Windows应用商店应用程序和F# [英] Windows Store Apps and F#

问题描述

我正在尝试使用F#创建可移植的库以用于Windows Store应用程序.我用一个类创建了一个fs文件:

I am trying to create a portable library using F# to use with Windows Store apps. I created one fs file with one class:

module FunctionalRT

open System.Net
open System.IO

type WebHelper =

    static member DownloadStringAsync (url:string) = async {
        let req = HttpWebRequest.Create(url)
        use! resp = req.AsyncGetResponse()
        use stream = resp.GetResponseStream()
        let reader = new StreamReader(stream) 
        let s = reader.ReadToEnd()
        return s
    }

我在Windows Store应用程序中毫无问题地引用了该库.但是问题是，我不能访问FunctionalRT模块，也不能访问WebHelper类.当我编写using FunctionalRT或尝试使用FunctionalRT.WebHelper.FunctionalRT时，编译器会抱怨它不知道.可能是什么问题?

I referenced this library in my Windows Store app with no problems. But the problem is, I cannot access the FunctionalRT module neither the WebHelper class. When I write using FunctionalRT or try to use FunctionalRT.WebHelper.FunctionalRT, the compiler complains it does not know it. What may be the problem?

经过几次清洗和清理后，我得到了

After a few buidls and cleans I get

The type 'Microsoft.FSharp.Control.FSharpAsync`1<T0>' is defined in an assembly that is not referenced. You must add a reference to assembly 'FSharp.Core, Version=2.3.5.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.  C:\Users\Igor\Documents\Visual Studio 2012\Projects\App3\App3\GroupedItemsPage.xaml.cs  46  13  App3

添加对C:\Program Files (x86)\MSBuild\..\Reference Assemblies\Microsoft\FSharp\3.0\Runtime\.NETPortable\FSharp.Core.dll的引用解决了上述错误消息，但还有一个错误提示

Adding a reference to C:\Program Files (x86)\MSBuild\..\Reference Assemblies\Microsoft\FSharp\3.0\Runtime\.NETPortable\FSharp.Core.dll solved the above error message, but there is another one

Cannot await 'Microsoft.FSharp.Control.FSharpAsync<string>'

推荐答案

您必须在Windows Store应用中引用此库才能使其正常工作:

You have to reference this library in your Windows Store app to make it work:

C:\ Program Files(x86)\ Reference 程序集\ Microsoft \ FSharp \ 3.0 \ Runtime.NETPortable \ FSharp.Core.dll

C:\Program Files (x86)\Reference Assemblies\Microsoft\FSharp\3.0\Runtime.NETPortable\FSharp.Core.dll

关于该FSharpAsync类，请参见以下线程:
从C#中引用异步F#数据类型

And regarding that FSharpAsync class, see this thread:
Referencing Asynchronous F# datatype from C#

您可以使用FSharpAsync类型的静态方法来等待返回的对象.

You could use static method of the FSharpAsync type for awaiting the returned object.

这篇关于Windows应用商店应用程序和F#的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！