F# 静态成员

Question

我正在浏览 PDC 2008 F# 视频，但似乎遇到了问题

type StockAnalyzer (lprices, days) =
let prices =
    lprices
    |> Seq.map snd
    |> Seq.take days
 static member GetAnalyzers(tickers, days) = 
    tickers
    |> Seq.map loadPrices
    |> Seq.map (fun prices -> new StockAnalyzer(prices, days))

 member s.Return = 
    let lastPrice = prices |> Seq.nth 0
    let startPrice = prices |> Seq.nth (days - 1)
    lastPrice / startPrice - 1.

我在静态时遇到错误。

GetStockPrices.fs(31,6): error FS0010: Unexpected keyword 'static' in binding. Expected incomplete structured construct at or before this point or other token.

有谁知道他们是否更改了语法或可以发现我做错了什么

Answer 1

F# 使用大量空白。在“让价格=”前加一个空格。编译器试图弄清楚为什么你有一个“价格”的静态成员，因为唯一缩进较少的前一行是“让价格=”。

您可能想要使用更多的缩进，只是为了清楚起见。

type StockAnalyzer (lprices, days) =
   let prices =
      lprices
      |> Seq.map snd
      |> Seq.take days

   static member GetAnalyzers(tickers, days) = 
      tickers
      |> Seq.map loadPrices
      |> Seq.map (fun prices -> new StockAnalyzer(prices, days))

   member s.Return = 
      let lastPrice = prices |> Seq.nth 0
      let startPrice = prices |> Seq.nth (days - 1)
      lastPrice / startPrice - 1.