How to translate C# events to Delphi

Question

I am porting some kind of code from Visual Studio to Delphi 10.

Wondering how we should translate the following construct:

public event PreviewReadyDelegate PreviewReady
    {
        add     { Scheduler.AddOrRemoveEvent(() => { _previewReady += value; }); }
        remove  { Scheduler.AddOrRemoveEvent(() => { _previewReady -= value; }); }
    }

Help appreciated.

Answer 1

C# events are multicast delegates. There is no equivalent construct in the Delphi language. You would need to implement your own multicast mechanism or use an existing one from a third party library, for instance that found in spring4d.