ASP.NET Core 1.0 F# 项目

Question

有人可以分享用 F# 编写的最小工作 ASP.NET Core 应用程序项目吗？

要在 C# 中实现一个最小的演示，我们必须执行以下操作：

mkdir aspnetcoreapp
cd aspnetcoreapp
dotnet new

然后编辑project.json:

{
  "version": "1.0.0-*",
  "buildOptions": {
    "debugType": "portable",
    "emitEntryPoint": true
  },
  "dependencies": {},
  "frameworks": {
    "netcoreapp1.0": {
      "dependencies": {
        "Microsoft.NETCore.App": {
          "type": "platform",
          "version": "1.0.0"
        },
        "Microsoft.AspNetCore.Server.Kestrel": "1.0.0"
      },
      "imports": "dnxcore50"
    }
  }
}

然后执行dotnet restore并使用以下代码：

Startup.cs:

using System;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;

namespace aspnetcoreapp
{
    public class Startup
    {
        public void Configure(IApplicationBuilder app)
        {
            app.Run(context =>
            {
                return context.Response.WriteAsync("Hello from ASP.NET Core!");
            });
        }
    }
}

Program.cs:

using System;
using Microsoft.AspNetCore.Hosting;

namespace aspnetcoreapp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var host = new WebHostBuilder()
                .UseKestrel()
                .UseStartup<Startup>()
                .Build();

            host.Run();
        }
    }
}

然后执行dotnet run。谁能给我一个提示如何在 F# 中做同样的事情？

Answer 1

我想你要找的是--lang switch。

因此，获得基础 F# 项目的唯一更改是：

dotnet new --lang fsharp

然后，您可以按照 Pavel 对实际 ASP.NET 逻辑的回答。

编辑：

顺便说一句，fsharp也可以替换成f#和fs，正如PR中提到的那样。

还有另一个issue，它建议对dotnet new 进行更改以允许使用模板。

编辑 2：

新工具支持更多模板：

Templates                                 Short Name      Language      Tags
--------------------------------------------------------------------------------------
Console Application                       console         [C#], F#      Common/Console
Class library                             classlib        [C#], F#      Common/Library
Unit Test Project                         mstest          [C#], F#      Test/MSTest
xUnit Test Project                        xunit           [C#], F#      Test/xUnit
Empty ASP.NET Core Web Application        web             [C#]          Web/Empty
MVC ASP.NET Core Web Application          mvc             [C#], F#      Web/MVC
Web API ASP.NET Core Web Application      webapi          [C#]          Web/WebAPI
Solution File                             sln                           Solution

使用示例：

X:\>dotnet new mvc -n MyFsharpProject -lang F#
Content generation time: 309.5706 ms
The template "MVC ASP.NET Core Web Application" created successfully.

Answer 2

我最近一直在探索新的 .net 核心并面临同样的问题。实际上，这很容易做到。

将 F# 运行时引用添加到您的 project.json：

{
  "version": "1.0.0-*",
  "buildOptions": {
    "emitEntryPoint": true,
    "compilerName": "fsc",
    "compile": "**/*.fs"
  },
  "dependencies": {
    "Microsoft.FSharp.Core.netcore": "1.0.0-alpha-160509",
    "Microsoft.AspNetCore.Server.Kestrel": "1.0.0"
  },
  "tools": {
    "dotnet-compile-fsc": {
      "version": "1.0.0-preview2-*",
      "imports": [
        "dnxcore50",
        "portable-net45+win81",
        "netstandard1.3"
      ]
    }
  },
  "frameworks": {
    "netcoreapp1.0": {
      "dependencies": {
        "Microsoft.NETCore.App": {
          "type": "platform",
          "version": "1.0.0"
        }
      },
      "imports": [
        "portable-net45+win8",
        "dnxcore50"
      ]
    }
  }
}

然后将下面的代码放入您的Program.fs：

open System
open Microsoft.AspNetCore.Hosting
open Microsoft.AspNetCore.Builder
open Microsoft.AspNetCore.Hosting
open Microsoft.AspNetCore.Http


type Startup() = 
    member this.Configure(app: IApplicationBuilder) =
      app.Run(fun context -> context.Response.WriteAsync("Hello from ASP.NET Core!"))


[<EntryPoint>]
let main argv = 
    let host = WebHostBuilder().UseKestrel().UseStartup<Startup>().Build()
    host.Run()
    printfn "Server finished!"
    0

顺便说一句，定义您的 Startup 类非常重要，例如 type Startup() 而不是 type Startup。否则 Kestrel 运行时会在启动时崩溃。