Add A Handler To A Publicly Created Object?
Feb 22, 2012
I'm adding some functionality to an app that was made a few years ago and I need to raise an event when the tabcontrol is clicked. However it would seem because the control was created publicy I can't add a handler to it? I never ran across this before. I stripped the code down to the bare essentials. As you can see in the image, if I Dim the control within the sub I can add the handler. But any handler created for the publicly created control fails.
Is there another way to create the hander in this case?
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Sep 3, 2011
Say I have an object that I dynamically create. For example, say I create a button called "MyButton":
[Code]...
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Oct 5, 2009
If you want a instance of an object to be created when a form loads or another class is created, you have two options:
Public class example
private IAmAObject As IAmAObject
public sub new()
[CODE]...
Or like this:
public class example
private IAmAObject as new IAmAObject
public sub new()
[CODE]...
I always use the first one. It's more type work but I think it's neater. How about you people and is there any real difference between the two?
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Jul 21, 2009
I have a text file filled with the locations of pictures and I have this code to dynamicly create picture boxes on my form, the code works because it does create one picture box but no more than that, my question is what do I have to do to this code to get all the picture boxes created?
CODE:
Also How would I dynamicly add a Handler for every Picture box created?
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Mar 4, 2010
Here is the code for the button click event;
Protected Sub CompetenciesButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles CompetenciesButton.Click
Dim con As String = WebConfigurationManager.ConnectionStrings("foo").ToString()
[code].....
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Mar 4, 2012
I would like to ask a question with DataGridView event handling.The event I am going to handle is the double-clicking of a cell in a DataGridView:If the DataGridView's are statically drawn on the form at design time, then it is easy to assign to each of them an even handler by double clicking the corresponding event in the properties panel.
Private
SubDataGridView1_CellDoubleClick(sender
AsSystem.Object,
[code]....
So basically I have handle to all of the DataGridView's. Is there a way to create a common event handler on this basis?
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Jan 24, 2012
I am passing some values from a Gridview Update Click event to a popup ASP.net page that dynamically builds a series of textboxes in a Placeholder based on the number of sentences that are found in a specific cell of the Grid Row selected.The boxes that are built represent each sentence found in the cell of the selected row. Each sentence is presented for translation, where user enters data into a 2nd dynamically generated textbox.This all works great.Now I have a Listbox beside the 2nd textbox, which sometimes has 1 or more variables that need to placed into the translated sentence. I have set up a Hover menu over the listbox so that I can select the variable and insert it at the end of the sentence in the 2nd textbox. My problem is generating the click event on the dynamically created Listbox. Something like....
Protected Sub ListBox1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged
TextBox1.Text = TextBox1.Text & ListBox1.SelectedValue
[code]....
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Sep 14, 2011
I have to create controls for inputting info to create people objects in the program, because I don't know how many people they are going to input, I have a button that they can press to add more fields.
I need to add a doubleclick event for these dynamic controls (text boxes), how can I create an event for them if they haven't been created yet. Also, as far as I know you cant make a variable part of an object name while declaring it. I need to do something like
Dim dynamicText & (Append variable counter each time a box is made)As New TextBox
dynamicText &variable counter. Name = "TimeTextBox"
dynamicText.Text = "SdgsdG"
dynamicText.Location = New System.Drawing.Point(100, 100)
[code].....
Also is there a way to like copy and paste a group of controls via code instead of having to code each individual one like if I had to do a text box along with a combo box and a lable all at once, can I throw it into something so I only have to recreate the container?
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Mar 24, 2011
In the following code I open several Excel workbooks from within the VS 2010 .IDE. I want to Try the open workbook code, then Catch exceptions using a dialogbox as a form created programmatically at run-time. The exception handler works, but the dialog box does not display in front of the workbook. So, the user can't respond to the modal form. If at that point the Excel workbook is shrunk manually to expose the dialogBox which is then dismissed, Excel pops up a "Save Changes?" alert and the VB code does not resume the Sub at the Me.Focus() line
When the workbook Is open Excel is the active application. I think this is why the dialog box is not in front, and I don't know how to solve the problem programmatically.[code]...
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May 12, 2011
I have a Winform application where i added picturebox's to a flowlayout panel dynamically from code. I have successfully managed to add a handler for doubleclick and click events the problem i have is that when i add both together it only seems to work with the click event and not the double click. where I could bee going wrong? Iam using VS2008 .NET 3.5 my code looks a bit like this :
Public Class Class1
Dim WithEvents picturebox1 As PictureBox
Private Sub Brochure_Creator_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[Code].....
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Sep 15, 2009
Ok this is probably the most basic question that you ever saw. How to declare value publicly (globally).
I want to declare time = 0
And I want my timer sub to know what time equals to How can I do this?
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Nov 11, 2010
I hope the question makes sense, anyways. I'm looking to know if in VB.NET, when we call an object's constructor, is there some kind of a reference that points back to the caller? I'm interested because of a corner case where I want the object being created to first be able to validate the existence of some data in the caller before it allows itself to be created. If this validation fails, I plan on throwing an exception. This corner case will never happen at runtime unless the object being created is used improperly by a programmer. The object being created is not inheriting the object I want it to validate, so I can't do anything with the MyBase qualifier.
It's bit of a "future-proofing" issue that I have a (bad) habit of doing. Not critical -- I can always leave stern comments behind as a last resort. Wanted to know if this was possible.
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Dec 19, 2011
I am trying to create a Sub that can take an object and add a load of event handlers for it, but the object can be any one of N types that all have these events. How can I do this? If I just have it as an Object as below AddHandler complains that the event does not exist for Object.
[Code]...
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Oct 11, 2010
I created an Access Object in vb.net:Dim acApp As Object = CreateObject("Access.Application.11")en I open Access I need to pass a parameter to it though "/cmd".I read that the only way to accomplish this is through a shell - that it is not possible directly using an Access object.
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Aug 12, 2011
I need to call this function saveBase from more than one place so i decided to send a number in variable x to know of what type to create the object named Model. however when it's within the if statemet i keep getting the error that model is not declared ![code]...
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Apr 12, 2011
I have a dll that create container object. How can dll inform a form that the container (me) has been created. Is it possible in new sub of that class?
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Dec 10, 2010
My
Public Class Form1
Dim x As Integer = 0
[Code]....
As you can see, i can retrieve the tag of the button (which is created at runtime) without any problems, i've made a temporary msgbox to show me the value of the tag, just for testing purposes. What i do have a problem with, is retrieving the tag of the individual web browsers, how should i do this?
Next issue, how would i code for my buttons to show the web browser with the same tag as the button that's just been clicked?
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Apr 3, 2010
I need to save a object that i programing to be drawed onto apictureboxPictureBox1.CreateGraphics().FillEllipse(Brushes.Blue, ci)how do i save the object as a image or the picturebox? And then be able to open it again?
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Nov 1, 2010
I have written some code to generate 10*10 textboxes during run-time.the problem is; I don't know how to access / change them after they are created. after some googling, I found this code to show the text of ie box42;
MessageBox.Show(Me.Controls.Item("box42").Text)
but it gives an error (nullreference exception was unhandled) hereby the code;
For i = 1 To 10
For j = 1 To 10
Dim tb As New TextBox
tb.Name = String.Format("box{0}{0}", i.ToString, j.ToString)
[code]....
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Aug 11, 2011
I want to make a lotto bulletin and i created the buttons in the program. I have assigned a handler to it and that is working also but how can i change the background of this button later on in the program ?
'/ teken 10 groupboxen
For i = 0 To 1
For y = 0 To 5
[Code]....
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Jun 6, 2011
I have a scanned document in my system. It's a tiff file. You will see below the code i have written. The problem is that i get an error message. The message is like this "A Graphics object cannot be created from an image that has an indexed pixel format." [Code]
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Nov 3, 2009
how would I create an event procedure for something not yet on a form?
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Aug 9, 2009
Not sure exactly what I need to do to make this work, so my description may be lacking at first.Essentially I am writing a program launcher that recreates itself each time on load. It pulls the data regarding the tabs and buttons from an SQLite database and builds itself dynamically at run time. I get my problem when I pass the tab name through to the function that creates the buttons. I need the name to pull the right set of buttons from the database and I then tried to use the name to place the buttons on the right tab when I create them, but the debugger calls it a null reference because it doesn't point correctly to the tabpage that I'm trying to make it point to (at least that is what I'm guessing). Any ideas on how to make this work right?
[Code]...
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Apr 24, 2009
how do i change the property of a created object in the timer event? In other words i have a button that creates a panel for me, in a time event i want to change the created panels to a different backcolor, how would i do this?
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Feb 3, 2012
Below is some code that I'm using to create objects with Visual Basic:
For indexCounter As Integer = 1 To TotalParticipants Step 1
participantClock = New Label
participantClock.Size = New Size(100, 20)
participantClock.Name = "participantClock" & indexCounter
[code]....
I'm creating a label, a button, Timer, and Stopwatch. (Though I have sinking feeling I don't need BOTH a timer and stopwatch since I'm counting time.)What I would like to do, is create the label and set that label's text to be the value from the stopwatch. The button that will be created will stop THAT stopwatch.
The problem that I'm having is that I cannot call the stopwatch by name since it wasn't created yet and VB throws a hissy fit at me for it. (After all it wasn't really declared.)So the question becomes, how do you call the most recently dynamically created control and assign events using that control. If it's not possible to do, I do not mind dumping the form and starting over creating 30 stopwatches instead (but I'd like to avoid that, if possible).
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Feb 17, 2011
I'm creating a textbox at runtime, which works fine, but now I need it to have a selection_change. How do I do that?
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Jun 8, 2009
I am trying to create a function that will return a pen(System.Drawing.Pen to be exact) that will have a random color and width. I thought that something like this should do the trick:
Public Function random_pen() As Pen
Dim clr As Color = Color.FromArgb(255, random_rgb_color_gen, random_rgb_color_gen, random_rgb_color_gen)
Dim pn As Pen = Pens.PeachPuff 'just a random color else i get a null exception...
pn.Color = clr ' the error is here
[Code].....
However when the code is run i get an Argument Exception with the error message:"System.ArgumentException was unhandled Message="Changes cannot be made to Pen because permissions are not valid.""
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Jul 26, 2011
I have an editor created invb.net that creates html files. And when i click the button run , the Internet Explorer opens my file that is inside the Richtextbox.
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Aug 27, 2011
How do I get a Event Handler to fire from within a nother Event Handler?
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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]....
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