Trying to bind to Visible or Enabled property of form control

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Sam Martin - 16 Aug 2005 12:15 GMT

Hi,

just a quick one.
i'm trying to bind the Visible property of a control to a public property of
the parent form.
i.e.
private bool _okToDoSomething = false;

public bool IsOkToDoSometing {
get { return this._okToDoSomething; }
}

/// then in initialisation
this.buttonDoSomething.DataBindings.Add("Enabled",this, "IsOkToDoSomething");

i've read that binding can only occur if bound object implement IList (which
the form obviously doesn't) - so is something like this possible? and if so
how do I do it?

Signature

TIA
Sam Martin

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Bart Mermuys - 16 Aug 2005 13:36 GMT

Hi,

> Hi,
>
[quoted text clipped - 17 lines]
> the form obviously doesn't) - so is something like this possible? and if
> so

Well, binding of lists obvious need to implement IList (or at least
IListSource), but you can also bind to any property of any object.

You do need to add an event (propertyname + 'Changed'), so that bound
control(s) know when the property has changed, eg:

public event IsOkToDoSomethingChanged;

public bool IsOkToDoSometing
{
get { return this._okToDoSomething; }
set
{
_okToDoSomething = value;

// fire event
if ( IsOkToDoSomethingChanged!=null )
IsOkToDoSomething( this, EventArgs.Empty );
}
}

// then in initialisation
this.buttonDoSomething.DataBindings.Add("Enabled",this,
"IsOkToDoSomething");

Now you can use IsOkToDoSometing property to toggle button enabled state.

HTH,
Greetings

> how do I do it?

Reply to this Message

Sam Martin - 16 Aug 2005 14:36 GMT

hi bart, thanks for that

however, i've done as you said but the bindings are being updated.
when i step through a call to the IsNewAgreementCreated_set, the event is
not handled and is <undefined value>.

the binding is done after the call to InitialiseComponent.

this.newAgreementPanel.DataBindings.Add("Visible",this,"IsNewAgreementCreated");

        public event EventHandler IsNewAgreementCreatedChanged;
        public bool IsNewAgreementCreated
        {
            get { return this._createdAgreement; }
            set
            {
                this._createdAgreement = value;

                if (IsNewAgreementCreatedChanged!=null)
                    IsNewAgreementCreatedChanged(this,EventArgs.Empty);
            }
        }

is there anything else i need to do??

Signature

TIA
Sam Martin

> Hi,
>
[quoted text clipped - 51 lines]
>
> > how do I do it?

Reply to this Message

Bart Mermuys - 16 Aug 2005 15:56 GMT

Hi,

> hi bart, thanks for that
>
> however, i've done as you said but the bindings are being updated.

I guess you mean aren't updated .

> when i step through a call to the IsNewAgreementCreated_set, the event is
> not handled and is <undefined value>.

If you set IsNewAgreementCreated after binding, then the event shouldn't be
<undefined value>, so something isn't working.

> the binding is done after the call to InitialiseComponent.

That shouldn't be a problem.

> this.newAgreementPanel.DataBindings.Add("Visible",this,"IsNewAgreementCreated");
>
[quoted text clipped - 10 lines]
> }
> }

I have copy/pasted the above code and added the private variable
_createdAgreement and a panel and it works perfectly (using net 1.1 vc2003).
I have no idea why it doesn't for you, maybe something's different but it's
not in the posted code.

Greetings

> is there anything else i need to do??
>
[quoted text clipped - 55 lines]
>>
>> > how do I do it?

Reply to this Message

Sam Martin - 16 Aug 2005 16:43 GMT

thank for your help mate

Signature

TIA
Sam Martin

> Hi,
>
[quoted text clipped - 95 lines]
> >>
> >> > how do I do it?

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Trying to bind to Visible or Enabled property of form control

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