F# ASP.net MVC 项目无法在 VS 2019 中编译

Question

我一直在重温我的一个旧实验。下面的代码是我添加到 Daniel Mohl's F# MVC5 project 的文件，我在 Visual Studio 2015 年创建了它。它在 VS2015 中编译和工作（现在仍然如此）但是当我尝试在 VS2019 中编译它时，我收到一条错误消息在接近尾声的 |> this.View 行：“FS0405：调用了一个受保护的成员或正在使用 'base'。这只允许在成员的直接实现中使用，因为它们可以逃脱其对象范围”。有谁知道我需要做什么来消除错误

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

Answer 1

我认为这里的问题在于 View 是一个受保护的方法，这意味着您可以直接从派生的 class 中调用它，但您不能将其视为第一个- class F# 函数。

因此，要修复编译器错误，请尝试将 model |> this.View 更改为 this.View(model)。

F# ASP.net MVC 项目无法在 VS 2019 中编译

F# ASP.net MVC Project won't compile in VS 2019

asp.net-mvc

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