Loop Through A Collection Of Controls?
Feb 24, 2010Im trying to loop through a collection of controls see code:
Private Sub addZeros()
For Each ctrl As Control In Me.Controls
If TypeOf ctrl Is GroupBox Then
[Code]....
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VS 2005 - Controlcollection - Make A Collection Of Controls That I Can Loop Through
Mar 2, 2010I am trying to make a collection of controls that I can loop through. So I have this code in my form... Dim WizardFrameCollection As New Control.ControlCollection(Nothing)
I then try to add controls to the collection by I get a error "Object reference not set to an instance of an object." WizardFrameCollection.Add(Me.GroupBox1) I am not sure why I am getting this error. Groupbox1 is a groupbox that is on the form.
Asp.net - Add Controls To A Collection And Update From Collection
Mar 25, 2011I have an ASP.NET app with lots of textboxes all over the page that need updating at various points through program execution. These textboxes actually belong to a certain class, so for easy updating I thought I could create a Dictionary(Of string, object) and add the control.ID and the control to it and then for updating do something like this:
[Code]...
Setting A 'default' Value To Controls (textbox) (loop Controls)?
Nov 11, 2009I have aspx form with several textboxes.They are populated with values from a table via retrieval of a dataview.If the row count for the dataview is 0, then I'd like to reset the values in all textboxes. How can I loop through all the textboxes and set a default value?I've tried the following, but no sucess.
For Each ctrl As Control In Page.Form.Controls
If TypeOf ctrl Is WebControls.TextBox Then
CType(ctrl, WebControls.TextBox).Text = ""
End If
Next
My first For Loop was using Page.Controls but it returned only 1 count.The textboxes are inside a tabpanel (ajax), so do I have to locate the tabpage and then find all it's controls (for each tabpage)?
VS 2008 Loop Through Controls Doesn't Get All Controls?
Jan 21, 2011I am rather irritated at this. I have no clue why looping through controls on a form and in groupboxes leaves out 75% of the controls.
Here's the code I have:
Dim settings As String = ""
Dim gbControl As Control
Dim gbbox As Control
[Code]....
I want to have setting save all settings to an ini file, and not have to reprogram the saving routine when I add a group box or control. At random times, any number of controls can be disabled, checkboxes can be checked and unchecked, radiobuttons can be checked and unchecked. Regardless of the state of the control, I want the control to show up in the loop. But they don't. Only controls that are enabled and only checkboxes that are checked, every other control state is ignored. That's crap, and is definitely not what is needed by any programmer of any type. We're capable of determining if a control is enabled, hidden, checked, visible, and otherwise.
How do I get the controls to be included in the loop regardless of their state?
.net - Changing A Collection From Within A Loop?
Apr 13, 2010I have a simple Dictionary(of String, Object) that I need to iterate through and change items depending on some conditions.As I can't modify a collection that I'm iterating through, how do I achieve this?For example, the following obviously causes an Invalid Operation Exception:
Dim mOptions As New Dictionary(of String, Object)
mOptions.Add("optA", "A")
mOptions.Add("optB", "B")
mOptions.Add("optC", "C")
[code]....
Loop Through Object Collection
Jan 5, 2011In an application I am working on I have created a product class which represents an inventory item. I have also created an inventory class which represents a collection of product objects. In the constructor of the Inventory class I load 4 products into a product collection. Each product consists of a code, description price and quantity.
[Code]...
Wpf - Loop Through A Xml And Add Data To Collection
Feb 9, 2012I'm trying to just iterate through this xml and grab all of its data and add it to my collection(_personOC). Right now it's not working. How can I do this without having to specify the id? All I did was make a dataset with a person table and saved it as a xml.
Public Property personOC As ObservableCollection(Of Person)
Get
Return _personOC
[Code]....
Getting An Error With A For....Each Loop For A Collection Class?
Sep 1, 2010I decided to go back to the VB6 book, "Learn to Program Visual Basic Objects", so I can code it in VB2010. This has been a great learning experience. However I've run into a problem. I'm getting an error with a For....Each loop for a collection class. The error message states, Expression is of type 'China.Order', which is not a collection type." From what I've deduced the problem deals with an enumerator. I could be wrong.
View 2 RepliesHow To Loop Through DGV Selected Rows Collection
Apr 1, 2009how to loop through DGV selected rows collection?
View 2 RepliesLoop Through A Collection Object In VB 2010
Aug 30, 2010I'm trying to loop through a collection object in vb2010.The code was originally used in Vb6 The book said that I needed to code a NewEnumerator method first in order to be able to loop through my collection. I coded the following:
[code]...
It gives an error for IUnknown, staging that IUnknown is not accessible in this context because it is a 'Friend'.In the line in the function I removed the Set since it's no longer needed.The error message for this line is '_NewEnum' is not a member of 'Microsoft.VisualBasic.Collection'What are these messages and how do I fix this in VB 2010?m_colCourse is not a system collection.
VS 2005 Loop Through Collection Of Collections
Jul 23, 2009I have a Collection, the keys are strings and the values are Collections. In the sub Collections the keys are strings and values are Singles/Floats. How would I loop through all of the data? I need to get the keys and values not just the values. I've tried this but it produces a cast error:
[Code]...
VS 2008 Can't Loop Through Items In A Collection
Apr 15, 2010CAUTION: Noob using Win32 API ahead
I want to display a list of open windows on my computer in a rich text box. So, I'm trying to store the names of all windows in myString, and then set RichTextBox1.Text = myString.
Here's the code
Imports System
Imports System.Collections.Generic
Imports System.Collections.ObjectModel
[Code].....
Not All Controls In Collection Are Being Copied?
Dec 13, 2011I'm a bit confused here. I'm copying all the controls from one form to a panel on the main form and for some reason only about half of them copy.
Private Sub switchComponent()
Dim selection As String = TreeView1.SelectedNode.Text
Panel1.Controls.Clear()[code]....
When stepping through the code, serverDic(selection).Controls has 12 elements, but only 6 of them get copied. Next time this gets called, only 3 get copied. Does Panel1.Controls.clear() somehow kill the references?
EDIT: Just to show that there are infact 12 elements in the collection:
Working With The Controls Collection?
Feb 17, 2010I often see code snippets for handling each control of a certain type on a form or panel, etc.They always start with For Each ctrl and the do a test for control type.Many .NET users are not aware, as I was not until I tried it recently, that we can LINQ on the controls collection.Below is a simple sub I created for resetting every checkbox on a panel I use as a validator.
Private Sub ResetCheckBoxes(ByRef pnl As Panel)
Dim ctrls as System.Collections.Generic.IEnumerable(Of Object)
ctrls = From c In pnl.Controls Where TypeOf (c) Is CheckBox
[code]....
Infinite Loop When Json Serializing A Collection
Sep 1, 2010I am trying to use a Web Service to return Json for a Collection of Users from a Database Table. I'm only new to .NET (< 1 week experience), and I don't want to use the UpdatePanel for AJAX. I have tried using the JavaScriptSerializer as well as Json.NET to serialize. Both cases seem to spawn an Infinite Loop.[code]
View 1 RepliesListbox: Only Loop Through SELECTED Values Collection
Mar 17, 2009Is there a way to to combine line's 1 and 2? I only want to loop through a list of the selected items in this listbox. This works just fine, I just wondered if there was a collection of selected values returned that I could use to avoid having to do it this way.
For Loop1 = 0 To MyListBox.Items.Count - 1
If MyListBox.Items(Loop1).Selected = True Then
...
End
Next
VS 2005 Erasing Items In A Collection Using A Loop?
Jul 1, 2009I often use a for/next loop to cycle through a collection to find a particular member of that collection based on some criteria. This works fine in every case except one: when I want to then erase the very member of the collection I just found. For example, if I wanted to give the heave-ho to every obect in a collection class that has a member veriable Color equal to Red:
[Code]...
The problem is once the collection class member is erased it makes to loop invalid because taking out the member reduces the total count of the collection in the middle of the loop. Eventually I get a "Index is out of range" error.This circumstance has bothered me every so often; I bet more experienced programmers have a different type of loop system that works better than this when you want to erase a collection member.
Access FontDialog's Controls Collection?
Aug 27, 2010Does anyone know how I can access the FontDialog's controls collection? I would like to disable the Font Style ListBox, set the Font Style's TextBox to readonly and disable the UnderLine and StrikeOut CheckBoxes.
View 3 RepliesAssign A Group Name To A Collection Of Controls?
Apr 15, 2011Maybe if I knew the right termanology, I could find the answer myself.. I am going to run a fairly long list of "If"s that will determine if certain controls appear on the form or not. In it's simplest form would be:
[Code]...
Get Last Instance Of Collection Controls Using Linq?
Mar 6, 2012How to get the last instance of label control in List (of Control) using linq?
View 4 RepliesReference ContextMenuStrip From Controls Collection?
Jan 6, 2010I am writing a simple control translation function that reads an XML file containing control names and their localized text. Within the application, each time a form is loaded, it iterates through every control and tests to see if that control is defined in the XML file. If it is, it then sets the control text to whatever localized text is defined in the XML file.
There are some tests and additional requirements (i.e. nested loops) for TabControl and MenuStrip etc., but the control that is giving me the most trouble is the ContextMenuStrip.[code]...
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.
Saving Items In A Collection To A Database Using A Loop Function?
May 12, 2011I would like to be able to save to a db and send task to email or as text msg for instance nevermind that.. I have two variables of type ArrayList they are "_mList1" , "_mList2" and "_mList3"
_mList1 stores the list of Telephonenumbers , _mList2 stores the list of StaffIDs and _mList3 Some concatenated string.
theses variable lists will hold some data in runtime as explained and i would like to use them to populate a DB table again mentioned
tblTask (TaskID(PK), Action, StaffID(FK), AssignedBy, TelephoneContacted, NotesCotent)
tblStaff (StaffID(PK), FirstName, Surname, Telephone, Address etc..)
[Code]....
Add Controls To A Collection Runtime(toolstripmenus To A Menustrip)?
Dec 29, 2009I am trying to add controls to a collection runtime(toolstripmenus to a menustrip) However, when I try to loop through the collection, it says something like: "Collection has been edited. Listing function cannot be done" (it's a free translation since i have a finnish VB)
View 2 RepliesAsp.net - Detecting If Controls Exist In A Control Collection?
Mar 12, 2009I am trying to dynamically add some css and js elements into an ASP.Net page at runtime, but because this code is used in mutliple controls I need to ensure that the relevant links are only injected once.
Currently I have the folowing code in the OnPreRender event.
Dim head As HtmlControls.HtmlHead = Me.Parent.Page.Header
If Not _useCustomStyles Then
Dim litCustomCss As New LiteralControl("<link rel=" & Chr(34) & "stylesheet" &
[Code]....
Does .Contains look for this instance of an object (which I assume is why this is failing)?
Is there a way to check the controls collection for a specific id? Or am I going to have to write a sub to loop through the existing controls in the collection checking for the id.
Determine The Type Of Control In The Controls Collection
Oct 9, 2009I have a small piece of code that iterates through the controls collection on a panel (below) Everything works fine until I want to focus on a control that doesn't support the selectall method i.e. a datetimepicker. Is there any way of determining the type of control and not call the selectall method when the type is datetimepicker. All my other controls support it so that's the only one I need to exclude.
[code]...
Javascript - Modifying Controls Collection Error
Mar 31, 2011I need a function to be performed on the page load, which uses a stored session variable. I have added the following to my <body> tag.
<body onload="doSomething(event,'<%= Session("StartTime") %>')>
This does work. However, it is causing a problem elsewhere, when I try to add a control to my controls collection:
[Code]....
VS 2008 - Access The FontDialog's Controls Collection
Aug 27, 2010Does anyone know how I can access the FontDialog's controls collection? I would like to disable the Font Style ListBox, set the Font Style's TextBox to readonly and disable the UnderLine and StrikeOut CheckBoxes.
View 3 RepliesFor Each Loop Error: Collection Was Modified; Enumeration Operation Might Not Execute
Oct 15, 2011I am encountering an error when looping through datarows. I searched SO and tried the solutions, but no luck. Collection was modified; enumeration operation might not execute.
Dim dRow As DataRow
For Each dRow In dt.Rows
dt.Rows.Add(dRow("CustNum"), dRow("SalesRepName"), dRow("mgrid"), "=""" & dRow("midValue") & """", dRow("dba"), dRow("sysDate"), dRow("statusID"))
Next
The error occurs the first time the code hits "Next". What would be causing Collection was modified; enumeration operation might not execute.How can I resolve this error?