Know If A .net Event Is Already Handled?
Aug 13, 2010
I've written some code to handle an event as follows:
AddHandler myObject.myEvent, AddressOf myFunction
It seemed that everything was working at first, but when I ran the debugger, I discovered that oftentimes, myFunction would run several times each time myObject.myEvent fired. I figured out that I had allowed the code to add the event handler to run more than once, resulting in this behavior.
Is there a way I can do something like this?
If myObject.myEvent is not handled Then
AddHandler myObject.myEvent, AddressOf myFunction
End If
View 4 Replies
ADVERTISEMENT
May 7, 2009
Check out this code. Basically, the event frmStart.Next_Clicked() is not being handled in the class MappingWizard, and I'm not sure why.
CLASS MAPPINGWIZARD - To start the "Mapping Wizard", a new instance of MappingWizard is created and MappingWizard.Start is called.
vb.net
Public Class MappingWizard
Private WithEvents fStart As New frmStart
[Code]....
the procedure Start_Next_Handler() never gets called in MappingWizard when the Next button in frmStart is pressed.
View 3 Replies
Jun 22, 2010
I am trying to add to items to a combobox by using the "enter" key. It does work when I add the first item, but if I manually clear the box and add another items it does not get added to the list.
(1) I click in the combobox and type "hello" and press the "enter" key
(2) I click on the dropdown arrow and see that "hello" is in the list
(3) I select "hello" in the box and erase it, item is still in the list
(4) I type "goodbye" in the box and press the "enter" key
(5) "hello" is still in the list but "goodbye" is not
Here is the code:
Private Sub CopyrightCombo_Keypress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles CopyrightCombo.KeyPress
If e.KeyChar = Microsoft.VisualBasic.ChrW(Keys.Return) Then
[code].....
if I comment the if/end if line and type "hello" the items added to the combobox list are: "h", "he", "hel", "hell", "hello" wich makes sens since the add items is run on every keypress? I know that my commands for adding items is good, I know that my keypress event is handled properly but not when I specify using the "enter" key.
View 3 Replies
Oct 26, 2009
I discovered that an event raised (directly on indirectly) in the constructor cannot be handled outside the very class. To prove if that was the actual problem, I wrote a simple exemplary app.
Class with the event:
Namespace Utils
Public Class A
Public Event Test()
Public Sub New()
CallTest()
[Code] .....
The reason of such behavior became quite obvious after writing those pieces, but maybe there is a way to omit it?
View 2 Replies
Jun 21, 2010
I am back with a problem again I have a grid and I am trying to implement sort for it.Basically I have binded the data manually to the grid now my problem is I do not know the code to be written for the sorting event:( some how managed to get the code for the page indexing :-/,...doesnot have much idea!! could you !!"experts" help me out by giving me some hint or sample code in VB.Net:icon_exclaim: unable go ahead further:
View 1 Replies
Jul 20, 2009
If I set a .ascx control's visible attribute to true, what event is called? What method can I create in that control's codebehind to act on this event?
View 1 Replies
Mar 13, 2011
I was just wondering if there was a way that I could get the properties of each item in a sub that was linked using AddHandler.
As in, say I have three PictureBoxes that I created and added to a sub using AddHandler. How can I get each of these PictureBox's properties? (I'd imagine it would be using a For Each loop?)
View 1 Replies
Nov 5, 2009
I have a winforms app and my code works fine.But I want to know if my code is bullet proof or if it only works without load.Let me explain it:I have a windows form where I have overridden the OnKeyDown method:
Protected Overrides Sub OnKeyDown(ByVal e As System.Windows.Forms.KeyEventArgs)
dim args as new ActionEventArgs(ActionType.Bark)
RaiseEvent Action(me, args)[code].....
Now I have a class that is registered to this event and, if it knows how to handle the ActionType it sets Handled to true.
Public Sub actionHandler(ByVal sender as Object, e as ActionEventArgs) Handles me.Action
If e.Handled then return
If e.Action = ActionType.Bark[code]....
I tried this code at my developer machine and it seems to work. In the OnKeyDown Method, everytime I query the Handled variable, my actionHandler method did run first.But I asking me if this is only the case because my developer machine is in idle state and the event queue is processed so fast or can I expect the
RaiseEvent(...)
method to wait until every registered EventHandler has finished it's taks?
View 2 Replies
May 13, 2009
I'm using a TcpClient to try and connect to a server. I have the following code, which uses valid IP addresses and ports:[code...]
My problem is that the server I'm using is my own, and when I intentionally don't have it running, an exception occurs whenever I try to access any of TCP_SENDER's properties (in the example above,
the "SendTimeout" property throws the exception, but any other property has the same behavior). The exception thrown is "No connection could be made because the target machine actively refused it.
This exception is expected since I don't have the server running (and sometimes in real-world scenarios I won't), but the real issue is that the "Try/Catch" block I have won't catch the exception.
If I run the code above when the server is down, the "Catch ex as Exception" code is never reached; instead the program just throws the above-mentioned exception with its green font at the "Why can't
I catch the exception? Even if I give trash inputs to the system I should still be able to handle any exceptions that might occur, right?
View 4 Replies
Feb 5, 2011
I have a VB.NET application (VS2010, .NET 4.0) that seems to throw an exception under some unknown conditions after a number of hours. In addition to the main thread, there are additional threads running. In reading this link: [URL] it seems like this would be a big help in trapping this exception. I have what are probably some very basic questions:
1. I assume ErrorHandlerForm() in the example refers to the main form of the application, setup.vb in my case. Therefore the last line in the example should be:
[Code]...
I would have expected to to replace ErrorHandlerForm.Form1_UIThreadException with find a setup event such as Setup_UIThreadException but there doesn't appear to be sucn an event.
View 11 Replies
Apr 18, 2011
I set timeout for 30 mins in web.config like below
<forms name=".FormsAuth" loginUrl="/Login.aspx" timeout="30" protection="All"
slidingExpiration="true" >
<sessionState mode="InProc" stateConnectionString="tcpip=127.0.0.1:42424"
[code]....
View 2 Replies
Feb 21, 2012
Is it possible to catch the combined key presses of Ctrl-Alt-Delete so that event can be handled?
View 9 Replies
Aug 30, 2011
I have an error with my Login.The Error show "the variable name '@Username' has already been declared.Variable names must be unique within a query batch or stored procedure.": this is my code..
[Code]...
View 11 Replies
May 15, 2006
I've developed program w/ VS 2005 .net 2.0.... the program works great on all my customers computers, except for one. Immediatedly whenever opening the program he recieves a clr20r3 error and the process terminates.
I compiled a version of the program that put a simple msgbox that displayed "I'm working right now" first thing in the sub that handles me.startup. The program doesn't even get that far. I've tryed repairing .net 2.0... and completely uninstalling 2.0 and reinstalling it.
View 13 Replies
Feb 25, 2009
I would like some code to execute at the "preload" stage of my usercontrol's lifecycle. However the preload event is only available on the Page object. So, I added the following method to my usercontrol:
Private Sub Page_PreLoad(ByVal sender As Object, ByVal e As System.EventArgs) Handles Page.PreLoad
However, I know get the compile error: "Handles clause requires a WithEvents variable defined in the containing type or one of its base types".
As the Page property is inherited from UserControl I don't see how this can easily be done.
View 3 Replies
Aug 31, 2010
I have 3 components, a managed .NET diagnostics app, which interfaces with a C++ multithreaded UDP socket messaging DLL, which sends messages to another C++ app.
Sometimes (especially on exiting the managed app) the messages are not getting properly handled by the destination app. The UDP socket DLL is sending everything fine, but they are not being handled on the recieving end. Now, if I put a messagebox in on the managed side, everything goes fine. Thinking it was just a delay thing with the popup, I've put thread sleep, regular sleep, timers, counting loops, etc. These "other" solutions do nothing, only the message box is making the messages be handled.
View 12 Replies
Dec 22, 2010
Since today VisualBasic 2010 express does not work any more: every time i try to run a project i got the following error:
InvalidOperationException was unhandled
Error creating the form. For details see
Exception.InnerException. Error: Exception thrown by a component outside.
[Code]...
View 3 Replies
Jan 29, 2009
I searched a few threads for TextBox number solution and found that most were using e.Handled and e.KeyChar in TextChanged. But I couldn't find them in VB 2008. What can I find in Vb 2008 for the same meaning?
View 7 Replies
Nov 16, 2009
I have a form, that acts like a drop-down, that I display non-modal. I attach a mouse hook to the form to determine when the mouse is clicked out of it, so that I know to close it - by setting Visible = False.
Because I want the HookProc to handle the last click, I can't dispose the Hook or my Dropdown until I'm sure that my event handler has returned to the HookProc.[code]...
View 2 Replies
Feb 6, 2010
I have an issue with usercontrols that has been puzzling me for a while. I think I must be overlooking something and many hours of web searching haven't resulted in increased insight.In my main program I have defined several events, that may be raised at certain times. e.g.: Public Event FlipBackgroundEvent As EventHandler
View 15 Replies
Nov 17, 2009
Private Sub TextBox4_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox4.KeyPress
If (e.KeyChar < "A" OrElse e.KeyChar > "Z") Then
e.Handled = True
End If
End Sub
If e.Handled = True means we can enter a to z and A to Z in textbox.If e.Handled = False then what it means??
View 1 Replies
Apr 2, 2011
I have an assembly containing a number of classes. This is a class library type assembly, not a windows forms application. It's also single threaded.Is there a way to catch all un-handled exceptions so that I can log them?
View 2 Replies
Feb 6, 2012
I'm working on a Form that contains a datagridview and textbox, I need the datagridview detect any letter of the alphabet or numbers, then select the input and send the key pressed to input.
View 1 Replies
Mar 16, 2009
I have used the Gridview_PageIndexChanging event in asp.net.i have used the code like this:
gridFileDetails.PageIndex = e.NewPageIndex
During the run time when i clicked the next page,it generates an error:
An exception of type 'System.InvalidCastException' occurred in FFK.DLL but was not handled in user
code
Additional information: Unable to cast
object of type
'System.Web.UI.WebControls.ContentPlaceHolder'
to type
'System.Web.UI.WebControls.GridViewRow'.
in the RowCommand event,I have used the following RowCommand event:
Protected Sub gridFileDetails_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles gridFileDetails.RowCommand
Dim row As GridViewRow = CType(CType(e.CommandSource, Control).NamingContainer, GridViewRow)
[code]....
View 3 Replies
Oct 2, 2010
I have a class library that uses the IApplicationAssociationRegistration Interface [URL]
Heres the code:
Class Library
IApplicationAssociationRegistration Class:
Imports System.Runtime.InteropServices
[code]....
View 1 Replies
Nov 17, 2010
I have a C++ method with this signature:
[Code]...
View 1 Replies
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]...
View 7 Replies
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.
View 2 Replies
Jul 20, 2010
I'm trying to validate a few things in a form I'm building. It has a datagrid with clients info (taken from an access database) and a few textboxes where the user can type some search criteria. The thing is that those same textboxes are used to add new clients to the database and to modify a client's information if one from the datagrid is selected, so I made it that the buttons to insert and modify clients are disabled on load and thenevery time the text on a textbox changes ("TextChanged" event) they become enabled. So far so good. But then I wanted to make it so when a client from the datagrid is selected both buttons become disabled again until the text on a textbox changes (to make sure they're adding a different client and not the same one that was
selected).
I tried using the CellClick event from the datagrid to disable the buttons, but since every time a client is selected from the datagrid the info is shown on the textboxes, this triggers the TextChanged event too, and the buttons become available.So, is there a way I can tell the TextChanged event not to be triggered when the CellClick event occurs?
View 3 Replies
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]....
View 2 Replies
