Using (User) settings in C#: Checkboxes: _CheckedChanged() not executed

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Hello all,

here's a pretty simple question I guess:

I added user settings to a couple of checkboxes for my WinForm following this MSDN article: http://msdn.microsoft.com/en-us/library/aa730869%28v=vs.80%29.aspx[^]

I use VS 2012 Express for Desktop.

There's an easy way to add a setting for a control by choosing "new" in the application settings properties of the control. This is what I did, and it works as expected: All checkboxes remain their last state when the form loads.

BUT: the checkboxes toggle the visibility of some labels when the CheckedChanged event occurs:

C#

private void cbExample_CheckedChanged(object sender, EventArgs e)
        {
            lblLabel.Visible = cbExample.Checked;            
        }

When the form first loads, the checkboxes are checked, but the labels remain invisible until I manually uncheck and check the cb again.

What's the proper way to make sure all checked checkboxes, radio buttons and so on do what they should right away?

Thanks for your support,
Best
Dennis

Posted 1-Jan-13 23:04pm

WebMaster

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 1 · 2013-01-01T23:13:00

Solution 1

When the form loads, the event cbExample_CheckedChanged is not called (it only gets executed when checkbox is clicked), so the label remains invisible.

You need to do this in form load event.

Posted 1-Jan-13 23:13pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

Updated 1-Jan-13 23:14pm

v2

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[no name] 2-Jan-13 5:27am

Alright, thanks; so do I have to call every single cb*_CheckedChanged manually in the form load event?

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 2-Jan-13 5:41am

No you don't need to call cbExample_CheckedChanged manually, that is the inbuilt event for checkbox.
You just need to write the codes which you want to execute inside the form load.

Write something like below inside the form load event, but don't call the event....


if(cbExample.Checked)
{
      lblLabel.Visible = cbExample.Checked;
}

[no name] 2-Jan-13 5:47am

Thanks! I have another weird issue which I described in one of my comments in this thread ... label visibility works fine now, but I have to click some checkboxes and radio buttons twice to make them change their checked state...

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 2-Jan-13 6:03am

For this, please check CheckBox.DoubleClick Event and try to implement the codes inside this event.

[no name] 2-Jan-13 6:11am

Hey Tadit, I'm not sure if you misunderstood me ... I do not want to have a double click event; but SOME of the checkboxes seem to NEED to be clicked twice (not double clicked!) to change their checked state. Same thing for some radio buttons. If I have two radio buttons, both 'checked' properties are bound to my settings and one is checked by default, I ALWAYS have to click a rb twice until its checked state changes. More weird, already on the first click the other rbs checked state changes properly.

*Suvabrata Roy* · Answer 2 · 2013-01-01T23:13:00

Hi,

The check change event attach after set of initial values, which you can set from property window.

So the event is not firing.

If you know what is you initial values are then you can easily set which label's you want to visible.

Or

You can set you default value after

C#

InitializeComponent()

function. Then event will fire.

:)

WebMaster · Answer 3 · 2013-01-01T23:27:00

Solution 3

Alright, thanks; so do I have to call every single cb*_CheckedChanged manually in the form load event?

Posted 1-Jan-13 23:27pm

WebMaster

Comments

[no name] 2-Jan-13 5:39am

Oh, I ran into a new weird issue: I need to click a checkbox two times until its checked state will change! this does not affect all checkboxes, but the ones I recently added user settings to ... weird. Can anybody imagine what has happened here? Also two radio buttons are affected: when I click the non-checked one, the checked one is disabled but it needs one more click to enable the clicked one...

One of the affected checkboxes has this code in *Designer.cs:

this.cbExample.Checked = global::MyApp.Properties.Settings.Default.cbExample;
this.cbExample.CheckState = System.Windows.Forms.CheckState.Checked;
this.cbExample.DataBindings.Add(new System.Windows.Forms.Binding("Checked", global::MyApp.Properties.Settings.Default, "cbExample", true, System.Windows.Forms.DataSourceUpdateMode.OnPropertyChanged));

[no name] 2-Jan-13 6:00am

At least I found out that the following code gets executed after clicking a cb the first time:

[global::System.Configuration.UserScopedSettingAttribute()]
[global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
[global::System.Configuration.DefaultSettingValueAttribute("True")]
public bool cbExample {
get {
return ((bool)(this["cbExample"]));
}
set {
this["cbExample"] = value;
}
}

... value is "false" although checked state is true ... checked state is reset to false after execution of the above code.

So I guess I have to modify the default handling of the config files so they will not update everything on every change but on FormClose() or by clicking a "Save" button?

Using (User) settings in C#: Checkboxes: _CheckedChanged() not executed

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