Is it possible to Save a ChecklistBox in the application settings ?

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Is it possible to save a CHECKLISTBOX (not only a Checkbox) in the application settings ?

I want to retreive my checkboxes checked in my CheckListBox when i load my form ?

Posted 24-Nov-11 2:51am

contact97438

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LanFanNinja 24-Nov-11 11:58am

Check my solution

3 solutions

Solution 1

You don't save a control, you persist the controls state and values. Yes, it is possible to have this stored in you app.config

Posted 24-Nov-11 2:57am

Not Active

Solution 2

You Can't Save the Whole Control.You can Save the State of the CheckBoxList into the App.config file which stores the data in XML format from that you can check the State of CheckBox whether it is Checked or Not.

Posted 24-Nov-11 3:18am

Manoj K Bhoir

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contact97438 24-Nov-11 9:49am

OK, that's what i mean, but i don't know how to do that, cause i've got many members in my collection. I must create a field for all the checklistBox, or i must create a field for each item of the collection ?

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LanFanNinja · Accepted Answer · 2011-11-24T05:58:00

Solution 3

Well I am sure there are many ways but maybe this will help.

EDIT: All below changed to VB.Net for the OP.

First create a new property in your settings file
1) Right click your project in the solution explorer
2) Click on properties
3) Click on settings tab
4) Add a new property called CheckedListState and set its type to string

Then use below code (modify for your use)

VB

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    Dim checkedStates As String() = My.MySettings.Default.CheckedListState.Split(New Char() {","c}, StringSplitOptions.RemoveEmptyEntries)

    For i As Integer = 0 To checkedStates.Length - 1
        CheckedListBox1.SetItemChecked(i, Boolean.Parse(checkedStates(i)))
    Next
End Sub

Private Sub Form1_FormClosing(sender As Object, e As FormClosingEventArgs) Handles MyBase.FormClosing
    My.MySettings.Default.CheckedListState = ""
    For i As Integer = 0 To CheckedListBox1.Items.Count - 1
        My.MySettings.Default.CheckedListState += CheckedListBox1.GetItemChecked(i).ToString() & ","
    Next

    My.MySettings.Default.Save()
End Sub

Ask me if you have any questions about this code and I will try to help you figure it out.

Posted 24-Nov-11 5:58am

LanFanNinja

Updated 25-Nov-11 6:55am

v5

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contact97438 25-Nov-11 5:54am

@LanFanNinja : Hello,

Thanks for the code.
First of all, im' not used with C#, is the code below correct ?

------
Private Sub Form1_Load(sender As Object, e As EventArgs)
Dim checkedStates As String() = Settings.[Default].CheckedListState.Split(New Char() {","C}, StringSplitOptions.RemoveEmptyEntries)

For i As Integer = 0 To checkedStates.Length - 1
checkedListBox1.SetItemChecked(i, Boolean.Parse(checkedStates(i)))
Next
End Sub

Private Sub Form1_FormClosing(sender As Object, e As FormClosingEventArgs)
Settings.[Default].CheckedListState = ""
For i As Integer = 0 To checkedListBox1.Items.Count - 1
Settings.[Default].CheckedListState += checkedListBox1.GetItemChecked(i).ToString() + ","
Next

Settings.[Default].Save()
End Sub

'=======================================================
'Service provided by Telerik (www.telerik.com)
'Conversion powered by NRefactory.
'Twitter: @telerik, @toddanglin
'Facebook: facebook.com/telerik
'=======================================================

2/. I never use the Settings.vb ; Is this correct ?

Namespace My

'Cette classe vous permet de gérer des événements spécifiques dans la classe de paramètres :
' L'événement SettingChanging est déclenché avant la modification d'une valeur de paramètre.
' L'événement PropertyChanged est déclenché après la modification d'une valeur de paramètre.
' L'événement SettingsLoaded est déclenché après le chargement des valeurs de paramètre.
' L'événement SettingsSaving est déclenché avant l'enregistrement des valeurs de paramètre.
Partial Friend NotInheritable Class MySettings

Public CheckedListState As String

End Class
End Namespace

3/. Here's my modifications :

LOAD FORM
Dim checkedStates As String() = My.Settings.CheckedListState.Split(New Char() {","c}, StringSplitOptions.RemoveEmptyEntries)

For i As Integer = 0 To checkedStates.Length - 1
CheckedListBoxPJ.SetItemChecked(i, Boolean.Parse(checkedStates(i)))
Next

And FORM CLOSING :
Private Sub Form1_FormClosing(sender As System.Object, e As System.Windows.Forms.FormClosingEventArgs) Handles MyBase.FormClosing

My.Settings.CheckedListState = ""
For i As Integer = 0 To CheckedListBoxPJ.Items.Count - 1
My.Settings.CheckedListState += CheckedListBoxPJ.GetItemChecked(i).ToString() + ","
Next

My.Settings.Save()

End Sub

4/. I've got a NullReferenceException on the .RemoveEmptyEntries
Do you know why ?

Thanks for your help

LanFanNinja 25-Nov-11 12:53pm

Hello! Please recheck my solution I have changed it to VB.Net for you. I don't really have the time right now to give your code a fair read through. If your are still having problems with this code let me know and I will try to help.

contact97438 25-Nov-11 14:04pm

@LanFanNinja : It doesn't work on the form Load.

I see things that are different, and an error on this line :

Dim checkedStates As String() = My.MySettings.Default.CheckedListState.Split(New Char() {","c}, StringSplitOptions.RemoveEmptyEntries)

When i enter My.MySettings.Default ("Default" is not accepted).

I put this, look if there's something wrong in it :

Public Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Dim checkedStates As String() = My.Settings.CheckedListState.Split(New Char() {","c}, StringSplitOptions.RemoveEmptyEntries)

For i As Integer = 0 To checkedStates.Length - 1
CheckedListBoxPJ.SetItemChecked(i, Boolean.Parse(checkedStates(i)))
Next

LanFanNinja 25-Nov-11 15:13pm

I am not sure why My.MySettings.Default.CheckedListState is not working but
My.Settings.CheckedListState is the same so will work fine. Is this code not working?? Are you getting errors? If so post them.

contact97438 25-Nov-11 22:28pm

@LanFanNinja :

Yes, i have a "NullReferenceException" error : "Object reference not set to an instance of an object." on this line of code :

Dim checkedStates As String() = My.Settings.CheckedListState.Split(New Char() {","c}, StringSplitOptions.RemoveEmptyEntries)

LanFanNinja 26-Nov-11 1:35am

Never mind my previous comment (if you even got to read it).

Are you using the below code in your project?
Namespace My
Partial Friend NotInheritable Class MySettings
Public CheckedListState As String
End Class
End Namespace

If so this is not correct!
You need to remove this and create a new property called "CheckedListState" in your Settings.vb file using the instructions in my solution. Just to be clear you would do this like so:
Right click on your project in the solution explorer (double clicking on the "My Project" folder in the solution explorer should do the same).
Next click on the "Settings" tab at the left side of the properties tab window that opened and add a new property of type string (the default I believe) called "CheckedListState" (WITHOUT quotes of course).

Here is a link to an image of the properties window I am speaking of
http://www.vbcodesource.com/screenshots/vbNet2005/appPositionSizeSettingsView.jpg

contact97438 26-Nov-11 7:06am

@LanFanNinja :

Are you using the below code in your project? YES
Namespace My
Partial Friend NotInheritable Class MySettings
Public CheckedListState As String
End Class
End Namespace

I've changed as you say, and now it works perfectly !!!
Many thanks

LanFanNinja 26-Nov-11 11:14am

You're welcome! :) And good luck with your project.