使用 F# 在 Web 中搜索

Question

嗨，我想搜索页面上存在的所有功能语言，每个编程语言都列在一个表格中，我使用的页面是：https://en.wikipedia.org/wiki/Comparison_of_multi-paradigm_programming_languages#Paradigm_summaries

我将在两个元组中得到结果，我用来完成这个的代码是：

#r "/usr/lib/cli/fsharp/FSharp.Data.2.4.2/lib/net45/FSharp.Data.dll"
open FSharp.Data
type Multiparadigm = HtmlProvider<"https://en.wikipedia.org/wiki/Comparison_of_multi-paradigm_programming_languages#Paradigm_summaries">
let multi =
    [ for x in Multiparadigm.GetSample().Tables.``Lenguage overview``.Rows ->
        x.Type, x.``Functional`` ]

我将它保存在一个 .fsx 文件中，当我在 ubuntu 中使用 Fsharpc 时，我得到的错误是：

/Documents/Fsharp/testF#/getDataFPage.fsx(5,43): error FS0039: The field, constructor or member 'Languaje overview' is not defined

/Documents/Fsharp/testF#/getDataFPage.fsx(6,9): error FS0072: Lookup on object of indeterminate type based on information prior to this program point. A type annotation may be needed prior to this program point to constrain the type of the object. This may allow the lookup to be resolved.

/Documents/Fsharp/testF#/getDataFPage.fsx(6,17): error FS0072: Lookup on object of indeterminate type based on information prior to this program point. A type annotation may be needed prior to this program point to constrain the type of the object. This may allow the lookup to be resolved.

我想知道我做错了什么，因为在我得到的交互式工具中：

Referenced '/usr/lib/cli/fsharp/FSharp.Data.2.4.2/lib/net45/FSharp.Data.dll' (file may be locked by F# Interactive process)

Answer 1

你有一个错字，它是 Language 不是 Lenguage 也不是 Languaje。

还要注意Type 属性不存在。

因此，如果您对代码进行这两个小的更改，它应该可以工作：

#r "/usr/lib/cli/fsharp/FSharp.Data.2.4.2/lib/net45/FSharp.Data.dll"
open FSharp.Data
type Multiparadigm = HtmlProvider<"https://en.wikipedia.org/wiki/Comparison_of_multi-paradigm_programming_languages#Paradigm_summaries">
let multi =
    [ for x in Multiparadigm.GetSample().Tables.``Language overview``.Rows ->
        x.Language,  x.``Func­tion­al`` ]

它给了你这样的东西：

type Multiparadigm = HtmlProvider<...>
val multi : (string * string) list =
  [("Ada[3][4][5][6][7]", "No"); ("ALF", "Yes");
   ("AmigaE[citation needed]", "No"); ("APL", "Yes");
   ("BETA[citation needed]", "Yes"); ("C++", "Yes"); ("C#", "Yes[a 5]");
...