[RESOLVED] Boolean setting on a checkbox, How it performs checked event?

[pourkascheff]

Consider there's a boolean setting called "unit" which true = imperial and false = metric, already set on a checkbox ApplicationSettings: checked property.

The app follows its value once app runs. I set true, closed, opened it is still true. Make it false, it keeps false. But neither checked = true nor checked = false code won't perform. Why? What's missing?

Should I add a sort of performclick recalls or should I change the way I use settings?
All links and videourls are welcome here.

[TysonLPrice]

Consider there's a boolean setting called "unit" which true = imperial and false = metric, already set on a checkbox ApplicationSettings: checked property.

The app follows its value once app runs. I set true, closed, opened it is still true. Make it false, it keeps false. But neither checked = true nor checked = false code won't perform. Why? What's missing?

Should I add a sort of performclick recalls or should I change the way I use settings?
All links and videourls are welcome here.

I'm having trouble following that. Could you post the relevant code?

[pourkascheff]

Of course.
1) Consider following form:


2) Already made a boolean setting:


2) Made sure that setting is linked to "checked" property of a checkbox:


3) Here's the code:

Public Class Form2
    Private Sub CheckBox1_CheckedChanged(sender As Object, e As EventArgs) Handles CheckBox1.CheckedChanged
        If CheckBox1.Checked = True Then
            Label1.Text = "METRIC"
        Else
            Label1.Text = "IMPERIAL"
        End If
    End Sub
End Class

4) Result: When the form opens in runtime, it keeps the value I changed before and save in application shutdown (Works fine) but the label - and possible other controls to be triggered relied to situation of UNIT boolean thing - is not working. The string "Label1" (Default text) is on label.

5) What is missing? How can I trigger the checkbox to see what does it contain in itself? Should I change the way I use vb.net applicationsettings?

[techgnome]

air code, untested, use at own risk, no warranties ....

Public Class Form2

    Private Sub Form2_Load() Handels Form2.Load
        SetUnits()
    End Sub

    Private Sub CheckBox1_CheckedChanged(sender As Object, e As EventArgs) Handles CheckBox1.CheckedChanged
        SetUnits()
    End Sub

    Private Sub SetUnits()
        If CheckBox1.Checked = True Then
            Label1.Text = "METRIC"
        Else
            Label1.Text = "IMPERIAL"
        End If
    End Sub
End Class

-tg

[dbasnett]

This should work,

    'in the Form Shown Event
    'CheckBox1.Checked = Not CheckBox1.Checked
    'CheckBox1.Checked = Not CheckBox1.Checked

    Private Sub CheckBox1_CheckedChanged(sender As Object, e As EventArgs) Handles CheckBox1.CheckedChanged
        'don't need the equals true
        If CheckBox1.Checked Then
            Label1.Text = "METRIC"
        Else
            Label1.Text = "IMPERIAL"
        End If
    End Sub

[pourkascheff]

Oh, good old "function"ing way and older "toggling twice" friends. Thanks to you two. These are my final solutions in case no more standard ways were available out there.

[OptionBase1]

Oh, good old "function"ing way and older "toggling twice" friends. Thanks to you two. These are my final solutions in case no more standard ways were available out there.

I think you have to look at this in the same way as if you set the default value directly while in the Designer. If you set it to Checked in the designer, the CheckedChanged event doesn't fire when you start the program to indicate that the box was checked. It is "born" checked.

So, if you need to take some action based on the initial state of the CheckBox when the form is loaded, then you need to perform that check in the Load event.

[techgnome]

I think you have to look at this in the same way as if you set the default value directly while in the Designer. If you set it to Checked in the designer, the CheckedChanged event doesn't fire when you start the program to indicate that the box was checked. It is "born" checked.

So, if you need to take some action based on the initial state of the CheckBox when the form is loaded, then you need to perform that check in the Load event.

Precisely.... that's why I factored it out into a sub and then just called it from form load and checkstate change


-tg

[jmcilhinney]

This doesn't change the principle involved but, for brevity, I would change this:

If CheckBox1.Checked Then
    Label1.Text = "METRIC"
Else
    Label1.Text = "IMPERIAL"
End If

to this:

Label1.Text = If(CheckBox1.Checked, "METRIC", "IMPERIAL")