F＃ASP.net MVC项目无法在VS 2019中编译

我一直在回顾我的一个旧实验。下面的代码添加到文件I丹尼尔·莫尔的F＃MVC5项目，我在Visual Studio 2015中创建它编译于VS2015工作（现在仍然如此），但是当我尝试编译它VS2019我得到了一个错误信息|> this.View系到最后：“ FS0405：调用了受保护的成员或正在使用'base'。仅在成员的直接实现中才允许这样做，因为它们可以逃避其对象范围”。有谁知道我需要做些什么来摆脱错误

namespace fsmvcproject.Models

open System
open System.ComponentModel.DataAnnotations

type Newarticle() = 
    [<Key>]member val Id  = 0 with get, set
    member val Headline = "" with get, set
    member val Author = "" with get, set
    member val Publication = "" with get, set
    member val Intro = "" with get, set
    member val Story = "" with get, set

namespace fsmvcproject.Repositories

open System.Data.Entity
open fsmvcproject.Models
open System.Collections.Generic

type SGdbEntities() = 
    
    inherit DbContext("Data Source=127.0.0.1\SQLEXPRESS;Persist Security Info=True;Initial Catalog=SG;User ID=xxxx;Password=xxxx")
    
    [<DefaultValue()>] val mutable newarticles : IDbSet<Newarticle>
    member x.Newarticles with get() = x.newarticles and set v = x.newarticles <- v    

type NewarticlesRepository() =  
    
    
    member x.GetAll () = 

        use context = new SGdbEntities()    
        query { for a in context.Newarticles do
                sortByDescending a.Id
                select a }
        |> Seq.toList
    
    member x.GetDetail (id) =
        
        use context = new SGdbEntities()         
        query { for a in context.Newarticles do
                where (a.Id = id)
                select a }
        |> Seq.toList

    
namespace fsmvcproject.Controllers

open fsmvcproject.Repositories
open System.Web.Mvc

[<HandleError>]
type ArticlesController(repository :NewarticlesRepository) =
    inherit Controller()
    new() = new ArticlesController(NewarticlesRepository())
    
    member this.Index () =
        repository.GetAll()
        |> this.View

    member this.Detail (id) =
        repository.GetDetail(id)
        |> this.View