widgetList.ForEach([enter Action(Of T) here])
....but how in the F does this work??? There is no documentation anywhere on the intrablags.
Anonymous Methods In .NET - Foreach?
May 16, 2011I try to replace the classic For Each with the LINQ ForEach method in VB.NET
Dim singles As New List(Of Single)(someSingleList)
Dim integers As New List(Of Integer)
For Each singleValue In singles
[code]....
How should I correctly do it (using anonymous methods = without declare a new function)?
Foreach - Each Loop On A 2D Array In .NET
Oct 14, 2011I'm writing a loop to go through the first array of a 2D loop, and I currently have it like this:
For Each Dir_path In MasterIndex(, 0)
'do some stuff here
Next
But it's giving me an error, saying it expects an expression in the first field. But that's what I'm trying to do, loop through the first field. How do I fix this? What would I put in there?
EDIT: to clarify, I'm specifically looking for the 0th element in the subarray of each array, that's why that second field is constantly 0.
Iterating A List With ForEach
Mar 1, 2010I have a list like this
[Code]...
How can I iterate the list with ForEach to get one string with the emails like this [URL]
VS 2008 - Using 2d Array With Foreach
Aug 24, 2010is it possible to use foreach with a 2d array?
View 8 RepliesVS 2008 Getting Certain Info In Foreach
Aug 30, 2009What i'm doing is getting values from some html, i use a regex to retrieve all the fields, but there are some fields brought back i don't need (4 out of 11) i know the names of these fields, but was wondering if there was a way i could filter out the ones i don't need in the foreach:[code]
View 5 Replies.net - Unexpected IQueryable Value After ForEach Iteration?
Apr 15, 2012I'm flummoxed I'm using VB.Net, Linq, and a DataContext. My DataContext contains a table 'transactions'.
I first declare an IQueryable(Of transaction) and assign it to nothing. I build a predicate in a foreach loop and use a transactions.Where(predicate) to assign the IQueryable a value. If I do an IQueryable.ToList(), I get a number of items in the collection.
However, on the next iteration of the loop, the IQueryable.ToList() gives me 0 items.This is driving me crazy. I tried to use the LINQ to SQL Debug Visualizer with VS2010, (I recompiled the 2008 version with the new reference) but no dice - I can't see the SQl generated or what's inside the IQueryable.
[Code]...
Changing The Value Of An Array Through A Foreach Statement?
Jun 13, 2012I am making a program that automates the seperation of a csv file. We read the csv in through and then assign the "line" using a split command to an array. After that we go through each "cell" in the array and put an = in front because this causes leading zeros not to be lost. Here's the code.
arLine = line.Split(replace)
For Each cell As String In arLine
cell = cell.Replace(",", "")
cell = String.Format(cellFormat, cell)
Next
arLine is the array and replace is the delimiter, in this case a pipe not that it matters.'
When it goes through, the arLine is correct but the values in each cell are not changing, any thoughts? newer to VB.net and need direction
Convert Collection.foreach From C# To Program?
May 12, 2009In C# i just put the method in the parentheses that i want to run on each row of the collection, but it isn't working in VB.NET.[code]...
View 1 RepliesDataGrid View Creation Via ForEach
Apr 18, 2012I am having an issue extracting the value from every row in column "MobileID" within a table named "dt" that is within a dataset named "ds".Here is how the dataset and datatable are created.[code]
View 1 RepliesDynamically Add Checkboxes In A Foreach Loop?
May 8, 2009I have the following for each loop which loops through a registry key and reads all the values:
Dim returnValue As RegistryKey = Registry.LocalMachine.OpenSubKey("SOFTWAREMicrosoftWindowsCurrentVersionRun")
Dim keyname As String = "HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun"
Dim values() As String = returnValue.GetValueNames
[code].....
What I am trying to have been highlighted in bold.. Each time the loop executes and reads a value from the registry, I want the code to create a checkbox which has a unique name and text according to the value that was read... So the number of checkboxes will depend on number of values that is got from the registry...But this doesn't work. It only creates one text box and the text of the textbox is also incomplete...
VS 2008 - Second Foreach Loop Runs
Jul 9, 2009I have the following Method:
CODE:
Everything is working fine except for one part. The part where the second foreach loop runs. If I only have one plugin installed it puts 2 entries in the list. The reason is because it has 2 rows and it is adding it twice. I know what the issue is I just am drawing a blank right now.
VS 2010 Use Paralell.ForEach With A SearchResultCollection?
Oct 18, 2010I can't seem to get the syntax right for a simple Parallel.Foreach Loop.
This is how I would normally iterate a SearchResultCollection
Dim src As SearchResultCollection = DSearch.FindAll
For Each x As SearchResult In src
Debug.WriteLine(GetProperty(x, "Name"))
'Parallel.ForEach(x, Function(x) Debug.WriteLine(x))
Next
As I have (obviously) misunderstood it this should be the syntax for the Parallel.Foreach
Parallel.ForEach(src, (Sub(x As SearchResult) GetProperty(x, "Name")))
Parallel.ForEach(src, Function(x) Debug.WriteLine(x))
It's not that though. What's the correct syntax here?
[2008] Foreach Variable Undeclared?
Mar 9, 2009i'm using a foreach to loop through my regular expression like:
For Each secwordMatch As Match In secwordmatches
Dim secWord As String = secwordMatch.ToString
Next
[code].....
Access Label Of Form In ForEach Loop?
Apr 8, 2009I have a form called frmMapViewer. In this form I 25 labels showing districts of my country. think I want to assign names(text property) to each label.[code]...
View 5 RepliesC# - Why Only Static / Shared Version Of ForEach For Arrays
Aug 18, 2011Why there is only a static/shared version of ForEach for arrays?
IE: ForEach<T>(T array[], System.Action(Of T) action[])
I assume this has something to do with the type inference requirements of implementing an instance method, but when you declare your array you provide type right?
C# - Write XML File Foreach Datarows In Dataset?
Jul 29, 2011How to write xml foreach datarow in dataset? I have dataset with 5 record in table, i want write to xml file with 5 xml file. in one xml file have one record.
View 2 RepliesStarting Same Thread From A Foreach Loop Not Working?
Dec 17, 2010Is there a way to start same Thread form foreach loop
Sub
For Each lvItem As ListViewItem In _ListView.SelectedItems
tThread = New Thread(AddressOf Me.myFunction())
[Code]....
In my case, when i select one item from list it is working fine...but when i select more than one files it odes not work.
Update Property Of Object In List In ForEach?
Apr 2, 2011I have a List(Of SomeObject) that I enumerate over using a For Each loop. This SomeObject contains a Property that references another Object, as such
Class SomeObject
Public Property Another As AnotherObject
Get
[Code]....
If not, what is a valid way to do it? (ordinary for loop perhaps?)
Foreach - .NET For Each Steps Into Loop Body For An IEnumerable Collection?
Mar 11, 2010This is weird. I have a class that inherits from IEnumrable whose Count property is reporting 0 (zero) elements but the For Each loop steps into the loop body and tries to use the variable where it should just be moving on. My code:
On Error Resume Next
Dim d As Foo
For Each d In fooCollection
' use d and throws an exception
Next d
Weirder still, every time d is accessed i get an exception thrown in the output window:
A first chance exception of type 'System.NullReferenceException'
but i'm not stopping on the exception (not in a try/catch block).Is "On Error Resume Next" causing this weirdness?
Weirdness found:Per Rowland's and JohnH's comments i checked the Foo class:The GetEnumerator method inside of Foo didn't actually return anything! It had an empty body. That coupled with the On Error Resume Next before the loop caused the havoc! Wow this was ugly.
Paralell.ForEach Add Items To Source While The Task Is Running?
Jun 5, 2012I am using Parallel.ForEach to do some time consuming operation. Coming to the question ,
For example,
I am enumerating a collection called 'TestCollection' which has 3 items.
Parallel.ForEach(TestCollection, po, AddressOf DoSomeThing) So 3 tasks will be running in paralell at a time Now I want to add another 2 items to TestCollection, while the task is running.
How to enque the additional 2 items to the 'TestCollection' so that additional two tasks will also run in paralell. Finally 5 tasks should run in paralell without stopping the running task. If a post answers your question,
VS 2008 - Foreach Values - Blank Out The First 4 Fields Returned ?
Jan 1, 2010When i parse some html and get the fields i need using regex, the first 4 fields returned are fields i don't need, so essentially i need all fields returned after the 4th one.
vb.net '// First piece of data we want...
Dim stringID As New Regex("(?<=><optionvalue="").*?(?="">)", _
RegexOptions.IgnoreCase Or RegexOptions.Singleline)
Dim stringsMatched As MatchCollection = stringID.Matches(stringClean)
[CODE]...
Is there a way i can blank out the first 4 fields returned?
.net - Generic List Extension Method ForEach Stopped Working?
Dec 16, 2010I have a custom list that inherits Generic.List and it has a method for deselecting all of the members named DeselectAll It has looked like this for a few weeks and has worked fine.
Public Sub DeselectAll()
MyBase.ForEach(Function(p As Publipostable) p.ModeEnvoiChoisi = Nothing)
End Sub
Today, it stopped working ?!? I reverted to an earlier version using delegates and that works fine...
Public Sub DeselectAll()
MyBase.ForEach(AddressOf DeselectModeEnvoi)
End Sub
[code]....
Edit: Stopped Working meaning it no longer sets the property p.ModeEnvoiChoisi to Nothing on each item in the list. The DeselectAll method gets called, but all the items retain their previous values...