VS 2005 AddHandler/RemoveHandler?
Feb 23, 2010the concept of AddHandler/RemoveHandler with a very simple example?
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Addhandler - Use RemoveHandler & Anonymous Methods?
Sep 16, 2011How do I use RemoveHandler with anonymous methods? This is how I add a handler for MyEvent event of the class MyClass
AddHandler MyClass.MyEvent, Sub()
...
End Sub
How do I then use RemoveHandler to remove the handler for the MyEvent event
Event Addhandler, RemoveHandler Repetition Conundrum?
Apr 14, 2010I'm getting a bit more fluent in VB.Net, but am still a bit green around the edges in certain aspects. I'm creating custom controls, and am starting to rely heavily on AddHandlers to manage them.Until recently, I didn't realize that you can add multiple event handlers for the same control and same address
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The above code would create 10,000 copies of the same event, and if I would click on combobutton1, the event would fire 10,000 times. I only need to fire the event once, but sometimes my code is a bit circular, and there may be an instance where two or more addhandlers are designated for a given control and address. Is there a way to have a loop on my custom dispose event where it would look something like:
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Or better yet, remove all events from a control(On a side note, is there any way in the debug mode to see all the active events attached to a control?)
VS 2005 Passing A Parameter With AddHandler?
Oct 2, 2009From what I understand, when you use AddHandler you're not actually calling a Sub, so you can't pass a parameter. I'm confused on what to do though about this. I've just populated a DataGridView and added a button to it in the codebehind. I'm then using an AddHandler to add a click event to the button. So when I get to the click event, I need to be able to access to the datagridview because clicking the button takes data from the datagridview and loads it into excel. What would I do about this. This is my Method where DataGridView was just populated
Dim btn As New Button
btn.Name = dgv.ToString()
btn.Location = New Point(0, 0)
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Do I Have To Use RemoveHandler?
Sep 15, 2011If I always need to call RemoveHandler after using AddHandler, where is the best place to do so? I have searched several similar questions as follows, but I do not quite understand.When and where to call the RemoveHandler in VB.NET? AddHandler/RemoveHandler Not Disposing Correctly..I thought garbage collection in c# or vb.net will take care of unused objects. Also, in vb.net designer, it automatically generates Dispose Sub. So I did not pay attention to programally releasing resource at all. Will I have any memory leak problems? Please kindly provide me some links/documents for me to start learning.[code]
View 1 RepliesCall RemoveHandler In Program?
Apr 27, 2010I am working to a VB.NET windows forms projet in .NET 1.1. And I have this type of architecture, very simplified.[code]...
Depending of the type of test I am doing I create an instance of a specific test derived from BaseTestLogic. But I found that after hundreds of object creations I can have StackOverflow exception.
I checked my code and saw that I forgot to remove the handler to Timer Tick. The question is, where and when is it correct to remove hadler?
Do I need to implement the IDisposable interface in the base class and RemoveHandler in Dispose?
RemoveHandler Syntax In VSTS 2008 RTM?
Feb 5, 2008The VB documentation shows the Syntax for RemoveHandler statement as:
RemoveHandler event, AddressOf eventhandler and shows a Sample usage as:
VS 2010 RemoveHandler With Lambda Expressions?
Jul 1, 2011To streamline code, I increasingly rely on lambda expressions. But I may have hit against the wall in the attempt of removing an event handler set by a lambda expression. This really eludes me. The code below shows two samples: Alt1 uses a plain lambda expression as delegate and works fine: the object size increases as the numeric control varies. However, the drawback is that the handler cannot be removed:
RemoveHandler Me.upDnScale.ValueChanged, Sub(sender As Object, e As Object) ScaleObject1(sender, e, objTgt)
According to this MSDN article, a variable should be used to set/remove lambda based handlers. Alt2 shows a couple of attempts, but none works.
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Warning On RemoveHandler For UserControl Event
Feb 27, 2010Using VB2008 Express I'm getting the following warning on a RemoveHandler statement and subsequent issues since the event is still hooked. Warning 1 The 'AddressOf' expression has no effect in this context because the method argument to 'AddressOf' requires a relaxed conversion to the delegate type of the event. Assign the 'AddressOf' expression to a variable, and use the variable to add or remove the method as the handler.
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Events And Why RemoveHandler Is Required For Memory Leaks
Feb 18, 2010I have attempted to understand the behind-the-scenes stuff for Events several times. I must have read at least a dozen articles but there is still some ambiguity in my head.
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.net - AddHandler Not Working?
Apr 26, 2010I can't figure out why my addhandler is not firing?In the Sub "CreateTagStyle" the AddHandler is not firing when the LinkButton is clicked Is there some reason that addhandlers can't be added at certain points of the page lifecycle?
<%@ Page Title="" Language="VB" MasterPageFile="~/_Common/Admin.master" %>
<script runat="server">
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
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Addhandler Is Not Correct
Dec 16, 2009My add handler is not correct for some reason. I don't know what I have incorrect. trying to add a row to the datatable upon formload. it says that NewM8_CustomersRow is not an event for BA_TruckingDataSet.M8_CustomersDatatable
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Addhandler With A Delegate?
Nov 23, 2009I came across a snippet of C# code which is very useful. I am trying to convert it to VB.NET, but can't seem to.
timer.Tick += delegate { panel.Children.Add(source); timer.Stop(); };
Is it possible to translate this to something similar in VB?
AddHandler With Parameters?
Nov 26, 2010problem with AddHandler with parameters.
i've create a control, here is the code:
Public Class myWorker
Public Event Complete()
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Need To EnterWriteLock When Using AddHandler?
Jul 25, 2009When using a ReadWriteLockSlim for multi-threading support, do I need to EnterWriteLock when using AddHandler? [code]
View 1 Replies.net - Addhandler Is Not Firing Off In Rowdatabound?
Jun 1, 2009I am creating a dropdown list in code for a gridview. I want to create an addhandler so I can have access to the selectedvalue. However, here (Rowdatabound) the add handler does not get fired off. How should I go about this?
Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound
''//------------does not fire off add handler-----
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.net - AddHandler Only If No Handlers For Event?
Jan 25, 2010I want to set an event handler only if this is not set:
If GetHandlers(MyWindow.Closed, AddressOf MyWindow_Closed).Length = 0 Then
AddHandler MyWindow.Closed, AddressOf MyWindow_Closed
EndIf
Addhandler Events Of An Object ?
Nov 25, 2009I have a number of UserControls that have the same event .
When I use an Object instead of UserControl, I can not use Addhandler.
Here is the simplest example of my problem: In this example error is "TextChanged is not an event of Object"
Dim obj As Object = TextBox1 AddHandler obj.TextChanged, AddressOf text_changed_event I have to use this structure, because in a FOR loop I use some different UserControls as obj. All UserControls have the same event.
Is there a way to use this structure without error?
Maybe there is a way to define a new object that covers all my UserControls.
Addhandler Events Of An Object?
Feb 10, 2011I have a number of UserControls that have the same event .When I use an Object instead of UserControl, I can not use Addhandler.Here is the simplest example of my problem:In this example error is "TextChanged is not an event of Object"
Dim obj As Object = TextBox1
AddHandler obj.TextChanged, AddressOf text_changed_event
I have to use this structure, because in a FOR loop I use some different UserControls as
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Addhandler For Unknown Object
Jul 16, 2010The addhandler function works this way: AddHandler Button1.Clicked, AddressOf Button1_Clicked, However, I have an unknown object: Dim o as Object, But I can't add handler for this object AddHandler o.SomeEvent, AddressOf SomeFunction, How do I add handler for unknown objects as stated above?
View 2 RepliesAddHandler In Master Page?
Sep 19, 2011been banging my head against this problem for days now. Hopefully somebody could point me in the right direction =) I have some button functionality in my Master Page:
Sub Run()
Dim Hbtn As Button = New Button
Hbtn.ID = "hLink"
Hbtn.Text = String.Format("H")
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Addhandler Is Not Firing Off In Rowdatabound?
Apr 26, 2009I am creating a dropdown list in code for a gridview. I want to create an addhandler so I can have access to the selectedvalue. However, here (Rowdatabound) the add handler does not get fired off. How should I go about this?
Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound
''//------------does not fire off add handler-----
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Asp.net - Send Parameter To Addhandler?
Jun 2, 2009I have a button in a grid that I created programmatically. The button edits some data in a table using data in a hidden column of the grid that the button is in. Normally I send a hidden field the row data using javascript onclientclick of the button then make the changes to the database using that hidden field. But there must be a way to send the addhandler of the button a parameter. This is the code i have to clarify....
Dim btnedit As New ImageButton
AddHandler btnedit.Click, AddressOf btnedit_Click
btnedit.ImageUrl = "imagesttnEditMini.gif"
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C# - Raise Event Using AddHandler?
Sep 28, 2009I am comfortable with Vb.Net events and handlers.how to create event handlers in c#, and raise events.
View 4 RepliesDoes An AddHandler Require Parameters
Oct 31, 2011I'm trying to add a handler, but as soon as I'm targetting a method that has parameters, the handler fails. This is the simple code:
AddHandler App.Current.RootVisual.MouseLeftButtonUp, RootVisual_MouseLeftButtonUp
Private Sub RootVisual_MouseLeftButtonUp(ByVal sender As Object, ByVal e As MouseButtonEventArgs)
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How To Pass Values Through AddHandler
Feb 10, 2011I'm trying to send values through addHandler. How can I do it.
View 2 RepliesLoop Controls To AddHandler?
Feb 20, 2012I have the following code to dynamically add handler to my controls
Private Sub HandleMyControls(ByVal Proc As EventHandler)
For Each c As Control In Controls
Select Case IsContainerControl(c)
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There are some subs and functions that help me in what to change and where to loop. My problem is that right now, I can set only .enter event of the control I tried to set parameter as Event but i got an error on that. So, what I want to do is something like this:
Private Sub HandleMyControls(Event as ???????, ByVal Proc As EventHandler)
If MatchControl(c) Then
AddHandler c.Event, Proc
End If
Passing Paramaters Through AddHandler?
Nov 2, 2010trying to pass an index as a paramater through the use if an addhandler. I know that the signatures have to be the same so its not going to work. What are my options?
Dim n As Integer = 64
Dim tmrTimer(n) As Timers.Timer
Sub startup()
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Trigger An Event With AddHandler?
Nov 29, 2009I am trying to build an add-on for some software. they are done using vb.net
I want to trigger an event called project selected but dont seem to get the option.
Ive selected the control but the event doesnt appear in the options list i can override the event by doing a Addhandler myControl.ProjectSelected, AddressOf newEvent is there any way in my newEvent method to run the orginal ProjectSelected event ??
VS 2008 Only Use AddHandler If In Particular Cell
Sep 6, 2009The below code snippet works well for making ALL the text entered into a row is entered in upper case. However I only want to force the upper case on the last column. I was thinking I could put a If Then before the It TypeOf to determine if I was in column 3 (and exit the sub if not) but I couldn't get the syntax right.
VB
' Begin Code Insert
Private Sub dgvEntryPeople_EditingControlShowing( _
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