Hi I'm hoping one of you could help me with some syntax.
So I'm following this example https://www.codeproject.com/Tips/591221/Simple-EventAggregator-in-WPF-PRISM on using Prism Event Aggregator to send messages from one ViewModel to another.
The following code works great when publishing a single string as the payload.
internal class OrderSelectedEvent_SS : PubSubEvent<string>
{
private static readonly EventAggregator _eventAggregator;
private static readonly OrderSelectedEvent_SS _event;
static OrderSelectedEvent_SS()
{
_eventAggregator = new EventAggregator();
_event = _eventAggregator.GetEvent<OrderSelectedEvent_SS>();
}
public static OrderSelectedEvent_SS Instance
{
get { return _event; }
}
}
Publisher (In ViewModel1):
OrderSelectedEvent_SS.Instance.Publish(_strCurrentOrder);
Subscriber (In ViewModel2:
OrderSelectedEvent_SS.Instance.Subscribe(OrderSelectedEventHandler_SS);
private void OrderSelectedEventHandler_SS(string strSelectedOrder)
{
CurrentOrder = strSelectedOrder;
}
What I'm trying to do is modify to accept an object (a class with multiple strings) as the payload. Here's what I have so far:
internal class OrderSelectedEvent : PubSubEvent<object>
{
private static readonly EventAggregator _eventAggregator;
private static readonly OrderSelectedEvent _event;
static OrderSelectedEvent()
{
_eventAggregator = new EventAggregator();
_event = _eventAggregator.GetEvent<OrderSelectedEvent>();
}
public static OrderSelectedEvent Instance
{
get { return _event; }
}
public class OrderSelectedPayload
{
public string SelectedOrder { get; set; }
public string SelectedE32 { get; set; }
}
}
Publisher (In ViewModel1):
OrderSelectedEvent.OrderSelectedPayload ospl = new OrderSelectedEvent.OrderSelectedPayload();
ospl.SelectedOrder = _strCurrentOrder;
ospl.SelectedE32 = _strCurrentE32JobNumber;
OrderSelectedEvent.Instance.Publish(ospl);
Subscriber (In ViewModel2:
OrderSelectedEvent.Instance.Subscribe(OrderSelectedEventHandler);
I'm getting an error here on the subsriber: **ERROR: cannot convert from 'method group' to 'Action'**** and I can't seem to figure out what I need to do.
private void OrderSelectedEventHandler(OrderSelectedEvent.OrderSelectedPayload ospl)
{
CurrentOrder = ospl.SelectedOrder;
CurrentE32JobNumber = ospl.SelectedE32;
}
Thanks in advance for any guidance you can provide.
Your problem is simple: You are defining the event to pass an object
as payload, then trying to use a specific class as payload instead. To fix this, change
internal class OrderSelectedEvent : PubSubEvent<object>
To:
internal class OrderSelectedEvent : PubSubEvent<OrderSelectedPayload>
Alternatively, you could change your handler signature to match the expected parameters of the event:
private void OrderSelectedEventHandler(OrderSelectedEvent.OrderSelectedPayload ospl)
To:
private void OrderSelectedEventHandler(object ospl)