how to disable multi select of checkbox in listview ?

Denver Thomas

Hi , Is there any way to disable multi select of checkbox in a list view ?.ie one should be able to check only one row at a time. With warm regards :laugh:

Wendelius

You can use ItemChecked event and uncheck all already checked items in this event and leave only the newly checked intact. Although I think it's not a good UI design if you have checkboxes for list items and still the user is able to check only one item at a time. Checkboxes are used when multiple choices can be selected, so single selection list with check boxes would give the user a wrong impression. Could you simply set MultiSelect to false (without checkboxes).

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Reza Raad

did you mean listbox or CheckBoxList???? if you mean listbox, so there is no problem, just set SelectionMode property to Single. if you mean CheckBoxList, so it's better to use RadioListBox for single selection. if you want CheckBoxList for single selection you must code for it on selectedindexchange event on checkboxList.

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hground

I know this question was asked over a year ago, but I have been searching for an answer myself with little success and wanted to get this out there to save others who may be searching the hours of frustration I encountered. I finally came up with the following VB .NET code to take care of the problem:

'Declare a Form global boolean to keep the ItemChecked event from being called in an infinite loop
Dim bFirstChange as Boolean = True

Private Sub Listview1\_ItemChecked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ItemCheckedEventArgs) Handles Listview1.ItemChecked
    If ((ModifierKeys = Keys.Control) Or (ModifierKeys = Keys.Shift)) Then
        If (bFirstChange) Then
            bFirstChange = False
            e.Item.Checked = Not e.Item.Checked
        Else
            bFirstChange = True
        End If
        Exit Sub
    End If
    'Accentuate that the row is checked
    If (e.Item.Checked) Then
        e.Item.SubItems(0).Text = "+"
        e.Item.BackColor = Color.LightYellow
    Else
        e.Item.SubItems(0).Text = "-"
        e.Item.BackColor = Color.White
    End If
End Sub

This worked for me to keep the Checked property unchanged. Not sure about the "thread safe-ness" of this, but not a problem for me in the form I am working with. You should be able to easily convert this if you need it in C# instead of VB. HTH - hground

molesworth

Cool - thanks for this, and for letting me know on the other, older thread. I ended up with a work-around keeping track of which entries were supposed to be checked, but this looks much simpler. I'll convert it to C# and give it a go. Thanks again :thumbsup:

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MarqW

I've got a better solution:

Private Sub ListView1_ItemCheck(ByVal sender As Object, ByVal e As System.Windows.Forms.ItemCheckEventArgs) Handles ListView1.ItemCheck
If (ModifierKeys And (Keys.Shift Or Keys.Control)) <> 0 Then e.NewValue = e.CurrentValue
End Sub

Enjoy

mycleverscreenname

For some reason, the first solution, translated into C++/CLI, will create a stack overflow if you shift- or control-click anywhere besides the "Name" column. MarqW's solution, translated into C++/CLI works fine. No need for global variables.

private: System::Void listView1_ItemCheck(System::Object^ sender, System::Windows::Forms::ItemCheckEventArgs^ e)
{
if( (ModifierKeys == Keys::Control) || (ModifierKeys == Keys::Shift) )
{
e->NewValue = e->CurrentValue;
}
}

It's the difference between the ItemCheck and ItemChecked events.

modified on Monday, August 23, 2010 3:30 PM

jerryno6

It's very good guide. Can you convert it to C# ?

MarqW

Seriously? The reply above has already converted it to C#. Even if you hadn't seen that, it's one line of code which pretty much translates as-is, apart from If Then, becomes If( )

jerryno6

Phew, i found out : this is in C#

if (Control.ModifierKeys == Keys.Shift || Control.ModifierKeys == Keys.Control)
{
e.NewValue = e.CurrentValue;
}

MarqW

Just a little improvement for you. This one only performs one check condition, and handles the case if both keys are pressed (or one key with Alt or Win)

if( (Control.ModifierKeys & (Keys.Shift | Keys.Control)) )
{
e.NewValue = e.CurrentValue;
}