将事件添加到集合中，然后触发该集合中的所有事件C＃

Question

I'm starting to think I'm delving into the impossible.

So basically when a property is changed it will fire an event:

private DateTime _DateFrom;

public DateTime DateFrom
{
    get
    {
        return _DateFrom;
    }
    set
    {
        var oldValue = _DateFrom;
        _DateFrom = value;

        if (_DateFrom != oldValue)
        {
            //GetPropertyName is an extension method 
            //Used Specifically for notifying of priority changed fields
            NotifyPropertyChanged(ReflectionTypes.GetPropertyName(() => this._DateFrom));
        }
    }
}

Once subscribed will fire and then pass to a switch statement that determines which other events to fire. Because an event can appear twice, I would like to add an event to a collection and then fire all those events in the collection.

public void OnOpportuntiyPropertyChanged(object sender, PropertyChangedEventArgs e)
{

    //Event Collection HERE?

    switch (e.PropertyName)
    {
            //Remove hard coded strings and replace with reflection
        case "DateFrom":
            //Event Name + Add to Event Collection
            //Event Name + Add to Event Collection
            break;
        case "SomeOtherChange":
            //Event Name + Add to Event Collection
            break;
        case "MoreChanges":
            //Event Name + Add to Event Collection
            //Event Name + Add to Event Collection
            //Event Name + Add to Event Collection
            break;
    }

    //Events will fire with successful subscription(from another location)
}

I cannot seem to get my head around this one, any help greatly appreciated! So to re-cap I would like to declare an events collection then iterate through the switch and then add to collection. Once the switch process has finished, I would like to fire all events in the collection.

//EDITS

So I'm hoping that explaining the process it will clear things up a little.

So on the UI layer within a form, a user changes the "DateFrom" field which then passes up to the "DateFrom" property (Opportunity Class). As this is a business critical change (Custom Travel CRM) an event needs to fire (NotifyPropertyChanged).

Once we hit the NotifyPropertyChanged event, it needs to determine which property has been changed. The idea is to snap in more than one business critical event hence adding to a collection.

The main reason for the collection is because more than one property type in the switch can have the same event and I don't want to fire those twice.

I hope this is cleared a few things up and more then happy to embark on a new path, if the "said" solution is not a appropriate.

In the original spec I forced the idea of events, so ideally need to make this work in the most extensible manner. Adding events to a collection was an idea inspired from the project manager.

Regards,

Answer 1

I'm asking how do i create the collection, how do add to the collection and how to fire all those in the collection

I think you can do what you want using a collection of Action . Here is the code:

//(1)create collection
List<Action> actions = new List<Action>();

switch (e.PropertyName)
{
    case "DateFrom":
        //(2)add to the collection
        actions.Add(new Action(() => {/* What you want to do in this case */ }));

    //....
}

//(3)fire all those in the collection
foreach (var item in actions)
{
    item();
}