Remove All Eventhandler From Specific Event Of Control During Runtime?
Dec 29, 2009
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
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Dec 13, 2011
I'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:
[Code]...
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Nov 5, 2010
In C#, I could do something like this:
EventHandler handler = this.SomeEvent;
...which would allow me to, for example, do:
Delegate[] attachedHandlers = handler.GetInvocationList();
In VB.NET, I can't seem to figure out how to do a similar thing.
This doesn't work:
Dim handler As EventHandler = Me.SomeEvent
...due to the following error:
Public Event SomeEvent(sender As
Object, e As EventArgs)' is an event,
and cannot be called directly. Use a
'RaiseEvent' statement to raise an
event.
But this doesn't work either: [Code] So how can I actually get an EventHandler from an event in VB.NET? The only idea that's immediately coming to mind is to use reflection, but that seems pretty ridiculous.
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Nov 24, 2009
Ran into this while converting a VB.NET interface to C#; the VB version defines an event which doesn't conform to the typical (object sender, EventArgs e) signature:
[Code]...
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Jan 3, 2010
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.
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May 25, 2012
During 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
[Code].....
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Apr 18, 2011
Here's my problem i am trying to extract data from a forum
Now what i want is to remove a specific word from only a specific line
So here's a example
[quote=randombla13] I am the king of the world bla bla
[img]http//google.com/img.jpg[img]
[quote]This line should not be removed[quote]
[quote]
Now as you can see these are the codes you may have seen in many forums
Now want i want .Net to do is filter the the content in a textbox
And remove only the lines marked with red "[quote=randombla13]" from the first line
And the Extra "[quote]" from the end line
As you can see in the example the content has two "Quotes" so i jest want to remove only one from the first line and last line of the content
And note "[quote=randombla13]" the length after the = is Unknown it maybe of 6 characters or less or more
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Dec 20, 2010
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"
[code].....
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Jul 31, 2010
I've read thru Iceplug's tutorial on control arrays and got it working. I tried to add a new event by basically copying his click event code and calling it a doubleclick event. I used the proper addhandler and assigned the correct name to my sub. I have the click event changing the background color to blue and the doubleclick event changing the background color to green. The background color does not change to green. Why?
Heres the tutorial with my new code encased in asterisks ...
Code:
Imports System
Imports System.Windows.Forms
Public Class form1
[CODE]...
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Dec 8, 2010
Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click[code]...
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Mar 11, 2010
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
[Code]...
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Aug 11, 2009
I'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]...
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Mar 4, 2011
how to remove controls during runtime... here are some of my codes... but this is only for adding the control...
[Code]...
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Jan 10, 2012
I have a gridview that is populated by a dataset and I want to remove the specfic item that the user selected in the gridview
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Sep 15, 2011
We are developing an application that looks like this: Mainwindow - PaneGroup - Pane
What we want to do is add a handler (AddHandler Pane, AddressOf MethodName) on the mainwindow and throw the event in the Pane. When we want something to change on a collection in the mainwindow, we throw that event in the Pane.
My question is if the pane is removed from the panegroup (doesn't exist anymore), does that handler still live on the mainwindow?
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Jan 24, 2011
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
[Code].....
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Jul 2, 2010
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
[code]....
how can I remove this by marking/ touching with mouse one value and click on the keyboard "del"?
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Apr 8, 2010
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.
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Sep 19, 2011
Trying 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)
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Oct 29, 2011
I want get the most specific from the current url in visual basic .net.I've tried several code but it just was the same.I have this code:
Dim CurrentURL1 As String = Request.Url.PathAndQuery
The code will result like: /FolderName/CurrentUrl.aspx
What I want is, just get the 'CurrentUrl.aspx'.How to get that?
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Jul 1, 2010
How can you remove a specific line from a listbox? How can you like make it so instead of password it would show ******* but on a listbox because it doesnt have passwordchar option. and how can you make it save the listbox data in the my.settings
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Jun 10, 2011
I want to remove the lines that contain specific text. (Whole Line)
[Code]...
So textbox1.text will become and remove whole line that contains the word "daniweb"
[Code]...
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May 11, 2011
Private Sub paint_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
and uses the E.graphic.Drawimage function
[code]....
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Nov 15, 2011
I tried this code to remove specific Rows that the column(0) cells equal= 0
For i As Integer = 0 To Form1.DataGridView1.Rows.Count - 1
Form1.DataGridView1.Rows.Remove(Form1.DataGridView1.Rows(i).Cells(0).Value = 0)
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Mar 12, 2012
I have an existing menu structure created at design time. During runtime, I want to add a submenu to one of the already existing menu items created at design time.How do i add a dropdownitem at runtime to an already existing menu item? How do I refer to that existing menu item?All positings I found so far either create a main menu item and directly create the submenus. Apparently, the reference to the main menu item was somehow established.
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Mar 23, 2010
i want to create buttons at runtime using vb.net. In my form have 1 textbox and 1 button. at runtime when we input number in textbox than click ok, the button will create follow in textbox and this value it remeber when we run again the buttons will load follow the last number in textbox, when we input new number in textbox it compare small or big than last value. if big add. for location like this
1 2 3
4 5 6
7 8 9
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Aug 10, 2010
im trying to find a specific text in a textbox and remove it . i don't figure a way to do it .
If richtextbox1.text.contains(listbox1.selecteditem) then
' there i dont know how delete the text !!
end if
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Jul 4, 2010
I'm making a button to delete lines not containing specific text.
For example, if the text is "test". I want to remove all lines not containing "test" in it.
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Jan 15, 2010
Say I have a listbox, and the items in the listbox look like this:
#COLORS#
GREEN
BLUE
BLACK
#NAMES#
BOB
JIM
BILL
#ETC#
How would I make it to where when a user clicks a button, all the text between #COLORS# and #NAMES# is removed? Let me know if you need more detail
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Jan 18, 2011
I have a form with four checkboxs and a textbox for an id number.I also have two tables in a database. The first has a column for the users Id, Name, and a column called Points.The second has a column for Id and one called Letters.What i want to do is, after the user enters the id number, and the user clicks checkboxA it should add a certain number, lets say 5, to the "points" cell for that id#(in the first database), and it should put the letter "a" in the "letters" column (of the second database) for that id number. Also, if a user deselects a checkbox it should remove the "a" from letters and subtract 5 from points.Also there will be different letters in the "letters" cell, so i cant just clear it, but i have to remove the specific letter.
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