Preventing Event Handlers From Triggering On Form Load?
Nov 25, 2008
Using VB 2008 Express I have a form in which a number of controls which have event handlers to monitor choices the user is making. The event handlers do work as expected, but the problem I'm having shows up when I load the form.For example, I have:
Code:
Private Sub RadioButton6_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton6.CheckedChanged
MsgBox("I got checked!", MsgBoxStyle.Critical)
End Sub
When I load the form in question from the main form of the program, I get the message box, even though the user hasn't actually clicked the radio box. The problem arises when I try to use a call to a function that works fine, as long as the entire form has loaded. Called prematurely, the function fails.How do I solve this so these event handlers don't trigger when the form is being loaded?
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Dec 9, 2011
This is a spin-off post from another issue I am working on. The problem is related to triggering event handlers when the user makes an input into a combo box, you might even call this a complaint.I have a combobox with a DataSource and ValueMember and DisplayMember. There is no DataBindings to worry about at this point. The combobox is DropDownStyle = DropDown and I havealso enabled AutoCompleteSource = ListSource and AutoCompleteMode = SuggestAppend.The datasource contains a list of Countires, and when the user types in an entry or chooses an entry from the combobox, I should be able to detect what the user has selected ortyped immediatley after the selection, some would say it's the very purpose of the combo box.Which event would you choose to deterine what the user has entered or Selected? few events come to mind:
SelectedValueChanged
SelectedIndexChanged
Validating
[code].....
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Feb 25, 2011
Is thier a way to sort the event handlers within a module/class/form Etc? The IDE add the next event handler and the end while I would like it to put it in place. For example I have already write some event handlers for a textbox named txtEmpname and I have another text box named txtphone. they are ordered in the module in the order created.(i.e. the txtempname_Gotfocus then the lostfocus, then txtphone_gotfocus) Now when I want to add a clcik event for the txtempname the IDE put it at the end while I would like it to put it just before the txtempname_gotfocus.
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Feb 7, 2011
The following zipped up Visual Studio Solution on Skydrive is immediately buildable and runnable; a usercontrol on a Form. Problem? If you click on any of the Edit Buttons and move the Horizontal Scroll, the values as they change in the Label_Values are off by one when you release the slider button. I think this is a timing problem between the Paint handler and the Horizontal Scroll event handler at the very bottom of the User Control code. Sorry I didn't eliminate
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Mar 30, 2009
I am using VB.NET for Windows applications. What is the difference between Load event,Activate event and Enter event in the Form and in which order the above event is executed.
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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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Nov 16, 2010
I'm trying to execute different code depending on the button clicked (button 4 or 5) on Form1, but when I click on button5 to activitae the code on the Form2's Load event everything is Ok, but when I click the back button to return to Form 1 and click on the Button4 to activate the code on the Form2's Load event again, it doesn't active the Form's Load event, is there a way to form the form load event every time I access it from Form1? [code]
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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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Feb 9, 2011
event handlers need to exactly match the event signature?
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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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Jun 11, 2011
I have a checkbox X1 that if checked it will check a column of checkboxes.What i'm trying to do is if the user unchecks at least one checkbox from the column it will uncheck checkbox X1. But I don't want it to run the event from checkbox X1 again because that will cause the whole column of checkboxes to be unchecked.
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Mar 6, 2011
I want to make something like an alarm clock. So, I want my programe to trigger a certain event at lets say, 8:00 AM and 16:00 PM.
I was thinking something with timers ticking every second and checking if the time I want is equal to the system time. But....I didn't manage to make it work. So, how do I make this work ?
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May 28, 2011
I have a TreeView object on my form, with check boxes. By the way, I'm working with vb.NET. I want it to perform a few different things with the aftercheck event:
If you check a node, check all its children
If you uncheck a node, uncheck the parent node
If you uncheck a node, uncheck all its children
The problem is when you uncheck a node, it unchecks its parent node, which triggers the event again and unchecks all its children.
Would there be a way to prevent the event from triggering a second time? Or will I have to give up on one of those two points?
Here's the code, if it helps any:
If e.Node.Level > 0 Then
If e.Node.Checked = False Then
If e.Node.Parent.Checked = True Then
[code]....
While I'm at it, is there a way to check if a folder is accessible? I've toyed with FileAttributes, but can't seem to find out how to make it work...
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Mar 31, 2012
I need a simple system that allows one process to check if another process is running (I think I can do that fine using Process.getProcessByName or similar) and then trigger an event in that process assuming it is.When I say trigger an event I do not mean that literally. I simply need to trigger a sub in the first process from the second.I know that IPC like this would normally be done with pipes or remoting or something like that but I have no experience with these and am looking for a quick solution, so unless these can be used relatively easily to solve this I am looking for an alternative.
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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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Jun 26, 2012
I'm converting an old VB form to .NET, and there a few Buttons which each have a corresponding ComboBox hiding behind them. The previous behavior was that you'd click the Button, and that would trigger the ComboBox behind it, which would then drop down a selection list. I believe the idea was to have a static color and text label (which cannot be a selectable option in the drop-down list), with the functionality of a ComboBox.
Now, in VB.NET, clicking on the Button (which is directly over the ComboBox in the form) won't trigger the ComboBox dropdown anymore. However, if I make the ComboBox visible enough to click on, it will trigger the ComboBox.TextChanged event, and show the drop-down (they're set to the DropDownList style). I've set the event handler to handle both that event and the Button event. I've tried Button.MouseDown, Button.MouseClick, and Button.Click -- none of which have worked.
I did find the SplitButton control option suggested here, which would probably do the job, but I don't want to have to integrate a non-native control for just 3 buttons. I don't really want to mess with the control template, either
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Jul 6, 2009
I'm trying to reset a form after a game has been played. I used checkboxes to indicate when the user picked a particular line item to update and then flagged the checkbox as checked and disabled.Once all the checkboxes have been checked, the game is over and I want to show a dialog (msgbox) that will allow the user to start a new game or exit the app. To reset the form, I was changing all the checkstates back to unchecked (along with resetting other variables), but the checkchanged events are being triggered and I end up in a loop.Is there a way to change the checkstate without triggering the event?[code]....
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Nov 6, 2011
Any sample code that will cause the logic coded in the clicked event of a Button to be executed, in Powerbuilder I would code it as
Button,triggerevent(Clicked!)
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Dec 27, 2009
I'm using a Datagridview my task is when the key F5 press using Keydown event executing some code
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Nov 1, 2011
I'm having a strange problem with the OnClick event. In an ArcGIS application using VB.Net, I have a button set up with the following
AddItem("CommandAnalyseResults")
The following module segment contains the OnClick event: Public NotInheritable Class CommandAnalyseResults
Inherits BaseTool <more code...>
Public Overrides Sub OnClick()
[Code]...
The OnClick event gets triggered no problem the first time I click on the button. However if I then close the window the button code creates and then click on the button again, the OnClick code is not triggered.
If I click on a different button then click back on the 'problem' button a 2nd time, it does seem to trigger the code!
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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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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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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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Feb 4, 2009
how many handlers are tied to an event?
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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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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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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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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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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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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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