我正在从F#向C#发布一个事件：
- let event = new DelegateEvent<EventHandler>()
- member x.Ping() = event.Trigger([| x; EventArgs.Empty |])
- [<CLIEvent>]
- member x.PingEvent = event.Publish
但是,我希望在处理程序被添加或删除时运行一些代码.我认为这可以在C#中这样做：
- public event EventHandler PingEvent
- {
- add
- {
- //do something
- }
- remove
- {
- //do something
- }
- }
如何在F#中写上面的内容？
解决方法
在F#中,您可以使用IDelegateEvent< _>接口(或从其导出的IEvent …或IEvent,_,_>接口).所以你可以这样做：
- let customEvent add remove =
- { new IDelegateEvent<_> with
- member this.AddHandler del = add del
- member this.RemoveHandler del = remove del }
- type MyType() =
- let ev = customEvent (* your add handler *) (* your remove handler *)
- [<CLIEvent>]
- member this.myEvent = ev
