.net - Parallel.ForEach Local Storage?

Aug 3, 2010

I 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?

View 1 Replies


ADVERTISEMENT

How To Use Parallel.ForEach

Apr 15, 2010

tell how to form this to the correct Syntax?ere the sample in sequential form:ForEach ctrl AsCheckBoxIn tblCKBoxCollection.Controlsctrl.Checked =

View 1 Replies

VS 2010 First Attempt At Parallel.ForEach

Apr 16, 2010

I'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 Replies

NET 4.0 Parallel.ForEach AddressOf Multiple Values?

Nov 5, 2011

I 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]...

View 2 Replies

DB/Reporting :: Use DataSet For Local Data Storage?

Mar 22, 2009

I need a simple method for a user to enter as many rows of data as they wish (probably won't exceed 50 in most cases and that's pushing it) and then store that data for retrieving the next time they want to reuse that list. I will also need to read the rows in for manipulating text in a file with those entries.

Would the best method to be to use the DataSet in VB Express 2008 and then use the DataGridView for allowing the display and entry of the data?

View 1 Replies

Resizing Image Before Uploading To Local Storage

Jan 6, 2012

I want to resize the resolution of an image before uploading it to local storage. Right now it saves the image in its full resolution and I have to manually resize it using width="200" height="200" or a css tag in aspx. I want to reduce the file size of an image before storing it, hence by resizing the image resolution when the user uploads it via button. I've tried using System.Drawing before and setting the int imageHeight and int maxWidth to be resized but couldn't seem to get it to work.

My code so far is:
Protected Sub btn_SavePic_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btn_SavePic.Click
Dim newFileName As String
Dim SqlString As String
[Code] .....

View 1 Replies

Convert For Each GridViewRow To Parallel.ForEach GridViewRow?

Feb 17, 2011

I 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

View 7 Replies

Local Storage System For Relative Large Information

Nov 10, 2011

I've been reading a lot of articles here and there, really, for the past two days, searching for a good local storage system. I have no immediate use for now, so I am just exploring my choices. By saying 'local storage system,' I'm talking about some sort of database used for applications that let users manage and organize personal accounts (bank accounts, web site accounts, application licenses...). I do use XML to store user settings. But if you have to manage lots of information locally, XML won't probably be good enough, I'm afraid.

So what are choices Visua Basic users? Well, as I often mention, I develop Mac software products. And I use SQLite. In fact, every one of some 40 apps sold at Mac App Store uses SQLite for good reasons. I know that you can use SQLite with Visual Studio after installing a package from sqlite.phxsoftware.com. But I don't know if your application can reproduce a database file when necessary. That being said, I'm looking for a system that I can use to create a file programmatically especially when the user launches it for the first time. So what do you use to locally manage large information? SQL Express? SQLite? XML?

View 10 Replies

Parallel.For Termination - Service That Scans Network Folders Using A Parallel.for Method

Jan 16, 2012

I 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 Replies

Add Domain User To Local Group While Logged In As Local Account?

Sep 15, 2010

Does anyone know how this can be done? The problem is that when you run the script to add a domain user to the local group as a local user you have no permissions to query the domain. Is there a way to pass a user name and password when doing this? [code]...

View 3 Replies

Foreach In Faster Than In C#?

Mar 12, 2009

My 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?

View 5 Replies

.net - Action(Of T) In VB In List(Of T).ForEach?

May 21, 2009

I 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.

View 5 Replies

Anonymous Methods In .NET - Foreach?

May 16, 2011

I 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)?

View 2 Replies

Foreach - Each Loop On A 2D Array In .NET

Oct 14, 2011

I'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.

View 2 Replies

Iterating A List With ForEach

Mar 1, 2010

I have a list like this

[Code]...

How can I iterate the list with ForEach to get one string with the emails like this [URL]

View 5 Replies

VS 2008 - Using 2d Array With Foreach

Aug 24, 2010

is it possible to use foreach with a 2d array?

View 8 Replies

VS 2008 Getting Certain Info In Foreach

Aug 30, 2009

What 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, 2012

I'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]...

View 2 Replies

Changing The Value Of An Array Through A Foreach Statement?

Jun 13, 2012

I 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

View 2 Replies

Convert Collection.foreach From C# To Program?

May 12, 2009

In 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 Replies

DataGrid View Creation Via ForEach

Apr 18, 2012

I 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 Replies

Dynamically Add Checkboxes In A Foreach Loop?

May 8, 2009

I 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...

View 7 Replies

VS 2008 - Second Foreach Loop Runs

Jul 9, 2009

I 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.

View 11 Replies

VS 2010 Use Paralell.ForEach With A SearchResultCollection?

Oct 18, 2010

I 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?

View 13 Replies

[2008] Foreach Variable Undeclared?

Mar 9, 2009

i'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].....

View 4 Replies

Access Label Of Form In ForEach Loop?

Apr 8, 2009

I 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 Replies

C# - Why Only Static / Shared Version Of ForEach For Arrays

Aug 18, 2011

Why 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?

View 2 Replies

C# - Write XML File Foreach Datarows In Dataset?

Jul 29, 2011

How 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 Replies

Starting Same Thread From A Foreach Loop Not Working?

Dec 17, 2010

Is 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.

View 3 Replies

Update Property Of Object In List In ForEach?

Apr 2, 2011

I 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?)

View 1 Replies







Copyrights 2005-15 www.BigResource.com, All rights reserved