Event Queue

[tb2500]

Dear all,

I want to create a Queue to add events that have been raised to, so later these events can be popped off the Queue stack and an appropriate Event Handler can be assigned. I wondered if this is actually possible?

How do I add events to a Queue?

So here's how it should go:

1. Raise an event ( no event handler for it exists yet )
2. Add this raised event to a Queue ( or a reference to it )
3. Sometime later... Take event off Queue and assign handler
4. Execute Handler

Hope somebody can help?

[cloud255]

Dear all,
So here's how it should go:

1. Raise an event ( no event handler for it exists yet )
2. Add this raised event to a Queue ( or a reference to it )
3. Sometime later... Take event off Queue and assign handler
4. Execute Handler

I don't think this is the correct order of operation with which to approach this situation.

I would suggest that you create a class which exposes a delegate and a raise() method.

You need to at some point pass a function to the delegate within your class. I would suggest you use a List instead of a queue as this would make access to any given element of the List far neater.

Next you can create a list of your class type eg:

List<MyClass> EventsList = new List<MyClass>();

You can then add instances of your class to the list:

MyClass customEvent = new MyClass();
EventsList .Add(customEvent );

You may then add pass the event handler to the delegate of your class:

EventsList [index].MyEvent += new MyClass.MyDelegate(EventHandler);

Later on you can then raise the event and remove it from the list:

EventsList [index].Raise();
EventsList.Remove(customEvent);

If I may ask, why do you want to delay the execution of events?

[tb2500]

Hi,

To answer your question...
I have a program with 2 Forms. Form A is active when program starts and does some work, then after user clicking Button, Form B becomes active and Form A Closes down. I want to pass data from form A to Form B through an event, but since Form B doesn't exist at the time the data in Form A is created, I need to delay the handling of the event.

Unless you have another way of sharing data between two classes?

Thanks again for your help.

[cloud255]

Hi,

Well sure you create a class which will hold all the required data. Create and instance of that class and populate it in form 1.

Then you simply pass that instance to form 2 by either exposing a property in form 2 or by adding a parameter of the class type to form2's constructor...

private MyDataHolderClass copyOfForm1Data = new  MyDataHolderClass ();

public frmSecondForm(MyDataHolderClass dataFromForm1)
        {
            InitializeComponent();
            copyOfForm1Data = dataFromForm1;
        }

and then frmSecondForm has all the data captured in form1.

[tb2500]

Hi,

Thanks for that! :) That was very helpful. I think I was trying to make it too complicated.