什么是F＃等效的C＃“公共事件” [英] What is F# equivalent of C# "public event "

问题描述

我正在尝试从这篇文章翻译成F＃代码 http://www.codeproject.com/Articles/35532/C-COM-Object-for-Use-In-JavaScript-HTML-包含

I'm trying to translate to F# code from this article http://www.codeproject.com/Articles/35532/C-COM-Object-for-Use-In-JavaScript-HTML-Including

我绊倒了这一行：

public delegate void MyFirstEventHandler(string args);
public event MyFirstEventHandler MyFirstEvent;

我已经尝试在F＃中翻译：

I've tried to translate this in F# as:

type MyFirstEventHandler = delegate of string -> unit
type MyFsComComponent () = 
    let my_event = new Event<MyFirstEventHandler,string> ()

    [<CLIEvent>]
    member x.MyFirstEvent = my_event.Publish

我得到：'MyFirstEventHandler'有一个非标准委托

我可以用：

type MyFirstEventHandler = delegate of obj*string -> unit

但这不是COM控件中需要的。

But this is not what needed in COM-control.

此问题也在 C＃到F＃类转换中引发 - 公共事件仍然没有解决方案

This question is also raised in C# to F# class transition - "public event" still did not have solution

SOLVED。感谢Leaf Garland

type MyFirstEventHandler = delegate of string -> unit
type MyFsComComponent () =    
    let my_event = new DelegateEvent<MyFirstEventHandler> ()

    [<CLIEvent>]
    member x.MyFirstEvent = my_event.Publish

做的伎俩。

推荐答案

F＃事件类期望参数类型作为通用参数，而不是委托类型。它也期望代表是一种标准类型（例如像 obj * eventargs-> unit ）。对于任意代理使用DelegateEvent。

The F# Event class expects the argument types as generic parameters, not the delegate type. It also expects that the delegate is a standard type (e.g. something like obj*eventargs->unit). For arbitrary delegates use DelegateEvent.

type MyFirstEventHandler = delegate of string -> unit
type MyFsComComponent () = 
    let my_event = new DelegateEvent<MyFirstEventHandler>()

    [<CLIEvent>]
    member x.MyFirstEvent = my_event.Publish

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