从C#调用Freebase Provider时FSharp.Data'System.MissingMethodException' [英] FSharp.Data 'System.MissingMethodException' when calling Freebase Provider from C#

问题描述

我在F#上有这段代码，如果我从F#交互式编辑器对其进行测试，则isPalindrome和Extract方法都可以很好地工作:

Hi I have this piece of code on F#, if I test it from the F# Interactive Editor both isPalindrome and Extract methods work well:

namespace Portable3
open FSharp
open FSharp.Data
open Microsoft.FSharp.Linq 
open FSharp.Data.FreebaseOperators
open MyTrip.Model.MyTrip
open MyTrip.Model.FreeBase
open System.Runtime
open System.Linq

module math = 
let isPalindrome (str : string) = 
 let rec check(s : int, e : int) =
    if s = e then true
    elif str.[s] <> str.[e] then false
    else check(s + 1, e - 1)
 check(0, str.Length - 1)

 [<AutoOpen>]
 module Extractor =

[<Literal>] 
let FreebaseApiKey = "AIzaSyCO31Ls"
type FreebaseDataWithKey = FreebaseDataProvider<Key=FreebaseApiKey>

let Extract mid = let dataWithKey = FreebaseDataWithKey.GetDataContext()
                  let place = dataWithKey.Commons.Travel.``Travel destinations``.Where( fun x-> x.MachineId = mid) |> Seq.toList                           
                  let result = new Place()   
                  let firstPlace = place.Head
                  result.Name <- firstPlace.Name                      
                  result

我从C#控制台应用程序调用此代码，如下所示:

And I call this code from a C# Console app like this:

 class Program
{
    static void Main(string[] args)
    {
        //Works well
        var isPalin = math.isPalindrome("ABsBA");
        //fails
        var res = Extractor.Extract("/m/04jpl");
        Console.WriteLine(res);
        Console.Read();

    }
}

控制台C#项目是.net Framework 4.5.1版本，我也在该项目上下载了FSharp.Data和FSharp.Core.当执行isPalindrome时效果很好，但是当我要执行Extract方法时，会出现此错误:

The console C# project is .net Framework 4.5.1 version, I downloaded the FSharp.Data and FSharp.Core on this project also. When executing isPalindrome works well but when I'm about to execute the Extract method this error appears:

An unhandled exception of type 'System.MissingMethodException' occurred in FsharpConsoleTest.exe

Additional information: Method not found: 'FSharp.Data.Runtime.Freebase.FreebaseDataContext   FSharp.Data.Runtime.Freebase.FreebaseDataContext._Create(System.String, System.String, System.Boolean, System.String, System.Boolean, System.Boolean)'.

有什么想法吗?我在互联网上搜索，但没有发现任何相关信息.谢谢！

Any idea on what's happening? I searched on internet but didn't found anything relevant. Thanks!

推荐答案

最后，问题是使用带有FSharp.Data的可移植库.我尝试在普通的F#库中使用它，但没有发现任何问题，我具有所有调试功能，并且没有发生c#与f#集成的错误！

The problem at the end was using a portable library with FSharp.Data. I tried using it in a normal F# library and I found no problems, I had all the debuggin capabilities, and no errors from c# integration with f# are happening!

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