How To Find Item In Collection

May 17, 2011

I have created collection and adding values in the collection, later I need to find if uer passed value is exist in the collection or not, I use contains finction to find the answer but it always returns false even though user passed value exist in the collection list. here is my code:

[Code]...

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Every Nth Item In A Collection In .Net?

Dec 16, 2009

Nearly identical to How can I get every nth item from a List<T>?But I'm having trouble turning

List<T> list = originalList.Where((t,i) => (i % 5) == 0).ToList();

Into VB.Net code.

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Item Cannot Be Found In The Collection Corresponding?

Aug 17, 2009

This is my code.Private Sub cmdDelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdDelete.Click

[Code]...

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Know If Iterating On The Last Item Of The Collection?

Dec 26, 2010

I want to do something different on the last KeyValuePair of the Dictionary I'm iterating on.

For Each item In collection
If ItsTheLastItem
DoX()

[code].....

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LINQ To XML, Only Can Get First Item In Collection?

Sep 8, 2010

Here is an example of my xml doc:

<?xml version="1.0" encoding="utf-8"?>
<employeedata>
<employee>
<firstname>Bob</firstname>
<lastname>Anderson</lastname>

[Code]...

However, only the first phone number (Office) displays in the listbox. The phoneinfo collection has both <phone> elements, but the For Each statement doesn't seem to iterate thru.

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Removing An Item From A Collection?

Oct 14, 2009

Is there a way to remove 'this' item from a collection, i.e the one I'm working with, or do I always need an index?

For each ThisItem in MyCollection
if a=true then MyCollection.Remove(ThisItem)
next

[code].....

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Track Item Within A Collection On WP7?

Jan 30, 2011

I'm building a WP7 (VB.NET) app and have a custom class, PinInfo, of which I have two ObservableCollections, TempPins and FavoritePins.

In various parts of the app, I need a unique identifier to get a reference to a particular PinInfo in the collection, so at present, I assign an ID to the PinInfo when it's added to the collection, then later get a reference to the pin via the ID.

For example, if I create a button to delete a pin, I set its tag to the pin's ID, then the button click handler reads the button's tag to get the corresponding pin from the collection (via LINQ).

I generate the ID by adding one to the last-assigned ID, but these lists are often modified (i.e. items removed), so I end up with needlessly large ID numbers (e.g. just a few items, with IDs in the thousands).

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.net - Linking Ranges To Item In Collection?

Aug 17, 2011

I have a collection as such

Private Shared ReadOnly thermoPaths As New ReadOnlyCollection(Of String) _
({
"thermometer_000_108x320.jpg",
"thermometer_010_108x320.jpg",
"thermometer_020_108x320.jpg",
"thermometer_030_108x320.jpg",

[Code]...

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Collection Item Changed Index?

May 15, 2009

Is there any way to get the index of the changed item? I couldn't find any examples.

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Search For An Item In Collection Type?

Nov 10, 2011

I am using VB .NET 1.1 and wanted to make sure if inside a key value pair class "Dates" (collection type) a key by name "TerminationDate" exists.

If Not Dates.Item("TerminationDate") Is Nothing Then
'Do x y z'
End if

But this is throwing an exception: Argument Index is not a valid value.

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Find Dupes In Collection?

Sep 16, 2009

I have a collection of string items(approx 2000) and I need to find and list all the dupes in the list.How would I go about this?

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Get Index Of Item In Collection That Raised Event?

Jun 30, 2010

In a list of timers, how do I determine the index of the item that elapsed without having to iterate the collection as shown below (e.g. can I pass a paramater to OnTimedEvent, or can the collection raise an event to say which item fired???). It's the individual timer index that I need as I'm using it to refer to something else.

(I wont know how many items I'll have in the list in advance so I can't create an individual event handler for each timer - I don't think I should even if I did).

Public Class Form1
Private _timers As New List(Of System.Timers.Timer)
Private Sub Form3_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

[code]....

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LINQ - Select A *TYPED* Item In A Collection?

Mar 1, 2011

Can I use LINQ to return an item in a collection that is the same TYPE as the items in the collection? I am a LINQ Noob trying to avoid looping.

Dim mostRecentlyCreatedQuestionnaire As ParentQuestionnaireItem =
CType((From P In questionnaireCollection Order By P.Metadata.CreateDate Descending).Take(1), ParentQuestionnaireItem)

I get an "unable to CAST" error when I include the CTYPE function. I kind of expected that error, but I imagine that if I coul dnot do this, LINQ's usefulness would be diminished and therefore assume that there must be a way..

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Add Item To System.Collections.Specialized.String Collection When It Is Not Already There?

Dec 29, 2010

How can I have it so that you can add items to a System.Collections.Specialized.String Collection but only if it is not there already? I have already found the code, but deleted it and cannot remember it. It is something like[code]....

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Delete An Item From A Collection That Is Data Bound To A GridView?

Jul 22, 2011

I am creating a simple website using the language of VB.NET, I am having trouble with one part at the moment and could really use some help.

At the moment I have items that are stored in a database, when the homepage loads these items are added to a Gridview which allows the user to select the items they wish to add to their shopping cart. Once an item is selected from the gridview it is added to a collection. That collection is then added to a Session. This is the code I have for completing that task.[code]...

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Item Collection Of The ListBox1 Is Stored In A Text File?

Feb 15, 2010

I want to create a very simple database. form1 - ListBox1, textBox1, buttonadd, buttonremove. The item collection of the ListBox1 is stored in a txt file along with a string that will be displayed in the textbox1. the file will look like this ( like a .ini file):

[Code]...

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Linq - Select Single Item From Child Collection?

Jan 12, 2012

I have a parent child collection objects and was wondering how to get a single item from the child collection using Linq

[Code]...

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VS 2008 Return Listview Item Collection In Multithread?

Aug 31, 2009

I am doing this within a thread:For Each item As ListViewItem In lvUsers.Items and I am getting: Cross-thread operation not valid: Control 'lvUsers' accessed from a thread other than the thread it was created on.I have been able to adjust a control in a way using something like:

Public Delegate Sub ListAddNameInvoker(ByVal text As String)
Public Sub ListAddName(ByVal text As String)
If lvUsers.InvokeRequired Then

[code]....

But how do I get data from a control and pass it to another thread?

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C# - Find And Insert Into List Class Collection?

Mar 10, 2011

I have class called GroupSelect and made a collection List(Of GroupSelect)().[code]...

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VS 2005 : Make A Comboxbox List The First Item In The Collection By Default?

Nov 25, 2009

How can I make a comboxbox list the first item in the collection by default in other words i have a collection list

1
2
3
4
5

When program loads I want combobox to load 1

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VS 2008 Data Send To One Item In A Collection Is Changed For All Items

Jul 30, 2009

I have a class that contains a collection of another class. See below

Public Class Spot
Private mActive As Boolean
Public Sub New()

[Code]....

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C# - Speeding Up An Algorithm That Find Patterns In A Growing Collection - Code Review Beta - Stack Exchange?

Jun 25, 2012

I want to find a way to speed up this code.if you look at the condition of If calculated Then in the code below, this is what slowing down the code.While the code provided seem fast with Const initBit = 4 try it with something over 12.

I want to be able to use this code (with calculated param as True) with initBit of 20 or more.

Beware that 20 or more might require a gig or more of ram and/or compiled as x64.

C# code (converted with an online tool from VB.NET):

[Code]...

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Find The Certain Item?

Feb 16, 2010

For example, there are a lot of item in ListBox..so, how can i find the certain item that i need.. Let the item in ListBox as below

1234567899
9987654321
6666666666
8908899889
8678678768
5467676767

so, how can i find 6666666666 without using the scroll bar at ListBox

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Find Item In The Combobox?

Jun 22, 2010

how will I find an item that's in the combobox that everytime I pressed the keyboard it will be automatically displayed in the combobox?for example I have Items like cats,pigs,dogs in the textbox then when I press d or do the Items dogs will be displayed.

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Find Name By Knowing From Top Item Is Number 3

Jan 6, 2011

If I have four items in the listbox, e.g. a, b, c, d, how can I find the name by knowing from the top the item is number 3 (c)?

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Find An Item In An List(Of T) By Values X,y,z?

Jul 26, 2010

I have the following setup[code]...

What I would like is a Item property in the collection that I can say [code]...

I know about predicates but what I am struggling with is how to set the criteria of the predicate (i.e passing x,y,z)

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Find Item In ComboBox In Vb 2010

Apr 14, 2012

how to find item in ComboBox using visual basic 2010 ComboBox binding with Students Table i want to check in ComboBox item (studentName) found or not

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Find Item In List Of Class?

Mar 9, 2011

I have class called GroupSelect and made a collection List(Of GroupSelect)().Now I need find to RowNo = 4 in List(Of GroupSelect)() and get GroupSelect object.[code]

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Find The Count Of The 3 Item In Each String?

Jul 7, 2011

I have a List (Of String()). I wish to find the count of the 3 item in each string array in the list. Is there an easy way to find it using linq?

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How To Find Index Of Item In A Stack

May 26, 2009

I am using the stack class to store a collection of lines. <code>Dim myStack As New Stack(Of Line)</code> I want to find out what the index is of one of the lines that are in the collection and I'm not sure how to do this. i tried to use array.indexOf:

[Code]...

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