F# 利用TypeProvider时，如何删除重复的字符串值？

利用TypeProvider时，如何删除重复的字符串值

我有以下逻辑：

type MovieProvider = JsonProvider<"https://facebook.github.io/react-native/movies.json">

let getMovies() =

    async {
      let! result = MovieProvider.AsyncLoad "https://facebook.github.io/react-native/movies.json" 
      return result.Movies 
             |> Array.toList
             |> List.map (fun m -> { Title=m.Title; Year=m.ReleaseYear }) 
    }

let url = "https://facebook.github.io/react-native/movies.json"

type MovieProvider = JsonProvider<url>

let getMovies() =

    async {
      let! result = MovieProvider.AsyncLoad url
      return result.Movies 
             |> Array.toList
             |> List.map (fun m -> { Title=m.Title; Year=m.ReleaseYear }) 
    }

type MovieProvider = JsonProvider<url>

type MovieProvider=JsonProvider
让我们一起看电影吧=
异步的{
让！result=MovieProvider.AsyncLoad“https://facebook.github.io/react-native/movies.json" 
返回结果。电影
|>数组.toList
|>List.map（fun m->{Title=m.Title；Year=m.ReleaseYear}）
}

我想通过执行以下操作删除硬编码URL的重复：

type MovieProvider = JsonProvider<"https://facebook.github.io/react-native/movies.json">

let getMovies() =

    async {
      let! result = MovieProvider.AsyncLoad "https://facebook.github.io/react-native/movies.json" 
      return result.Movies 
             |> Array.toList
             |> List.map (fun m -> { Title=m.Title; Year=m.ReleaseYear }) 
    }

let url = "https://facebook.github.io/react-native/movies.json"

type MovieProvider = JsonProvider<url>

let getMovies() =

    async {
      let! result = MovieProvider.AsyncLoad url
      return result.Movies 
             |> Array.toList
             |> List.map (fun m -> { Title=m.Title; Year=m.ReleaseYear }) 
    }

type MovieProvider = JsonProvider<url>

let url=”https://facebook.github.io/react-native/movies.json"
键入MovieProvider=JsonProvider
让我们一起看电影吧=
异步的{
let！result=MovieProvider.AsyncLoad url
返回结果。电影
|>数组.toList
|>List.map（fun m->{Title=m.Title；Year=m.ReleaseYear}）
}

但是，我收到以下错误：

type MovieProvider = JsonProvider<"https://facebook.github.io/react-native/movies.json">

let getMovies() =

    async {
      let! result = MovieProvider.AsyncLoad "https://facebook.github.io/react-native/movies.json" 
      return result.Movies 
             |> Array.toList
             |> List.map (fun m -> { Title=m.Title; Year=m.ReleaseYear }) 
    }

let url = "https://facebook.github.io/react-native/movies.json"

type MovieProvider = JsonProvider<url>

let getMovies() =

    async {
      let! result = MovieProvider.AsyncLoad url
      return result.Movies 
             |> Array.toList
             |> List.map (fun m -> { Title=m.Title; Year=m.ReleaseYear }) 
    }

type MovieProvider = JsonProvider<url>

type MovieProvider=JsonProvider

错误这不是有效的常量表达式或自定义属性 价值观

摘要

那么，在F#中，管理硬编码值复制的推荐做法是什么

---

在C#中，我只声明一个常量。

要在F#中声明一个值文字作为编译时常量，请使用

[]

属性

[<Literal>]
let url = "https://facebook.github.io/react-native/movies.json"

[]
让url=”https://facebook.github.io/react-native/movies.json"

或同等地

let [<Literal>] url = "https://facebook.github.io/react-native/movies.json"

let[]url=”https://facebook.github.io/react-native/movies.json"

要在F#中将值文字声明为编译时常量，请使用

[]

属性

[<Literal>]
let url = "https://facebook.github.io/react-native/movies.json"

[]
let url=”https://facebook.github.io/react-native/movies.json"

或同等地

let [<Literal>] url = "https://facebook.github.io/react-native/movies.json"

let[]url=”https://facebook.github.io/react-native/movies.json"

为此，请使用

MovieProvider.GetSample（）

。这就是它的用途。为此，请使用

MovieProvider.GetSample（）

。这就是它的目的。