Shadowing The Text Property?
Dec 4, 2011
It works, but doesn't save what I've changed it to. In the designer everything works fine. I can change the text and have it update on my button control. BUT once I run or rebuild in any way, the text property changes back to it's default value, in my case "Button Control"These are what I've tried, and I've tried all with both Shadows and Overrides - both with identical outcomes. So I've just indicated that with Shadows/Overrides.
vbnet
<DefaultValue("Button Control"), Browsable(True)> _ Public Shadows/Overrides Property Text As String Get Return MyBase.Text End Get Set(ByVal value As String) MyBase.Text = value Me.Invalidate() End Set End Property Private _Text As String = "Button Control" <DefaultValue("Button
[code]....
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Sep 8, 2009
In VB.NET there is a keyword 'shadows'. Let's say I have a base class called 'Jedi' and a derived class called 'Yoda' which inherits from 'Jedi'. If I declare a method in 'Jedi' called 'ForcePush' and shadow that out in 'Yoda' then when calling the method on an instance of the 'Yoda' class, it will ignore the base class implementation and use the derived class' implementation. However if I have an instance of 'Yoda' that was declared originally as of type 'Jedi', i.e. Dim j as Jedi = new Yoda(), and called the 'ForcePush' method on the instance, it will use the Jedi implementation.
Now let's say I have an event that is called 'UsingForce' which is raised when the 'ForcePush' method is called, and I shadow the event out in the derived class (this is because 'Yoda' has an interface 'IForcePowers' that declares this event) and each class raises it's respective event.
If I have an instance of 'Yoda' that is declared as type 'Jedi' (like above) and I put an event handler on the 'UsingForce' event of 'Jedi', and then the 'ForcePush' method is called in the 'Yoda' class, will this event handler be reached?
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May 4, 2011
I have a two windows forms classes, a base class and a derived class. The base class has an event handler which handles ValueChanged on some component. I have also written a different event handler for the same event on the derived class.
When I create an instance of the derived class and fire the event, I find that both event handlers run (the base class one and then the derived class one). But I want only the handler in the derived class to run.
Edit: Here is what the code looks like (can't post the actual code):
Public Class BaseForm
Inherits System.Windows.Forms.UserControl
(Windows Form Designer Generated Code)
[Code].....
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May 8, 2009
shadowing and delegate method?
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Nov 17, 2009
I have a couple of small classes to represent parts in a search filter. If the searched value equals NonValue the filter is supposed to do nothing. This is defined in a Base Class:
Private Class BaseFilter
Protected NonValue As Object
Protected sQueryStringBase As String = "AND {0} {1} {2} "[code]......
When I then create a StringFilter and check for allowed value:
Dim stf As New StringFilter()
stf.CheckNonValue(MyString)
I get a NullReferenceException (NonValue = Nothing) , when I expected the NonValue object to be String.Empty. Is this a bug in my code, or am I trying to achieve polymorphism in a wrong way?
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Mar 4, 2010
I'm in a project where it's pretty much my first time doing all the architecture myself,and I'm running into a frustrating situation. My architecture for forms seems to be correct from a heuristic perspective, but I don't think its implementation is correct.
My architecture is thus:
Base Class: OrderForm
Child Classes: PurchaseOrder, Invoice, Credit
[code].....
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May 13, 2011
I have created a new usercontrol. My usercontrol contains several other controls like labels, buttons and so on ...When I set the Font property of the usercontrol I want that font property value to propagate down to the child controls.
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Apr 4, 2011
Shadows vs. Overrides in VB.Net.What's the difference between shadowing a function in a base class in a subclass and overriding the same function? There is performance issues involved too?I know how to shadow and how to override in VB.net. My question is about when and why should I shadow a function instead override it and vice-versa.
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Aug 3, 2010
I have a dataview an i would like to show the count property in a text box.
i tryied the following
me.textbox1.DataBindings.add(new DataBindind("Text",DataView,"Count"))
But i have a exception.
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Nov 18, 2009
I want to type the characters from right to left (to behave as a right alignment). But I am not supposed to use the Right Alignment property or the RighttoLeft property of a text box.For example, I want to enter the characters of a string from right and each character should shift one space left so that the user can enter another character after that.
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Jun 16, 2011
Private Sub Button1_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim TextBoxContents As String
TextBoxContents = Button1.Text
TextBoxContents = Button1.Text
End Sub
End Class
[URL]when I debug it I press Button1 the text property I assigned to it doesn't appear in the text box.
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Dec 9, 2011
I'm having some very weird issues with interfaces right now.
I have a very simple setup. In one of my class, I have a Property implementing a Property from an Interface.
In my class it's like:
Private _oForm As IForm
Public Property Form As IForm Implements IContainer.Form
Set(value As IForm)
[Code]...
I have like dozens of interfaces like this working throughout my project and I can't believe this simple one can't work!
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Oct 27, 2009
Is it possible to put RTF text in a control's tag property?
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May 21, 2010
I have a control with a inner TextBox. I want to make a direct relationship between the Text property of the UserControl and the Text property of the TextBox. The first thing I realized is that Text was not being displayed in the Properties of the UserControl. Then I added the Browsable(true) attribute.
[Browsable(true)]
public override string Text
{
[code].....
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May 26, 2010
I am trying to create a new customised textbox using vb.net 2005 usercontrol. And also am new to .NETWhen i add the property Text() it does not shown in design modeThe user control code is like :
Property Text() As String
Get
Return MyText.Text
[code]....
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Jun 13, 2010
I have Visual basic 2008 express and I have the next code:
[Code]...
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Jun 21, 2010
I have a dropdownlistbox in a webform. When the page loads, it displays the initial text, that is ok. When selection is made, it works ok. But when i tried using the text property ie msgbox(cbomodel.text), what shows in the previous text. The newly selected item is never recognized. Is there a way to bind the text to the listbox after a selection is made?
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Nov 15, 2011
I have a list view with Two Columns. I want to set text in the Column Header as "Bold" & Text Align as "Center". But the text in the rows of the list view not required bold & center.
So, How to control them independently...?
Question II:
How to modify the Height of the rows...?
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May 1, 2009
Is it possible to read a label's text property of another app? I know how to get the handle of the main window, and how to get the handle for a child. But the problem is that there's like 20 other labels on the window and when I use winID to get it's class, it's just "Edit", and it's the same for all the labels. And the title is the value of the labels text property. [URL]
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Feb 2, 2009
I had read on pages like this
that when adding objects to a CheckedListBox, it takes the .ToString() function of each added object as the text string.
I added instances of SortedDictionary as this[code]...
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Apr 19, 2010
I have a windows form which contains a textbox.I have a loop in my code doing some farly intensive work. In the middle of the loop I want to update my text box.text property on the form to let my users see some simple progress.
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Jul 10, 2009
i want to use a text box of format shown below:Attachment 71883means the text box will at its end show what the user will input in it as you can see the above text boxes in the figure
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Feb 13, 2010
How do I transfer the value of a variable and place it into the text property of an object on form load?
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Oct 6, 2011
I'm trying to write a Database manager in VB (2010) that updates a SQL database that compiles and summarizes my financial records. The code works, but I'm having issues with one exception that I think I understand, but can't circumvent. I've built an I/O form that enters a series of purchases and sales into a temporary datatable. After review of the list, the program connects to the database and executes the SQL. That all works and isn't a problem.
[Code]...
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Mar 4, 2012
how would i go about changing the text property of a button when clicked. Im using panels to switch between what the form shows but when i click the button to switch panels i want the text of the button to change but i cant figure out what property to change and how to go about doing it.
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Apr 20, 2011
I have been searching for an easier way to validate the text property of my combobox.
Below is a background of what I am try to accomplish:
I have a from that contains many controls, mainly comboboxes that are bound to datatables. I have these set up in such a fashion as to when the user begins to type, the values begin to show and auto populate the combobox. This makes the selection process easier to select an actual value in the list. But, as we all know, you can lead a horse to water but you can't make him drink. Users still have the ability to type something that is not in the list. I do not want to allow them to leave the combobox until the have selected or typed a valid value from the list because I am building a SQL query to retrieve data for a later form. I don't want to lose the above mentioned functionality of being able to type it in. I currently have it working as follows, but there must be a more elegant way to do this.
I first populate my combo box like so:
CODE:
The part I don't like the most is that I feel like I should be able to use the list already loaded in the combobox data, but I can't figure out how to do it. So I end up having to reload it, this seem like a waste of time.
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Dec 30, 2010
Well, the question says it all. I have tried the _.SelectedItems(0) method, but it is not working at all. It only works for the first item, but for all others it says that "0" is not a permissible index value, or something like that.NOTE: All of my items are constant, as in they will not change. None will be added, and none will be removed.
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Apr 9, 2009
I have a vb2008 combo box with the DropDownStyle property set to DropDownList.Now, when I set the text property to something programatically nothing happens. That is, the "something" doesn't show up on the control with list collapsed. It still doesn't show even if I force an update(If DropDownStyle property is set to DropDown, setting the text property programatically works fine, even without forcing an update).
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Feb 22, 2011
I have a TreeView with a bunch of nodes. I have some code that is supposed to modify the label, however it has no effect. When i step through it in the debugger, I see that the the .Text property has the correct value, but it is not reflected in the GUI. I'm not sure what I'm doing wrong. Here's the code:
[Code]...
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Feb 5, 2012
I would like to know if there is a way to save the text property of a label or any object when i exit the form. For example, if i type in "hello world" in a text box and exit the program, i want "hello world" to become the new text property of that text box when i exit.
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