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我有一些生成异常的代码，second time 它在 FSI 中执行。顺序如下：

1）选择above它的所有行，继续FSI使用Alt+Enter.

2）选择代码，FSI使用Alt+Enter. 到目前为止没有错误。

3) 通过点击再次运行选定的代码Alt+Enter。错误（见下文）。

以下是生成此行为的代码行：

let assetsMap =
    assetInfo.Rows
    |> Seq.filter (fun (rw: AssetsInfo.Row) -> Set.contains rw.Ticker assetsTickerSet)
    |> List.ofSeq
    |> List.map (fun rw -> rw.Ticker, Asset.constructor rw) // Frame.ReadCSV called here
    |> Map.ofSeq

相关资料：

type AssetsInfo = FSharp.Data.CsvProvider<...>

错误信息：

System.InvalidOperationException: tried to skip The input sequence has an insufficient number of elements. 1 past the end of the seq
   at Microsoft.FSharp.Collections.SeqModule.Skip@1316.GenerateNext(IEnumerable`1& next)
   at Microsoft.FSharp.Core.CompilerServices.GeneratedSequenceBase`1.MoveNextImpl()
   at Microsoft.FSharp.Core.CompilerServices.GeneratedSequenceBase`1.System-Collections-IEnumerator-MoveNext()
   at FSharp.Data.Runtime.CsvHelpers.parseIntoTypedRows@176.GenerateNext(IEnumerable`1& next) in C:\Git\FSharp.Data\src\Csv\CsvRuntime.fs:line 176
   at Microsoft.FSharp.Core.CompilerServices.GeneratedSequenceBase`1.MoveNextImpl()
   at Microsoft.FSharp.Core.CompilerServices.GeneratedSequenceBase`1.System-Collections-IEnumerator-MoveNext()
   at Microsoft.FSharp.Collections.Internal.IEnumerator.next@187[T](FSharpFunc`2 f, IEnumerator`1 e, FSharpRef`1 started, Unit unitVar0)
   at Microsoft.FSharp.Collections.Internal.IEnumerator.filter@182.System-Collections-IEnumerator-MoveNext()
   at Microsoft.FSharp.Collections.SeqModule.ToList[T](IEnumerable`1 source)
   at <StartupCode$FSI_0035>.$FSI_0035.main@() in H:\Dropbox\BitBucket\VSProjects\Fractal10\Fractal10\Program.fs:line 139
Stopped due to error

关于这种奇怪行为的原因有什么想法吗？

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0 回答 0