在F＃模块中定义的两种类型，但只有一种在C＃中可见

Question

I have an F# library where I defined a module. Inside the module there are 2 types defined. I'm accessing the library from C# project (currently it's only a test project though that probably doesn't matter).

I can access one of the types from C# but the other one is not available.

Below my F# code:

module Stock

open FSharp.Data
open InstrumentQueryBuilder

type Stock = CsvProvider<"..\prototype_historical_data.csv">

type StockData(symbol) = 
    member this.Symbol = symbol
    member private this.QueryBuilder = new InstrumentQueryBuilder(this.Symbol)
    member this.LoadData() =
        this.QueryBuilder.HistoricalData() |> Stock.Load
    // more member definitions here...

From C# I can see StockData but not Stock . Stock is CsvProvider from FSharp.Data. In my C# code I'm referencing both FSharp.Data and FSharp.Core.

Using StockData in C# is as simple as this:

var stockData = new Stock.StockData("SPY");

But if I do the same for Stock it shows a compile time error. Any suggestion how to access the Stock type or an explanation why that's not possible?

Answer 1

In F#, type has lot of meaning to it even though they all look very similar.

In you case,

Stock - Type abbreviation (alias). Not a first class object. Thats why it is not visible to c#.

StockData - It is class. Has function-style parameter list after name for use as constructor.