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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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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C# Event Handlers Automatically Created By WinForms Designer?

Jun 18, 2010

Just moved from VB.NET to C#.In VB to connect and Event Handler to a Sub we use the Handles clause.From what it seems, this do not exist in C#. After creating a simple application with a button I realize that Window Forms Designer automatically created an EventHandler to my button1_Click function (after I double clicked it), in Form1.Designer.cs with this code:

this.button1.Click += new System.EventHandler(this.button1_Click);

But, in VB, the WinForms Designer create the Handles clause in my class, in the function header. So, C# create the default EventHandler in designer file, while VB creates in main class where control resides.

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Event Handlers For Dynamically Created Controls

Aug 2, 2009

I'm not seeing anything about event handlers for dynamically created controls.. and I could have sworn I had once before. I did see one post about the topic, but it was just replied by asking for some posted code, so as in a preemptive move..

Private Sub buttonCreate()
Dim newbutton As New Button
newbutton.Height = 39

[CODE]...

Here's what I'm trying...

Private Sub newButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles newButton.Click

End Sub

Here's the errors I recieve...QuoteHandles clause requires a WithEvents variable defined in the containing type or one of its base types

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Link Dynamic AddressOf Operator To Their Separate Event Handlers?

Oct 2, 2011

I put several buttons dynamically on a form, and then try to link them to their separate event handlers with the following (simplified) code:

[Code]....

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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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[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 Controls At Runtime

Oct 21, 2009

I have a WinForms application that I need to dynamically add controls to at runtime. I searched for this and I was initially led to the TableLayoutPanel (TLP).

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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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Adding An Event To A Dynamically Created Textbox - Windows Forms App?

Jan 27, 2012

OK, so my project is like this:The user selects a folder from their computer that holds a list of subfolders. The program then dynamically inserts a check boxes per subfolder within a seperate cell of a Table Layout Panel.I want to and a simple Click event to each checkbox control so that when a control is clicked, it counts all of the check boxes on the form that are checked.How do I go about adding the event handler to the checkboxes when they are created. Here is the code that adds the checkboxes:

Dim iCol As Integer = 1
Dim objFolder As Object = Nothing
For j = 0 To rCount - 1 '0 to dynamic number of rows

[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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Panels / Tabs And Buttons (which Are What Need To Be Rearranged) Are All Dynamically Generated

Mar 11, 2011

To set the scene, I have implemented a drag and drop rearrange in a FlowLayoutPanel (thanks to a few good Tutorials) which worked absolutely fine until the client decided that he needed many Panels each contained in the Tabs of a Tab Control.Ironically the FlowLayoutPanel rearrange still works if the panel is not in the Tab Page. However the moment it is it stops functioning completely.In all honesty its probably a simple issue that I'm missing but I can't seem to find an answer. I'm certain that the issue is in the following block of code, most probably in the following place:If controlcoll(i).Bounds.Contains(mouse.X - flow.Left, mouse.Y - flow.Top) Then Either that or in a property of either of the controls. [code] The Panels, Tabs and Buttons (which are what need to be rearranged) are all dynamically generated.

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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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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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