Custom Control - Signature Not Matching For Event

Sep 24, 2009

I'm using a third party grid control which I took and inherited to create some custom properties and events to it. Now when I tried to use this custom control on one of my forms one of the Events that I try to use keeps giving me an error and saying that the signature of the event does not match. It's only for this particular event and it doesn't give me the problem on every form I use this control on. To fix the problem, I constantly have to clean/rebuild the project with the custom grid control and then clean/build the project using the grid control. I'm using VS 2005 and the grid control I'm using is called iGrid.NET made by a company called 10Tec.

The exact error I get is below.
Method 'Private Sub iGridFlightInfo_BeforeCommitEdit(sender As Object, e As TenTec.Windows.iGridLib.iGBeforeCommitEditEventArgs)' cannot handle Event 'Public Event BeforeCommitEdit(sender As Object, e As TenTec.Windows.iGridLib.iGBeforeCommitEditEventArgs)' because they do not have the same signature.

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.net - Do Event Handlers Need To Exactly Match The Event Signature

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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Event Handlers Need To Exactly Match The Event Signature?

Feb 9, 2011

event handlers need to exactly match the event signature?

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I have a problem to handle an event on a custom control a have on a form.... So first i made a custom control that is just a groupbox with some labels and txtboxes. That control i add dynamically to my form like this (Baycontrol is the name of my control)

Declaration

Code:
Friend Bay(29) As BayControl
Add the controls to Form
Code:
For Simindex = 0 To 29 'Me.Bays - 1

[Code].....

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May 10, 2011

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Jul 19, 2009

I create several Labels using this code:

Dim L As New Label
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Me.Controls.Add(L)

I know how to do click events but how how do i make an event for it that does something when the mouse hovers over one of the Labels?for example if the mouse hovers over a label it changes text color to RED...when mouse leaves it changes back to BLACK?

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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
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[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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Public Class LgxLabel
Public Event LtxLabClick(ByVal sender As System.Object, ByVal e As System.EventArgs)

[Code].....

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I had this new idea for a user control Sliding Bar/Panel. See screenshot. So I quickly whipped it up but I've got this problem that I cannot figure out why it does not work. Because I wanted to make it nice and tidy I desided to use a Class (Header) and created a TypeConverter (HeaderConverter)

Code:
Public Class HeaderConverter : Inherits ExpandableObjectConverter
Protected SortOrder() As String
Public Sub New()
SortOrder = New String() {"Text", "Depth"}
End Sub
[Code] .....
and goes to the RaiseEvent but nothing happens Why?

I know I could put properties on the Container control to access the ctnbutton Control that is embedded into the control but I thought this might be a nicer way.

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By the way, I know that it would work by writing the code in the KeyPress of the form but that's not the requirement because the user control will be used as a standalone component for many projects.

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Feb 10, 2012

I have a user control (SomeUserControl), that I am using in a Main Window. I write my application entirely on SomeUserControl, and Main Window is hosting SomeUserControl and nothing else.

Right now I have a shutdown button (in SomeUserControl), that is supposed to close the Main Window. The reason for this is that I do not want anything from SomeUserControl to close the application itself, but to fire an event from SomeUserControl, and Main Window receives it, and Main Window will close the application instead of SomeUserControl.

How do I do it? I am not familiar with the concept of creating and handling custom events, so if someone could explain it in words and in code as an example, I will be very grateful to you!

Edit: Here's my code so far.

(in Window 2)

Public Event CloseApp As EventHandler
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[Code]....

I want to close the application when I click cancel in Window 2, but I don't want to do it in such a way that Window 2 closes itself, but by sending some notification to Main Window, and Main Window closes the application.

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Ie.

<cc:Button id="myButton" runat="server" Text="Submit" />
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Sub New()
InitializeComponent()
Enabled = False
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[Code] .....
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Private Sub MyButton1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyButton1.Click
End Sub

[code]....

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[Code]....

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(1) Should I consider using this for my own development work, which is 100% for internal purposes.

(2) Is this a concept that the framework designers could consider changing or updating?

I am thinking about using an event signature that utilizes a strong typed 'sender', instead of typing it as 'object', which is the current .NET design pattern. That is, instead of using a standard event signature that looks like this:

[Code]...

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Method 'Private Sub trigger_Triggered(sender As Object, e As OamsIDD.VoamsWorldIDD.OamsStateChangeEventArgs)' cannot handle event 'Public Event Triggered(sender As Object, e As OamsIDD.VoamsWorldIDD.OamsStateChangeEventArgs)' because

[code].....

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I need to show the signature on a report, so it would need to be an image I could link/embed into the report.

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I have created a custom control with an event called "valuechanged" When I try the following line to: AddHandler

ScheduleMain1.ValueChanged,
New
System.EventHandler(AddressOf[code]......

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[Code]....

'A call to PInvoke function 'WindowsApplication1!WindowsApplication1.Form1::GetAsyncKeyState' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.' The full code is in timer with (1) time interval

[Code]...

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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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<cc:CustomControl runat="server">
<Queries>
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[code]...

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Public Class customtextbox
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[Code]....

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Public Class Form1
Private Sub Form1_Activated(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Activated
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[code]....

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