Set The Text Of List Items In Windows Forms?

May 28, 2009

how to set the value of the text that is displayed for each item of a list control, such as a checkbox list, but really this applies to most list controls, not just the checklistbox control.

I have a checklistbox control,

Friend WithEvents clstTasks As System.Windows.Forms.CheckedListBox

that I usually want to populate with a list of task names. I call the add method to add a Task object to the list. I know that if I override the ToString method, whatever value is returned by that function will be displayed as the text for the list item.

However, in rare situations, I want to display something else other than just the name. For example, perhaps I want to display the name and the value of another property, such as the value of the Boolean property "Optional" shown in parenthesis following the name.

The best that I can think of is to define a property which is set in the GUI layer and then used by the ToString function to determine how it should behave when called. If the controlling property is set to one value, the ToString will return the Name, else it will return the Name followed by the value of the Optional flag. This seems a little disjoint a kludged to me.

The other alternative which seems a little overkill is to define a new class which inherits from Task, for example TaskOptional, which overrides the Tostring method on the base class. In this subclass, the ToString function would return the Name/Optional flag value. However, this, too, seems a little nuts to have to come up with a new class just to modify how the text is being displayed in the presentation layer. I feel that I should be able to control this in the presentation layer without changing the business object or creating a new derived object.

What is the best way to accomplish this?

For Each CurrentTask As Task In _MasterTaskList
clstTasks.Items.Add(CurrentTask, True)
Next

[Code]....

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Hi, I'm working on a program that reads text entered into a textbox and creates a list of items by separating entries by commas. Everything is working fine, except, because I am using an array to store the items in the list, I have a limited number of entries. This is only a problem because, as it is written currently, each comma counts as an individual entry. Therefore, users can enter ",,," for example, and it would use up 3 places in the array.

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Here is my code for extra clarity:

Public Class frmMain
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[code]...

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Imports System.Collections.Generic
Imports System.Net
Imports System.IO

[Code]...

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Friend Class ExecutableItem
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[code].....

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[Code]...

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[Code]....

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[Code].....

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[Code]....

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[Code]...

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Imports System.Collections.GenericI
mports System.Net
Imports System.IO
Public Class Form2
'Dim filename As String
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[Code]...

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I've experimented with GetType and TypeOf but have not managed to get anything working.

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Public Class frmCheckOut
Dim i As Integer
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[code].....

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