i'm a .net programmer, using .net framework 4, and i have a question about WithEvents clause. [code] Private Sub mylist_AddingNew(ByVal sender As Object, ByVal e As AddingNewEventArgs) Handles mylist.AddingNew..i get this error: Handles clause requires a WithEvents variable defined in the containing type or one of its base types.I think the problem is my custom bindinglist class....but how can i solve this?
View 8 Replies
I get the error on this line on [ListBox1]
[code] Private Sub ListBox1_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) Handles ListBox1.SelectedIndexChanged
error
Quote:
Handles clause requires a WithEvents variable defined in the containing type or one of its base types.
I've just opened a project I was working on yesterday perfectly well only to find it's gone nuts. I'm getting this error ..."Handles clause requires a WithEvents variable defined in the containing type or one of its base types."... on each one of my Sub declarations!
View 2 RepliesI get the error
Handles clause requires a WithEvents variable defined in the containing type or one of its base types.
in the following code..
Public Sub selCurrentManuf_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) _
Handles selCurrentManuf.SelectedIndexChanged
End Sub
The drop list to go with it is the following...
<asp:DropDownList
OnSelectedIndexChanged="selCurrentManuf_SelectedIndexChanged"
selectedvalue='<%#Container.DataItem("c1_manufidcurrent")%>'
[code]....
I created a lable to handle DateTime = Now, It works fine. but when I moved it inside a FormView I Get the following Message. Handles clause requires a WithEvents variable defined in the containing type or one of its base types?
View 5 RepliesI am in the processing of moving an app from VB to C# but some of the classes I will just be moving to VB dlls to access from the main C# app. In doing this I am trying to get the VB dlls to utilize the main C# class lib. In this C# lib I have an abstract clase called base process, it sets up a background worker and handles all the progress tracking, errors, and even reports an ETA. To use this in a derived class in C# you would just do this...
public class SomeLongProcess : Common.Multithreading.BaseProcess
{
public void start()
[code]....
The problem is that if I do the equivelant in VB I get an error "Handles clause requires a WithEvents variable defined in the containing type of one of its base types". Well I can't do a WithEvents in the base class because it is C# so..
I am trying to follow this thread
[URL]
and I have it pretty close but have one error.
Quote:Handles clause requires a WithEvents variable defined in the containing type or one of its base types.
That error is on both of these, in blue
Private Sub SpellChecker1_DeletedWord(ByVal sender As Object, ByVal e As NetSpell.SpellChecker.SpellingEventArgs) Handles SpellChecker1.DeletedWord
'save existing selecting
[code]....
I have added the reference, I have also added them to the toolbox. My dictionary is all set. What did I miss?
i am getting errors on last two event handlers. what did i do wrong?
Error - Handles clause requires a WithEvents variable defined in the containing type or one of its base types.D:Shipping ApplicationShipping ApplicationForm1.vb75136Shipping Application
Error - 'PrintDocument1' is not declared. It may be inaccessible due to its protection level.D:Shipping ApplicationShipping ApplicationForm1.vb1119Shipping Application
[code]....
Just upgraded a VS 2005 ASP.NET 2.0 website to VS 2008 ASP.NET 3.5. There was an error on the Sub Button_Click. It seemed to be a minor error, the website and the button worked just fine, as usual. What does the error mean?
Protected Sub btnDEreports_Click(ByVal
sender As
[code]...
Error 20 Handles clause requires a WithEvents variable defined in the containing type or one of its base types.
My coding, I got error: Error Handles clause requires a WithEvents variable defined in the containing type or one of its base types.
For information i am using visual studio 2005. Here i highlight my probleam with in my coding
Public Class Admin
Private Sub TextBox6_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)
End Sub
[CODE]...
When I attempt to run a program I just finished coding I get the following message: "Error 1 Handles clause requires a WithEvents variable defined in the containing type or one of its base types." Looked it up online and still does not make sense to me. If I need to paste code or anything else let me know and I will do so ASAP.
View 8 Replieswhen i am selecting form the xaml file a button and then tap event from the right (in order to set the tap event) it auto generates this sub :
[Code]....
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Click, Open.Click,Name.Click
SelectVid.ShowDialog()
End Sub
[code]....
I keep getting this error:
Error1'.' expected.
Error2Handles clause requires a WithEvents variable defined in the containing type or one of its base types.
Error 2 is also error 3
I am auto generating data grid and I am using check box in Data grid View,Now i am invoking check box state changed event but it produces the following error Handles clause requires a With Events variable defined in the containing type or one of its base types.
Here the code
Private Sub PRNT_CheckedChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles PRNT.CheckedChanged
Some Stuff.
End Sub
Is WithEvents & Handles usage preferable to RemoveHandler & AddHandler?
From Memory point of view (remove an added handler after utilization, etc.)
listbox control (lst_tpAccount_AvailableAccounts) has an event handler:
Private Sub lst_tpAccount_AvailableAccounts_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles lst_tpAccount_AvailableAccounts.SelectedIndexChanged
[code].....
Is there a way to simply the Handles statement? What if i want this sub to handle 20 textboxes do I have to list each textbox there? I already have a loop in my script so i can cycle through my textboxes ("TextBox" & i.text). is there anyway to use a variable or a function after handles to get all the names of the text boxes?
Private Sub textChange(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress,TextBox2.KeyPress, TextBox3.KeyPress, TextBox4.KeyPress, TextBox5.KeyPress
i have the folowing co
For x = 0 To 7 Step 1
For i = 0 To 7 Step 1
Dim rectangleShape1 As New Microsoft.VisualBasic.PowerPacks.RectangleShape() 'create a new object to assign to the array location
board(x, i) = New Microsoft.VisualBasic.PowerPacks.RectangleShape() 'create the new object in the array
[code].....
Does anyone know why a local variable cannot be declared WithEvents?T
View 3 RepliesIn a Visual Basic .NET application, is there a way to use Handles on an object referenced in a DLL written in C#? Compiling the code gives me the error: 'Handles' in modules must specify a 'WithEvents' variable qualified with a single identifier.
I'm writing the Visual Basic .NET application, but I do have the source code of the C# library available.
My current code looks something like this:
WithEvents Friend Module As ModuleNamespace.Module
Sub EventHandler() Handles Module.Events.Event1
Console.WriteLine("Event1 fired.")
End Sub
Replacing Module, ModuleNamespace, and Event1 with the actual names.
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
[CODE]...
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.
I've got a TEXTBOX called CompanyName. And I've got a warning in the error tab that says:
WithEvents variable 'CompanyName' conflicts with property 'CompanyName' in the base class 'Control' and should be declared 'Shadows'.
Is CompanyName some kind of reserved keyword? I'm getting the same error for a textbox called Location. Can I ignore these warnings or must I rename my textboxes. My problem is the textboxes are named to match columns in a DB TABLE to allow me to do some auto-binding logic.
I'm getting the following error:"Incorrect syntax near 'Sysco' " when running the following statement using SqlDataAdapter:[code]
View 2 RepliesI am using VS2010 windows application , SQL server 2008 express at backend.I am designing a windows form with fields to search records in database.Say there are 3 fields in the form :
1) material no 2) material group 3)creation date the corressponding table in database with above fields is " Material_master" User can search materials in the database by entering any of the above fields.No I want to write a query where if user doesn't enter anything then my query should work like
"select * from materialmaster "
if only material no is enterd at screen then
"select * from materialmaster where MatNo = materialno "
if both date of creation and material no enterd then
" select * from materialmaster where MatNo = materialno and Date = creationdate "
In other words , field with no values in it should not be accounted in the where clause. Only one query I want to write.How we can achieve this in VB.net windows application?
I am converting an application from vb.net 2003 to 2005. I got the following warning and need help how to resolve it. withEvents variable 'PreviousPage' conflicts with property 'PreviousPage' in the base class 'Page' and should be declared 'Shadows'
View 1 RepliesWhat does this error mean? I havent modified anything in the designer code, but its giving me an error? WithEvents variable 'Move' conflicts with event 'Move' in the base class 'Control' and should be declared 'Shadows'. The error relates to Friend WithEvents Move As System.Windows.Forms.DataGridViewCheckBoxColumn
View 1 RepliesWho knows, why in vb.net WinForm projects the designer by default use the Friend WithEvents attributes and in C# - private ones.
By ex, in a form.designer.
.cs
private Label Label1;
.vb
Friend WithEvents Label1 as Label;
For WithEvents is more or less clear(for using Handles, apparently). But why Friend in VB and private in C#...
When you declare an object 'WithEvents' and then utilize the "Handles" clause at the end of your event methods, how does Visual Basic manage a reference change for the object? In other words, if the withevents var is set to ObjectA, then later I switch it to ObjectB (or nothing), does Visual Basic automatically both remove those handler methods from ObjectA, and attach them to ObjectB? Or do I still have a ObjectA's events being handled behind the scenes?
I ask this because if instead you use AddHandler for an object, and then switch your reference, unless you removed the handler before switching, your original object is still handled (at least I'm pretty sure that's how it works).
I have the following classes: Public Class Email
[Code]...
If a create a wrong email lets say "email" the exception is correctly cached and a message is showed however is i input a valid email the event is not raised, the object is being created but no message is shown and no error or exception is thrown i suspect it has something to do with using "myemail = new Email(email)" but i have seen examples of using new with withevents with no problem.
I'm trying to create multiple instances of a child form. This form has an event that feeds a string variable back to the parent so I'm declaring it with WithEvents which is declared outside of the Sub - meaning multiple clicks will not open multiple forms.
another method of doing this while keeping the event?:
Dim WithEvents FRestoreDB As New FormRestoreDB()
Private Sub BtnOpenDB_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnOpenDB.Click
[Code].....
