generating events in user defined controls

[Liz - Newbie]

I need to generate an event in a user defined control
when I have changed a variable, so that I can pick it up
in my main form and take it from there.

Can someone explain the SIMPLEST way of doing this.

Liz (newbie to OO)

[Nicholas Paldino [.NET/C# MVP]]

Re: generating events in user defined controls

Liz,

Assuming that your variable is exposed as a property, you can do the
following:

// Assume the property is named MyProperty. Define your event like this:
public event EventHandler MyPropertyChang ed;

This will define your event as type EventHandler. Then, when the value
changes, you can make the following call:

// Check to see if there are any events to fire.
EventHandler pobjHandlers = MyPropertyChang ed;

// If there are handlers, then fire the event.
if (pobjHandlers != null)
// Fire the event.
pobjHandlers(th is, EventArgs.Empty );

Then, your form would pick up the event like any other event. Also, the
name of the event and the type are important here. The reason I suggested
this is because naming the event like this makes your class fit more into
the data binding model (the data grid and property grid will pick up on the
property change, for example).

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard. caspershouse.co m


"Liz - Newbie" <ecollins@cornw all.gov.uk> wrote in message
news:080301c3a7 8d$e78fbc90$a60 1280a@phx.gbl.. .[color=blue]
> I need to generate an event in a user defined control
> when I have changed a variable, so that I can pick it up
> in my main form and take it from there.
>
> Can someone explain the SIMPLEST way of doing this.
>
> Liz (newbie to OO)[/color]

[Liz]

Re: generating events in user defined controls

Bless you - it worked! I'm not certain quite how it all
works but it worked. I can now use this as a basis for
passing events back to my form. Thanks a million

Liz


[color=blue]
>-----Original Message-----
>Liz,
>
> Assuming that your variable is exposed as a[/color]
property, you can do the[color=blue]
>following:
>
>// Assume the property is named MyProperty. Define your[/color]
event like this:[color=blue]
>public event EventHandler MyPropertyChang ed;
>
> This will define your event as type EventHandler.[/color]
Then, when the value[color=blue]
>changes, you can make the following call:
>
>// Check to see if there are any events to fire.
>EventHandler pobjHandlers = MyPropertyChang ed;
>
>// If there are handlers, then fire the event.
>if (pobjHandlers != null)
> // Fire the event.
> pobjHandlers(th is, EventArgs.Empty );
>
> Then, your form would pick up the event like any[/color]
other event. Also, the[color=blue]
>name of the event and the type are important here. The[/color]
reason I suggested[color=blue]
>this is because naming the event like this makes your[/color]
class fit more into[color=blue]
>the data binding model (the data grid and property grid[/color]
will pick up on the[color=blue]
>property change, for example).
>
> Hope this helps.
>
>
>--
> - Nicholas Paldino [.NET/C# MVP]
> - mvp@spam.guard. caspershouse.co m
>
>
>"Liz - Newbie" <ecollins@cornw all.gov.uk> wrote in[/color]
message[color=blue]
>news:080301c3a 78d$e78fbc90$a6 01280a@phx.gbl. ..[color=green]
>> I need to generate an event in a user defined control
>> when I have changed a variable, so that I can pick it[/color][/color]
up[color=blue][color=green]
>> in my main form and take it from there.
>>
>> Can someone explain the SIMPLEST way of doing this.
>>
>> Liz (newbie to OO)[/color]
>
>
>.
>[/color]