Event

[Thomas]

Hi there

I build a class "ButtonClass" with two private
Buttons, "OK" And "Cancel".
Now, I would like to use this class in a Windowsform for
example three times.

ButtonClass c1 = new ButtonClass();
ButtonClass c2 = new ButtonClass();
ButtonClass c3 = new ButtonClass();

I assume the EventListener and its function is in the
ButtonClass. How do I know know which Button was pressed,
because I have just one Listener for each of the Buttons?

Thanks for helping

Thomas

[Thomas]

Hi Mikael

Thank you for helping. I'll try it this evening.

-----Original Message-----
Hi Thomas!

In your case your buttonclass would have to throw events that is picked upby your main class.

First of you need to create delegates that tells everyone what the eventshould look like. Place this outside your class.

public delegate void OkClickEventHandler(object sender, EventArgs e);public delegate void CancelClickEventHandler(object sender, EventArgs e);
public class ButtonClass
{
//Now inside your buttonclass you add the events so that they can befired.
public event EventHandler OkClick;
public event EventHandler CancelClick;

//This is not really nessessary to have, but I usually have it anywaysince it
//keeps things simple and that you might want to change the event a bitif
//you inherit from the ButtonClass

protected virtual void OnOkClick(EventArgs e)
{
if (OkClick != null) //If someone is ready to handle the event {
OkClick(this, e); //Fire the event
}
}

protected virtual void OnCancelClick(EventArgs e)
{
if (CancelClick != null) //If someone is ready to handle the event {
CancelClick(this, e); //Fire the event
}
}

private void okButton_Click(object sender, System.EventArgs e) //Thebasic event fired by clicking the button
{
OnOkClick(EventArgs.Emtpy); //Try to fire the event if someone islistening for it
}

private void cancelButton_Click(object sender, System.EventArgs e) {
OnCancelClick(EventArgs.Empty);
}
}

In your main class you need to listen for the events that the buttonclassfires. Unless you do this you will never know when a button i pressed. So inyour main class you need to do this

ButtonClass bc01 = new ButtonClass();
bc01.OkClick += new EventHandler(bc01_OkClick); //Start listening for okbutton click in buttonclass bc01
bc01.CancelClick += new EventHandler(bc01_CancelClick);

ButtonClass bc02 = new ButtonClass();
bc02.OkClick += new EventHandler(bc02_OkClick);
bc02.CancelClick += new EventHandler(bc02_CancelClick);
And so on.

Finally you need a method that handles the events that has been fired
private void bc01_OkClick(object sender, EventArgs e)
{
//Do what you want to do if they press OK in bc01
}

This way you know exactly which ButtonControl is throwing the event andwhich button in the control also.

I hope this helps you out. Personally I got tired of doing all these stepsso I made a smal event generator that does this stuff for me. Just copy andpaste, which is quite nice and timesaving :)

//Mikael

"Thomas" <th***********@freesurf.ch> wrote in message
news:0a****************************@phx.gbl...

Hi there

I build a class "ButtonClass" with two private
Buttons, "OK" And "Cancel".
Now, I would like to use this class in a Windowsform for example three times.

ButtonClass c1 = new ButtonClass();
ButtonClass c2 = new ButtonClass();
ButtonClass c3 = new ButtonClass();

I assume the EventListener and its function is in the
ButtonClass. How do I know know which Button was pressed, because I have just one Listener for each of the Buttons?
Thanks for helping

Thomas

.

[Prateek]

Hi,

I maybe wrong here but from what I gather you have a class called
ButtonClass and this class implements the click event. Now, you have created
three ButtonClass objects and want to know which button was pressed in the
click event handler.. I assume you can use the this keyword in the
ButtonClass which will refer to the current object that raised the click
event...

Again, I may have made a mistake in understanding your query..

-Prateek

"Thomas" <th***********@freesurf.ch> wrote in message
news:0a****************************@phx.gbl...
Hi there

I build a class "ButtonClass" with two private
Buttons, "OK" And "Cancel".
Now, I would like to use this class in a Windowsform for
example three times.

ButtonClass c1 = new ButtonClass();
ButtonClass c2 = new ButtonClass();
ButtonClass c3 = new ButtonClass();

I assume the EventListener and its function is in the
ButtonClass. How do I know know which Button was pressed,
because I have just one Listener for each of the Buttons?

Thanks for helping

Thomas