The `ProcessDataOccurred` event of my `IProcessDataPublisher` resource is not processed

Question

I have a resources in my application which inherit from SomeCellBase, which implements the IProcessDataPublisher interface as shown below

[ResourceRegistration]
public abstract class SomeCellBase : Cell, IProcessDataPublisher
{
    protected virtual void OnProcessDataOccured(Measurement measurement)
    {
        ProcessDataOccurred?.Invoke(this, measurement);
    }

    public event EventHandler<Measurement> ProcessDataOccurred;
}

I also have a reference to the Moryx.ProcessData.Adapter.ResourceManagement package in my application.

However the ProcessDataOccurred EventHandler is always null, as if the resource would not have been registered by the adapter.

Answer 1

Through the facade of the ResourceManagement you don't receive your original object, but instead a runtime generated proxy with the same public resource interfaces.

For that the ProxyGenerator only searches for interfaces derived from IResource to avoid accidently publishing access to IDisposable for example. Any non resources interfaces that should also be visible, must be exported using the ResourceAvailabeAsAttribute

In your case:

[ResourceRegistration, ResourceAvailableAs(typeof(IProcessDataPublisher))]
public abstract class SomeCellBase : Cell, IProcessDataPublisher
{
    protected virtual void OnProcessDataOccured(Measurement measurement)
    {
        ProcessDataOccurred?.Invoke(this, measurement);
    }

    public event EventHandler<Measurement> ProcessDataOccurred;
}