嗨，我在 F# 上有这段代码，如果我从 F# 交互式编辑器中对其进行测试，isPalindrome 和 Extract 方法都可以正常工作：
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
我从这样的 C# 控制台应用程序调用此代码：
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，我也在这个项目上下载了 FSharp.Data 和 FSharp.Core。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：
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)'.
知道发生了什么吗？我在互联网上搜索，但没有找到任何相关的东西。谢谢！