C# - Adding Own Event Handler In Front Of Other Event Handlers

Sep 24, 2010

When I utilize AddHandler in VB to add my own method to the Click event :

AddHandler Button.Click, AddressOf myButton_Click

I see that my code executes last - after other event handlers for the Button_Click event. Is there a way to insert my event handler in front of other events so that it executes first?

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.net - Event Handler Is Never Called Because The Original Event Is Raised In Another Event Handler?

Apr 18, 2011

The event handlers in my parent class are never called though the events are raised in the child class.

The Code:

Public Class childForm
Public Event checkboxchangedEvent(ByVal checkbox1 As Boolean, ByVal checkbox2 As Boolean)
Private Sub checkboxchanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CheckBox1.CheckedChanged, CheckBox2.CheckedChanged

[code]....

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[2008] Adding Try Catch For All Event Handlers Using Macros?

Jan 28, 2009

i want to automatically add all the events of the activeform under try catch block.i am using a simple code which puts the selected code of ActiveDocument under try catch ( using DTE.ActiveDocument.Selection )i have to manually select each event's code and apply the macro, which does not seems to be a very good idea.

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.Net Event Handlers Priority - Adding Listeners To The C#.Net Library Object

Mar 29, 2011

I am having the library in C#.Net. If I am creating the form in C# and adding listeners to the C#.Net library object the event handlers called immediately. IF I am creating the form in VB.net and adding listeners to the C#.Net library object, the handlers are called after some time. Do we have any priority to be set the event handlers

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Winforms - Dynamically Adding Event Handlers To Dynamic Panels?

Mar 31, 2012

so i have a series of panels that are generated

example:

For i as integer 1 to dt.rows.count
dim subpan as new panel
*Code for creating panel"
Next

the problem is i need to be able to add event handlers to each of them including, click, mouseEnter and mouseLeave but i can't figure out how to index each panel so that they can be accessed and identified. i tried using a property but that didn't seem to work or i was doing it wrong.

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VS 2010 AddHandler Not Adding Second Event Handler For Control?

Jan 6, 2012

I am playing around with Drag and Drop, and I am having an issue with AddHandler. I am creating labels and displaying them on a form. Before I add each label to the form, I add 2 event handlers (DragEnter and DragLeave). When I run the code, it hits the first event handler (DragEnter), but doesn't hit the second event handler (DragLeave). Either I have coded something wrong, or the second handler is not being added.

Here is my code (note this is just something Im playing around with for learning):

Public Class Form1
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

[Code]....

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VS 2010 Dynamically Adding A Keypress Event Handler?

Oct 16, 2011

I'm new to VB and trying to add a Key(Down? Press?) Handler to a dynamicly created textbox. The error I get is "'KeyDown' is not an event of 'Object'". How do I fix this?Here are the relevant parts of my

Public Class main
Structure square
Dim box As TextBox
Dim guessedVal As Integer
Dim correctVal As Integer

[Code]...

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.net - Do Event Handlers Need To Exactly Match The Event Signature

Jan 27, 2011

I would like to do something like the following:

Public Class Form1
Public Event Evt1(ByVal c As c1)
Public Event Evt2(ByVal c As c2)

[code]...

However, it seems to be invalid syntax, as the signature of OnEvt1OrEvt2 doesn't match that of Evt2.

Edit: The above code seems to work fine for everyone but me, but it doesn't compile for me in VS2005 SP1.The error message is something like:Error BC31029: The method 'Private Sub OnEvt1OrEvt2(c As WindowsApplication1.c1)' can not handle the event 'Public Event Evt2(c As WindowsApplication1.c2)' because the signatures do not match.

[code]....

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Event Handlers Need To Exactly Match The Event Signature?

Feb 9, 2011

event handlers need to exactly match the event signature?

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VS 2008 Using More Event Handlers To A Handle The Same Event?

Mar 6, 2011

is it allowed to use more than one Sub to handle the same event ? For example , may I have 2 separate subs to handle the Load event of a form ? Will they fight each other ?I have tested it and it seems to work fine , nevertheless I thought I'd ask you . In case you wonder , there is no great deal , I just want to copy the same lines of code in more forms so I am doing it just in favor of the looking aspect .

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Firing An Event Handler From Within A Nother Event Handler?

Aug 27, 2011

How do I get a Event Handler to fire from within a nother Event Handler?

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Airline Reservation Application - Creat An Event Handler For The FlightBindingSource's PositionChanged Event?

Nov 27, 2010

I'm trying to complete this airline reservation application, but having a problem in this part of the question:Creat an event handler for the FlightBindingSource's PositionChanged event: select FlightBindingSource in the class Name combobox then select position changed in method name combobox to creat the FlightBindingSource's PositionChanged event handler. Write a code to access the currently displayed flight object and pass its flightNumber to method DisplayPassengers as a decimal.This Is my code so far:

HTML

Public Class AirlineReservationForm
Private database As New ReservationsDataClassesDataContext()
Private Sub FillAll()[code].....

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Event Handler For Dynamic Controls - Add An Click Event To Labels

Oct 20, 2009

Below I create an array of labels. I would like to add an click event to my labels. Can someone point me in a direction?

[Code]...

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Remove An Event Handler From Within The Event Handler?

Mar 21, 2012

remove an event handler from within the event handler?

I have a class that gets data from a hand scanner. When the scan is complete and the data is validated, the class fires a custom "ScanComplete" event and returns the data in a custom EventArgs.

In the calling program, I'm creating an instance of the scanning class and adding a handler for the "ScanComplete" event. In the event handler I get the data that was scanned and then remove the handler.

It seems to be working but it feels wrong to remove the handler while I'm running inside the handler. Will this cause a problem?

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How To Use Event Handlers

Jul 11, 2010

I have a panel control on a win form, to which I dynamically add a custom control.The custom control inherits UserControls and in the New() sub, I assign the control a GUID.When a control is added to the form, a variable of type List(Of T) holds the details of where i put the control and the size of it.

Within the custom control class there is a delete method. When the method, which deletes the custom control, is run I want the details of that custom control removed.I think I need to use event handlers but I do not know how to handle these when the controls are added dynamically.

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.net - AddHandler Only If No Handlers For Event?

Jan 25, 2010

I 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

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Add Event Handlers To Controls?

Apr 27, 2010

I have a problem, in Winform or mobile developing, When I newed some buttons in my code(never drew on the form), how can I add the click events to them and use it?

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Create One Event Many Handlers?

Oct 17, 2009

How do I create an event with many handlers. I use the followingo code but it failed. Am I missing something?

Protected Sub myhandler_CheckedChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles CrdCb1.CheckedChanged, CrdCb2.CheckedChanged
End Sub

[code].....

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How Many Handlers Are Tied To An Event

Feb 4, 2009

how many handlers are tied to an event?

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How To Re-connect Event Handlers

Apr 21, 2011

I was editing my code and after deleting a button from a toolstrip vs locked up and trashed the designer.vb code. Now I have all my form code but many of the control objects (e.g. buttons, listviews ..etc) have been deleted. I've re-added the control but none of the events associated with the control (e.g. _click) work. If I delete the event handler code and add a new one the paste in the code it works fine

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Remove All Event Handlers In One Go?

Jul 19, 2009

Problem: I have a document class which contains a list of objects. These objects raise events such as SolutionExpired, DisplayExpired etc. The document needs to respond to this.

Documents can sometimes exchange objects, but a single object should never be 'part' of more than one document.

My document class contains a bunch of methods which serve as event handlers. Whenever an object enters the document, I use AddHandler to set up the events, and whenever an object is removed from the document I use RemoveHandler to undo the damage. However, there are cases where it's difficult to make sure all the steps are properly taken and I might thus end up with rogue event handlers.

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VS 2010 - How To Use Event Handlers

Feb 20, 2012

I am trying to do sum custom events in a Class. My class listens for a UDP Broadcast, I want to Raise and Event when a message is received to display the message from a windows form.

Here is my code.
Public Class UDP_Broadcast
Public Event NewMessage(ByVal Message As String)
Public Port As Integer = 2456
Public Sub Receiver_Load()
Dim t As New Threading.Thread(AddressOf listen)
[Code] .....

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When Do Event Handlers Subscribe

May 19, 2011

I have a form that is derived from a base class. When the form is created a behavior class is also generated that handles event management, bindings, etc...

I create a form instance(FormFoo). When the associated behavior class is created it has a method in it with a signature of: grid_EventA(....) Handles grid.eventA

I want to handle EventA in FormFoo instead of the behavior class so I remove the handler that was generated in the behavior class and add a handler that points to a method in FormFoo. This all works just peachy. The event is properly handled in FormFoo only.

Next I instantiate a modal form(FormBar) via a button click in FormFoo. I then close FormBar. Now we have a problem.

When eventA fires it is now handled from the Event handler in FormFoo AND in the behavior class associated with form foo(bad).

Is the event handler in the behavior class(grid_EventA(....) Handles grid.eventA) getting resubscribed when the form gets focus again? I don't understand how that event is getting resubscribed.

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Add Event Handlers For MouseMove And ButtonEnter?

Jun 20, 2012

Alright my goal is to test to see if the user has dragged a label over a button. I have add event handlers for MouseMove and ButtonEnter, the trick is that i dont want the buttonEnter sub to fire unless the user is actually dragging a label.Dim dragging As Boolean = False

[Code]...

I thought would work but because the user is dragging the label the mouse never actually enters the button field. I also tried doing lbl.location = button.location... but unless the label and the buttons are the exactly the same size in exactly the same location then the event wont trigger.

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Add Event Handlers To A Program Through The Compiler

Oct 7, 2011

Isn't the a quick way to add event handlers to a program through the compiler? I'm trying to make a label change color when it's moused over.

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Asp.net - Define Event Handlers In An Interface?

Nov 12, 2010

I am making an interface that has a number of events defined in it. When I implement the interface in a class the events will show up. I want to force a class that implements my interface to also have to make the event handlers too. I don't care where the class raises the event, but I want them to have to define what happens once the event is raised. Is this possible and if so, how do I do it?

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Avoid Duplicated Event Handlers?

Mar 22, 2011

How do I avoid an event from being handled twice (if is the same handler?)

Module Module1
Sub Main()
Dim item As New Item

[Code]....

I want the event manager to detect that this event is already handled by this handler and so it shouldn't rehandle (or readd) it.

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Backgroundworker And Objects That Have Event Handlers

Feb 9, 2012

I've started working with the backgroundworker class to try and keep the UI responsive while I make some expensive API calls. One of the API classes (details here[msdn.microsoft.com]) has its own event handler which I am using to update a progress bar in a small form that pops up. So I'm looking to use the PublishPackage command in a bgw thread and update a progress bar on the UI thread by using the ProgressHandler method.

[Code]...

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Dynamically Creating Event Handlers?

Apr 9, 2010

in my project I create buttons dynamically

For i = 0 To btns.Count - 1
btns(i) = New Button()
btns(i).Text = names(i)
btns(i).Size = New Size(btns(i).Text.Length * 15, 25)

[code]....

I need to specify a handler for each button that retrieves the button text how can I do this?

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Event Handlers Fail After C# To VB Conversion

Mar 20, 2012

Visual Studio 2010 I am trying to learn Caliburn Micro. The sample project is presented in C# only (and runs OK) I have tried several on-line C# to VB converters, without success. Well the conveersion runs without error - - - but the Visual Studio editor chokes on the results. The principal problem seems to be with (what looks to me like) a Lambda. Advanced code conversions are really tough in any case, - but when you do not know C# nearly impossible.

[Code]...

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