Select All / Deselect All checkboxes

General
1

Hi All,

I am working on a Windows program and it has about 50 or so checkboxes on one page. I have an additional checkbox to select all / deselect all but I just am not sure how to loop through all the given checkboxes to set their values to true or false.

Any help would be appreciated.
Roger

2

Check out the IsA operator IsA

3

Brian. That worked really well. However, it is affecting all checkboxes in my program. I have these key checkboxes in a TabPanel. How would I segregate these from all others. This is how I have my code setup now:

 If CheckBox137.Value = False  Then
      
      For j As Integer = 0 To Self.ControlCount - 1
        
        If Self.Control(j) IsA CheckBox Then
          
          CheckBox(Self.Control(j)).Value = False
          CheckBox137.Caption = "Select All"
          
        End If
      Next
      
    end if

    if CheckBox137.Value = True Then
      
      For i As Integer = 0 To Self.ControlCount - 1
        
        If Self.Control(i) IsA CheckBox Then
          
          CheckBox(Self.Control(i)).Value = True
          CheckBox137.Caption = "Deselect All"
          
        End If
      Next
      
    End if
4

By giving all the checkBoxes that belong together the same name (e.g. Tab1CheckBoxes, Tab2CheckBoxes, etc), which turns them into a control array (so they have the same name but different indexes).

Then just iterate over the respective control array and turn all of them on or off.

for each cb as CheckBox in Tab1CheckBoxes
cb.value = true
next

[untested code]

1 Like
5

You should avoid having two loops so similar. That’s bad practice (for example, if you need to change something later, you must make the change twice).
Also, you’re setting the Checkbox137’s caption every time you’re encountering a checkbox; just do that once, after the loop.

This code would do the same as above:

  For j As Integer = 0 To Self.ControlCount - 1
   
    If Self.Control(j) IsA CheckBox Then
      
      CheckBox(Self.Control(j)).Value = CheckBox137.Value
      
    End If
  Next

if CheckBox137.Value=false then
 CheckBox137.Caption = "Select All"
Else
 CheckBox137.Caption = "Deselect All"
end if

As would this one, more compact:

  For j As Integer = 0 To Self.ControlCount - 1
    var Ctrl As Control=Self.Control(j) //Used twice, so keep in a variable
    If Ctrl IsA CheckBox Then CheckBox(Ctrl).Value = CheckBox137.Value
  Next

CheckBox137.Caption=if(CheckBox137.Value,"Deselect All","Select All")

HTH

6

Hi Arnaud,

Your solution was the perfect touch. Now everything works exactly as I expected. Thanks a million!

7

Hi Roger,
Glad it suited your needs; you’re welcome.