asked on

problems using a checkedlistbox control in a form from vb.net

Hi experts!

I have this situation:

A form with many controls. One of this contols is a checkedlistbox.

What I need to do, but can`t figure it out how, is to save all the user`s selection from the checkedlistbox in a variable. Then I need to be able to retrieve this user`s selections stored in a variable, read it (somehow) and then get the selected items checked back in the checkedlistbox.

Did I make my point?

It`s something close to getting the selection and then showing the selection again in the checkedlistbox.

Any helpful idea?

nepaluz

Dim clb As New CheckedListBox
Dim clbDic As New Dictionary(Of Integer, Boolean)

' to get the set values
For x = 0 To clb.Items.Count - 1
clbDic.Add(x, clb.GetItemChecked(x))
Next

'to retrieve the values and set them

Dim Result As Boolean = False
For x = 0 To clb.Items.Count - 1
clb.SetItemCheckState(x, CType(clbDic.TryGetValue(x, Result), CheckState))
Next

zandizza

ASKER

it seems as a good idea, I`ll try it right away!

zandizza

ASKER

how to clear the elements in the dictionary?

I need to do this process over and over againg.

did I explain myself?

nepaluz

to clear entire contents of dictionary

clbDic.Clear()

ASKER CERTIFIED SOLUTION

nepaluz

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zandizza

ASKER

I found an easier way to solve it due to the nature of my problem. Though your solution was really helpful because I didn`t know the existence of the Dictionary class.

I`m pretty sure I`ll use it in the near future!

Thanks

nepaluz

Would be nice if you shared your solution ......

zandizza

ASKER

Ok, here it goes my solution!

I had a CheckedListBox, the data collection was formed by the seven days of the week.

I had to be able to capture the user`s selection in a variable.

The variable was a specific column of a row.

When the user clicked on any row of the datagridview the checkedListBox had to show the store information of the previous user`s selection contained in that row.

My problems was how to capture the user`s selection and then how to retrieve it in the CheckedListBox

The solution I found was this.

to get the days selection

For i As Integer = 0 To checkedListBox.CheckedItems.Count - 1

c = chkListDias.CheckedItems(i).ToString
If c = "Monday" Then
Num = Num + 1

ElseIf c = "Tuesday" Then

Num = Num + 2
ElseIf c = "Wednesday" Then

Num = Num + 4
ElseIf c = "Thursday" Then

Num = Num + 8
ElseIf c = "Friday" Then

Num = Num + 16
ElseIf c = "Saturday" Then

Num = Num + 32
ElseIf c = "Sunday" Then

Num = Num + 64
End If
Next

clearing the selected items in the checkedListBox
For i = 0 To 6
chkListDias.SetItemCheckState(i, CheckState.Unchecked)
Next

when retrieving the information

it makes a logical comparation of bits, using And. If both numbers are correct, then I otherwise 0.

Dim j As Integer = 0
Dim g As Integer = 0

For j = 0 To 6
g = Math.Pow(2, j)
If (Num And g) Then
chkListDias.SetItemChecked(j, True)
End If
Next

nepaluz

Thanks for sharing, I am sure someone will find this helpful in good time.