Two Objects That Are Raising Some Events - Pressing A Button - Raise A Custom Event, Then Execute A Method And Then Close The Form
Mar 30, 2011
Problem that you may have when dealing with two objects that are raising some events. Here, to make it obvious, I am closing the form, but the problem can be experienced with any other 2 classes event. First, what is the problem !
Let suppose that by pressing a button, you want to raise a custom event, then execute a method and then close the form
In that case, you may use a code similar to this
Event BeepIt()
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
RaiseEvent BeepIt()
[CODE]...
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May 1, 2009
long story short, I have created a ListView type control, using UserControls for the parent control and the ListViewItems. Most the of the control is written and works fine, right up to the point where I tried to replicate the 'Control.SelectedItems(0).Index' property and the 'SelectedIndexChanged' event.
Each child object knows its index value, and could pass this value via the SelectedIndexChanged event (assuming this is how it works in a normal ListView control -- user clicks on an item, and that item fires an event updating the selected index value in the parent object).
How does the child object raise an event in the parent object? I have a feeling this could be done with Delegates, but I'm still learning about their usage.
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Sep 29, 2010
How can I close the form by pressing the scape button? I know I can put a button on form and set the form CancelButton to this button, but is there another way without placing that button?
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Mar 15, 2009
I have a windows applications. Form 2 is child form of Form1 . Basically when button on form2 (child form) is clicked, it raise an events, which writes something in testbox on form1 (parent form). This is my code
parent form form1
Public Class Form1
Public mycount As Integer
[CODE]..............
This is the first time I am tring to use events.. I am not sure what's going wrong.. the textfill event is never called from form1.
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Dec 8, 2009
I'm writing a custom textblock control thats populate hyperlinks and raises event when clicked to hyperlink.
I wrote this code but I got stucked.
My code is :
Imports System.Text.RegularExpressions
Public Class CustomTextBlock
Inherits TextBlock
[Code]....
This code gives error at RaiseEvent Klik(sender, EventArgs.Empty)
Error is : Cannot refer to an instance member of a class from within a shared method or shared member initializer without an expliticit instance of the class.
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Apr 27, 2011
I am attempting to test that the event handlers between an interface and controller are wired properly. The system is set up like the example below:
[Code]...
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Jul 1, 2010
How to raise combobox_SelectedIndexChanged(object sender, EventArgs e) programmatically? Lets say i have method called ClearFields(). I want to call the event before i hit the end of Clearfields() method.
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Sep 16, 2009
may i know how to implement a delegate method into my project> currently i am using the serial port polling method by using a timer to read from the serial port, but now i am changing the method to delegate part.i have the code for the delegate part updating to the text box control but how do i modify it to update the mainform with my program codes.
The part for the delegate code is here
'---Event handler for the DataReceived event---
Private Sub DataReceived( _
ByVal sender As Object, _
ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) _
[code]....
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Nov 14, 2011
I have a Windows Service project designed to monitor an email account and make entries into a SQL Server database when certain emails arrive. This is a rewrite of a similar winforms program that works just fine, except that it requires that the computer be logged into an account and the program started manually, which I can avoid by using it as a service.In the service I maintain a list of logged messages - basically just a string and a timestamp indicating that something has happened. (That list is shared out over a WCF service but I think that's immaterial, at least at the moment.) In my custom class I declare a public event, and elsewhere I raise that event. For some reason, though, the RaiseEvent isn't being run in the service. For example:
[code]...
The problem in this case is that _pc_HandleEvent isn't ever being called. If I duplicate this setup in a regular winform program, everything works like it should. What am I doing wrong? How do I get a service to handle events raised from other classes?
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Feb 18, 2011
When i use my UserControl in a project my Mouse Enter & Leave events aren't firing, i assume i fix this with a raiseevents in my usercontrol. However when i try to do this it says something about "cannot raise base event from derived class".
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Jan 25, 2010
i've a app that starts from a sub in a module, do a few things, and then load the form.
But it doesn't work :/
Here we execute dBase.AddTemporalFilepath
module.vb
Public dBase As New Core.clsDatabase
Public Sub Main()
FurBase.Directory = My.Application.Info.DirectoryPath
[Code].....
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Jun 21, 2012
Ok, so I'm writing a basic windows form application in VB.net as you do and need to be able to raise keyboard events based on data received from the serial port. I'm able to receive the characters that I want (lets say a lower case c) and display them. Its also easy enough for me to find the keycode. What I want to do though is tell windows that key "c" has been pressed. The application is paired to a bluetooth terminal, I wanted to have the experience of writing the code behind this myself rather than using another library although it seems I've failed already. How would I go about doing this?
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Dec 15, 2010
How can I raise an event within a button code?
If possible i would put the keydown event inside the button code,.Or other ways to make a button trigger the keydown event...?,
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Apr 19, 2012
The MyBase.Shown event only gets raised the first time a form gets shown. How do I make something happen every time the form is shown?
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Jan 23, 2012
How to catch the event of the window close button(red X button on window right top corner) in wpf form ? We have got the closing event, window unloaded event also, but we want to show a pop up if he clicks the close button of the wpf form.
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Jun 12, 2011
i guess the title pretty much states the question but i will give the senario to be more clear. i have a mousemove() event which i add in my program programmatically and i need a way for raising that event (again) programmatically too. raiseEvent control_mousemove() doesn't work as it says that "'control_MouseDown' is not an event of 'main'."
[Code]...
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Feb 22, 2010
I have this code that tries to kill the wampmanager process when the user press on a buttonBut how can I achieve the same thing if the user clicks on the close button. Is it possible to execute a small line of code just when the user clicks on the close button?If you know any alternatives in
Dim pProcess() As Process = System.Diagnostics.Process.GetProcessesByName("wampmanager")
For Each p As Process In pProcess
p.Kill()
[code]....
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Nov 12, 2011
i've an owned form that never raise the paint event, and so i can't make it rounded...
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Nov 11, 2011
during the development of my project, i've the need to raise the paint event of a form, to make it with rounded angle.The strange thing is that, when i use the invalidate comand on it, the repaint event (that sometimes doesn't go and i don't know why), doesn't make it like i need, that is, the dimension of the side is one instead of six pixel, and the angle are rounded, but the border is not visible.
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Aug 17, 2010
I'm instantiating an instance of FormQuoteCard from formQuoteList, formQuoteCard has an event and I'm adding an event handler to form1, but when i raise the event in form2, nothing happens:
[Code]...
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Nov 16, 2010
I have a UserControl, we'll call it myUC, that is one among several UserControls in the main window(myWindow) of my WPF application. myUC contains a number of standard controls, one of them being a button, we'll call it myButton.
When I click myButton, I would like to execute myMethod, which exists in the code-behind of myWindow.
The problem being that myUC doesn't have any idea that myWindow even exists, much less that myMethod exists.
How can I send the message: 'Hey, myWindow, wake up. myButton on myUc was just clicked; run myMethod'?
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Jul 22, 2009
I have a windows application which raises a particular event.I need to create a COM callable class whic will allow VB 6.0 to subscribe to this event.I have done a fair amount of research on this and am confused as hell.
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Apr 24, 2011
Project1 builds ShellControl.dll.One of the forms in Project 1 contains the event "Public Event CommandEntered As EventCommandEntered".
Project 2 builds the Windows Form application TestApp which use ShellCopntrol.dll built by Project1.Form1 in Project 2 contains the following statements:
Imports ShellControl.UILibrary.ShellControl
[code]......
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Jul 13, 2009
I have two forms, "Customer Information Summary" and "Products Sold". They are shown as separate tabs in a MDI window. When the data in "Products Sold" gets updated, I would like an event to fire from that form which could be handled in the "Customer Information Summary" form.
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Aug 3, 2009
Im in need of help so i can make my app close when I press the X wich are integrated in my background screen(made in photoshop). Ive tryed to add a button there and set Visible=false [code]...
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Aug 15, 2011
can I call shared events contained in one class from another class?
for example:
logonclass.vb : handles login logic and authenticates against database
logonmanager.vb: hold current user reference and some logon and timeout events
Logon.vb: A form with a submit button.
I would like to do something like this but I can't get the compiler to agree with it
If VerifyEntries() Then
Try
privLvl = LoginClass.AttemptLogin(txtUserName.Text, txtPassword.Text)[code].....
If this isn't the proper way to wire things together let me know so I can learn to structure differently. In my planning it seemed like I was raising a lot of extra duplicate events from my logonclass to my loginmanager class. Then the loginmanager had to raise it again for the main form to see the change event. It got me thinking that if I publicly shared the events and could raise them from wherever then it would cut down on the amount of events I needed in code and the amount of them flying around at runtime.
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Dec 27, 2010
I am currently trying to make a calendar project it has 2 user controls one is the calendar and the other is the calender day control. When the month changes in the calender control I need to raise an event in daycontrol to update any holidays. In the calendar control I have the following code for the event:
Friend Event MonthChanged()
Public Sub New()
' This call is required by the Windows Form Designer.
[Code].....
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Jul 14, 2011
I want to have a collection of a class which inherits picturebox, with a couple of extra properties, so essentially the same. Only I get an error at runtime saying : 'An error occurred creating the form. See Exception.InnerException for details. The error is: Object reference not set to an instance of an object.' Here Is my code, I know that the error occurs here :
[Code]...
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Jul 26, 2010
I have a TAPI program that is very similar to [URL] I have a delegate ...
Delegate
Sub TapiEventCallback(ByVal
dwMessage As TapiEvent,
ByVal dwParam1
[code].....
From my program TAPI will call the number. My problem is that its not raising any events. I really need CallStateChange. I raised it from address and moved it up to my TAPI Manager. I put break points everywhere and I can not get anything to raise.
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Jun 29, 2010
The type for variable 'cri' will not be inferred because it is bound to a field in an enclosing scope. Either change the name of 'cri', of use the fully qualified name (for example, 'Me.cri' or 'MyBase.cri')I have created a class file with name Predefined which consists of this methods like cricket,BasketBall from this methos im returning List of string typeim calling that class in button click i As Integer = 0 To cric.Count - 1
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