I want to after clicking on button2,after that if i click on button1 then msg is not displayed Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
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I ma using DevExpress controls (which doesnt matter for this example). I have a lookupEdit control and I never want the EditValue_Changed event to fire. Can I use RemoveHandler to do this? If so can someone give me a code example of doing this? Should I put RemoveHandler in the load event of the user control I am creating? Or does it go in the EditValue_Changed event of the lookupControl?
View 3 RepliesI create Context menu at runtime depends of text in selected cell of datagridview.
Like this:
With ContextMenuStrip1
.Items.Clear()
Dim Str As String = DataGridView1.Item(1, DataGridView1.CurrentRow.Index).Value
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And as vbnet beginner with this code I can't get text of fired menu item in event handler.
Some controls are dynamically created within a panel. Their event handlers are attached
Dim btn as new system.windows.forms.button
with btn
'set properties
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I have a TableGridLayout (6 x 6) which host 36 buttons created at design time.From the 36 buttons, only a handfull maybe needed at anyone time depending on data retrieved from an SQL database.Everytime I need to 'clear' the grid to populate with new items, I clear the text of each button, make it visable if required and then upadate with the new text.On every pass if a button becomes active, I add an event handler to the button like this.[code]...
View 4 RepliesI'm writing a small 2D engine that uses Lua to control it. I've been setting events up in between the Lua and the VB.net for the past little while here. The problem, I've realized, is that is that I can't seem to remove the events which is screwing up quite a few things (because they are being called when they should be done with). To fix this, I wanted to add some kind of way to remove the specific event handler.
I know how to add an event handler:AddHandler Button1.Click, AddressOf Button1Clicked
But with this in mind, is their a way to remove a specific event handler in the VB.net? I didn't explain this very well: If I have this:
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When I've used the remove handler method in my code, I get this warning: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.Why do I have to assign the "AddressOf" expression to a variable?
View 6 RepliesI have a Timers.Timer called COMTimeout, to which I add an event handler using:
AddHandler COMTimeout.Elapsed, AddressOf TimeoutEvent
however, the handler may also be:
AddHandler COMTimeout.Elapsed, AddressOf SecondTimeoutEvent
I now need to remove the handler, is there a way to do it without knowing the name or do I need to keep track of which handler as been assigned?
VB.NET RemoveHandler & Anonymous Methods
If I add an event handler like this:
AddHandler s.Click, AddressOf Panel1_Click
How can I can then remove the event handler?
Private Sub Panel1_click(ByVal sender As Object, ByVal e As System.EventArgs)
' Remove code
End Sub
How do I add an event Handler to a control, for example a textbox, to handle any keypress event?cause I want this textbox(which is added in program runtime) to only accept any convert any small letter to Upper case.
View 2 RepliesDuring the process of my program I am creating several different buttons depending on what file the user selects. I have been able to create these buttons and I would like to set up the event handler so when the user selects one of these buttons it pops up a message box that shows the user the name of the button they just clicked on. The message box isn't the goal of what I would like to do with it but If I could get that to work I would be able to alter the code to get it to work the way I want it to.
Below is my code that I currently have. I don't have the event handler doing anything at this time as I can't seem to get it to work I am still playing around with it.
ublic Sub resizebuttons()
Dim X As Integer = 175
For Each item As String In CSVInput.selected
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How to remove a handler set up by a lambda expression? According to this MSDN article, lambda expression should be assigned to variables which should be used to define handler operators. So far, I have used lambda expessions w/o variables.
For instance, the following works:
Private Sub ScaleObjectInit1(ByVal objSrc As NumericUpDown, ByVal objTgt As FrameworkElement) ...
AddHandler Me.upDnScale.ValueChanged, Sub (sender As Object, e As Object) ScaleObject1 (sender, e, objTgt)
End Sub
Private Sub ScaleObject1(ByVal sender As Object, ByVal e As Object, ByVal objTgt As FrameworkElement)
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I am having a problem with the cellvalidating event constantly firing when the datagrid is refreshed (since the trigger that fires the event is the originally selected cell losing focus).I would like to remove the event handler for this at certain points of my code so that it does not fire but the examples I have come across on MSDN don't appear to do anything, so I guess I must be doing something wrong.[code]
View 1 Repliesto know if a control have any handler. I have a dgv and in the editing control Showing event i add an event handler like this: VB AddHandler e.Control.KeyPress, AddressOf Grid_KeyPress_NumbersOnly This event it's added in some of the columns and for the other ones i remove it... The problem it's when the user, for example selects 3 columns where the event it's added, then if the user selects one where the event it's removed, it doesn't remove all handlers... So i have 2 solutions, when removing i put multiple removes or the other check if the event handler it's added doesn't add again. I prefer this second option, but i don't know how to check if the event it's added?
View 3 Repliesremove 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?
Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click[code]...
View 5 RepliesI'm trying to remove a parameter from my Update Adapter, and I can not get it to work.
I found some code on these forums to do it but I can't get it to work. [code]...
how to remove controls during runtime... here are some of my codes... but this is only for adding the control...
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What's the best way to dynamically remove method calls at runtime? Essentially what I'd like to do is pass a parameter to my application. Let's call the parameter level. Depending on the value of level, I'd like to essentially remove all the calls that have higher levels. I have the following but was wondering if there were a simpler/cleaner way to remove the calls:
Ideally I'd really like to write something like:
Log5("message")
And just have Log5 work or not call if it doesn't exist. My goal is to actually remove the call. The overhead for calling level 5 logs that test and return is fairly high and I rarely use it.
Module Module1
Delegate Sub Log(ByVal message As String)
Public Log1 As Log = Nothing
Public Log2 As Log = Nothing
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I found this in the internet to add values to a combobox:
Private Sub ComboBox_Matricula_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles ComboBox_Matricula.KeyPress
If e.KeyChar = Chr(Keys.Enter) Then
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how can I remove this by marking/ touching with mouse one value and click on the keyboard "del"?
I have till now used this code to bring the picture boxes on my form (there's an array of picture boxes).I want to keep a button on the form. which when clicked would remove all the picture boxes on the form.
View 10 RepliesTrying to remove shortcuts from a contextmenu at runtime. The shortcuts are added at runtime btw.
Private Sub conmnu_xsyn_PopupOpen(sender.....
conmnu_xsyn_undo.Shortcuts.Add(eShortcut.CtrlZ)
conmnu_xsyn_redo.Shortcuts.Add(eShortcut.CtrlY)
[code]....
This works fine, but now I'm trying to remove them when the contextmenu closes. I've tried several events (popupclose, disposed) , but nothing seems to work. Perhaps someone know how it actually works. The code I use to remove a shortcut is simply:
conmnu_xsyn_undo.Shortcuts.Remove(eShortcut.CtrlZ)
I do have a customized treeview which inherits from treeview. The customized treeview offers - amongst other - the functionality to automatically check/uncheck the child and parent nodes according to the selected node.To do so, I use (or mabye abuse?) the AfterCheck-event of the treeview in the class where the inherited treeview is customized. Code looks like that (Submethods not included):
[code]...
I temporarily remove the AfterCheck-Event in the event-procedure to avoid it getting fired when I programmatically check/uncheck the checkboxes of the treeview. Works fine so far, only problem I see: if another programmer wants to use the customized tree view and tries to make use of the After-Check-Event, he'll get caught in an infinit loop, because his own After-Check-Event (he added himself to the treeview) was not removed and keeps on firing every time a checkbox is automatically checked/unchecked.
How can I remove ALL methods linked to AfterCheck-Event without knowing which method someone added to the treeview-control? My guess is to use reflection and to get the underlying delegate of the AfterCheck-Event by using the .GetInvocationList somehow - but I was not able to make it work.
Feraud
I am having some trouble understanding the different aspects of Event Handling. Of course, I know how to use "WithEvents" and "Handles". However, I have created some interdependent Custom Cotrols. I will try to describe this, and then post some code.
Assume a Custom Control 'GroupedListHeader", an instance of which is created by, and added to the controls collection of another Custom Control, "GroupedListNode".
GroupedListHeader adds an Event handler "OnHeaderClick" During initialization which hanndles several different events. As part of the handling in "OnHeaderClick", GroupedListHeader raises one of several Events which GroupedListNode in turn handles, again by using "AddHandler" during initialization. And so on. The events can propegate up through a chain of sub-components of my final control. I understand that I am supposed to use "RemoveHandler" somewhere, at some point, when I use "AddHandler". This is where my questions arise.
A. In the cases where I have used "AddHandler" to handle a custom event sourced by a sub-component, I get the following Waring:
Quote:
Warning2The '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.C:Documents and SettingsSuper God-like UserMy DocumentsVisual Studio 2008ProjectsGroupedListControlTestAttributesNode ComponentsGroupedListNodeBaseII.vb27446GroupedListControl
I am not quite sure what this is about, other than it seems to relate to trying to Remove a handler which is referencing another Custom Event.
An Example (The two in red are the source of the Warning): 'Added during the Constructor Method, after "InitializeComponent and some other Drawing-related Stuff:
AddHandler moTGHeader.Expanded, AddressOf Me.OnExpand
AddHandler moTGHeader.Collapsed, AddressOf Me.OnCollapse
AddHandler moTGHeader.Selected, AddressOf Me.OnSelect
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I should note futher that the component indicated above further propegates these handled Events upward to the parent of this component, where again, the same issue exists. What is it that makes the two items in red different from the others that they would cause this warning? How critical is it that I use "RemoveHandler" in this context? These events should persist until the control goes out of scope. Also, this is just an example; at several other levels in the hierarchy, I am doing the same thing. My understanding is this can result in objects retaining references to the Handlers(?) or something like that.
How to remove or change the form back gorund image to "none" through runtime?
View 7 RepliesHow do I get a Event Handler to fire from within a nother Event Handler?
View 6 RepliesThe 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
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I have created multiple dropdown list at runtime and populated with data. I also have added an eventhandler to determine the selected value of the drop down list.
The code is as follows :
Dim tbl As New Table()
tbl.EnableViewState = "true"
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I have a Visual Basic 2005 program which runs fine if I execute the built Executable. However if I start the application in VS2005 debugger it gives a weird error
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Just had to remove remove statics and use Delegates refering to class. i have got a little problem in one of my project.I need help to resolve it.My application Connect several FTP server with the same Class.I'm using TCPclient for few specifics Commands.The problem : All threads call the same TCPclient wich can't connect several server at once.I would like to create a New TCPclient for each thread.
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