Binding to my property??? How???

[Vlatko]

I would like to write a class that has property, for example, MyText and I
want to be able to bind a Text property of a TextBox to my MyText property.
When I change the value of MyText property in my class that change should be
visible in binded control. How can I do this?

Thx.

P.S. This is just an example. I'm trying to make a property to witch I could
bind other visible components. Like when I bind Text property of textbox1 to
Text property of textbox2, and when I type something in textbox2 it appears
in textbox1. I hope I was clear enough what I'm trying to do. Thx again.

[Frans Bouma]

"Vlatko" <vl************@fer.hr> wrote in
news:uQ**************@TK2MSFTNGP11.phx.gbl:

I would like to write a class that has property, for example, MyText and
I want to be able to bind a Text property of a TextBox to my MyText
property. When I change the value of MyText property in my class that
change should be visible in binded control. How can I do this?

Just create a class with a property MyText and bind it to the
textbox as:

myTextBox.DataBindings.Add("Text", myObjectToBind, "MyText");

To be sure that changes are propagated, you have to define the
event MyTextChanged in the class with the property MyText as well. This
event can be a simple event:

public event EventHandler MyTextChanged;

Then when the value MyText should return changes, you simply raise
that event when there are subscribers:

private string _myText;

public event EventHandler MyTextChanged;

//..

public string MyText
{
get { return _myText; }
set
{
_myText=value;
if(MyTextChanged!=null)
{
MyTextChanged(this, New EventArgs());
}
}
}

the datbinding logic in the controls will bind to the Changed event if
they're binded to a property with the same name. When the event is fired,
they'll refresh themselves with the new value.

FB

--
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[Dmitriy Lapshin [C# / .NET MVP]]

Frans,

the datbinding logic in the controls will bind to the Changed event if
they're binded to a property with the same name. When the event is fired,
they'll refresh themselves with the new value.

Is this property/event name convention described somewhere in MSDN? In other
words, can one safely rely on this naming scheme as an "official" one?

--
Dmitriy Lapshin [C# / .NET MVP]
X-Unity Test Studio
http://x-unity.miik.com.ua/teststudio.aspx
Bring the power of unit testing to VS .NET IDE

[Frans Bouma]

"Dmitriy Lapshin [C# / .NET MVP]" <x-****@no-spam-please.hotpop.com> wrote
in news:#o**************@TK2MSFTNGP10.phx.gbl:

Frans,

the datbinding logic in the controls will bind to the Changed event if
they're binded to a property with the same name. When the event is
fired, they'll refresh themselves with the new value.

Is this property/event name convention described somewhere in MSDN? In
other words, can one safely rely on this naming scheme as an "official"
one?

Unfortunately, it's the official one :) You're looking for 'simple
databinding'. You can find examples of that in the MSDN or online at the
MSDN site.

I say 'unfortunately' because if you have 20 properties, you have
to add 20 events, while it would have been better if there was just 1
event which had the property descriptor of the property that was changed.
That way it would be more flexible. Ah well. :)

FB

--
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