我可以使用Microsoft Dotnet CLI构建ASP.NET Core Web应用程序吗？

Question

I have gone through some websites and found that .NET Core is using .NET CLI (.NET Command Line Interface). I have create a console application using .NET CLI and it is working fine

But when I am creating an ASP.NET Core web application using Yeoman and running the command “dotnet restore” then I am getting the following error:

Microsoft.CodeAnalysis.CSharp 1.1.0-rc1-20151109-01 is not compatible with DNXCore,Version=v5.0.

I also tried

dotnet restore -s https://api.nuget.org/v3/index.json

But getting the same error.

If I run “dnu restore” then it is working fine so my question is can I use .NET CLI for web application too or it is only limited to console application?

I have gone through the links

https://github.com/dotnet/cli & http://dotnet.github.io/getting-started/

but did not find any details that it supports ASP.NET Core web app or not?

Answer 1

I've spent a good hour on toying around with it and I got the "Welcome page" running with it.

As I suspected, you tried to use dotnet-cli with your dnx styled project and you you used the wrong nuget feed (the official one, rather than the nightly myget feeds).

For this demo project, just create a new folder and run dotnet new . This creates three files: NuGet.Config , project.json and Program.cs . You can delete the later one and just create a Startup.cs from below.

Startup.cs:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;

namespace AspNetCoreCliDemo
{
    public class Startup
    {
        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit http://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app)
        {
            app.UseIISPlatformHandler();
            app.UseWelcomePage();
        }

        // This doesn't work right now, as it can't resolve WebApplication type
        //public static void Main(string[] args) => WebApplication.Run<Startup>(args);

        // Entry point for the application.
        public static void Main(string[] args)
        {
            var host = new WebHostBuilder()
                        .UseDefaultConfiguration(args)
                        .UseServer("Microsoft.AspNetCore.Server.Kestrel")
                        .UseIISPlatformHandlerUrl()
                        .UseStartup<Startup>()
                        .Build();

            host.Run();
        }
    }
}

project.json:

{
  "version": "1.0.0-*",
  "compilationOptions": {
    "emitEntryPoint": true
  },

  "dependencies": {
    "NETStandard.Library": "1.0.0-rc2-*",
    "Microsoft.AspNetCore.Diagnostics": "1.0.0-rc2-*",
    "Microsoft.AspNetCore.IISPlatformHandler": "1.0.0-rc2-*",
    "Microsoft.AspNetCore.Server.Kestrel": "1.0.0-rc2-*"
  },

  "frameworks": {
    "dnxcore50": { }
  },

  "exclude": [
    "wwwroot",
    "node_modules"
  ],
  "publishExclude": [
    "**.user",
    "**.vspscc"
  ]
}

Note: Only dnxcore moniker is supported as of now.

Last but not least, the NuGet.Config that worked in my case:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <packageSources>
    <!--To inherit the global NuGet package sources remove the <clear/> line below -->
    <clear />
    <add key="cli-deps" value="https://dotnet.myget.org/F/cli-deps/api/v3/index.json" />
    <add key="dotnet-core" value="https://dotnet.myget.org/F/dotnet-core/api/v3/index.json" />
    <add key="api.nuget.org" value="https://api.nuget.org/v3/index.json" />
  </packageSources>
</configuration>

I didn't had the success with the two default feeds (api.nuget.org and dotnet-core) as it couldn't resolve a few dependencies. After adding the "cli-deps" feed, all packages were resolved and dotnet run worked. It will listen on the " http://localhost:5000 " port and serve the welcome page.

You may get an error message about having more than one entry point, that's because you got a Main method in both Program.cs and Startup.cs . Just delete the Program.cs .

This should serve as an entry point.

dotnet-cli as of now doesn't support commands yet (ones formerly defined in the project.json file).

Answer 2

Short Answer

For ASP.NET Core rc1, we use dnx and dnu .

For ASP.NET Core rc2, we use dotnet.

Longer Answer

I have gone through some websites and found that .NET Core is using .NET CLI (.NET Command Line Interface). I have create a console application using .NET CLI and it is working fine.

ASP.NET Core rc2 is also a console application. That is, it is a console application that starts the ASP.NET hosting layer.

But when I am creating an ASP.NET Core web application using Yeoman and running the command “dotnet restore” then I am getting the following error...

My sense is that you are running these commands:

yo aspnet
? What type of application do you want to create? Web Application
? What's the name of your ASP.NET application? MyApp

This creates an ASP.NET Core rc1 project. You can see this by looking at the resultant project.json file dependencies. They all say rc1-final . Result: you cannot build these with the dotnet command line. You still have to use the dnu build and the dnx <command> formulas.

...can I use .NET CLI for web application[s] too or it is only limited to console application?

In ASP.NET Core rc1, the dnx.exe made a call to new WebHostBuilder() , so we need to use dnx to start our web application. In ASP.NET Core rc2, the console application that contains our web app makes its own call to new WebHostBuilder() , so we can use the dotnet command line interface to start the app. So...

• No you cannot use the dotnet CLI for ASP.NET Core rc1 Web Applications, because dnx.exe loads the ASP.NET Hosting Layer.
• Yes you can use it for ASP.NET Core rc2 Web Applications, because your console application loads the ASP.NET Hosting Layer itself.

Answer 3

Now I don't know what your exact error is, but this might be helpful:

Basically, you need to add the appropriate imports to your project.json:

    "frameworks": {
        "dnxcore50": { 
            "imports": "portable-net451+win8"
        }
    }

(As posted here: https://github.com/aspnet/Home/issues/1265 )

These were my errors:

Errors in /webserver/project.json
    Package Microsoft.CodeAnalysis.CSharp 1.1.0-rc1-20151109-01 is not compatible with dnxcore50 (DNXCore,Version=v5.0). Package Microsoft.CodeAnalysis.CSharp 1.1.0-rc1-20151109-01 supports:
      - net45 (.NETFramework,Version=v4.5)
      - portable-net45+win8 (.NETPortable,Version=v0.0,Profile=Profile7)
    Package Microsoft.CodeAnalysis.Common 1.1.0-rc1-20151109-01 is not compatible with dnxcore50 (DNXCore,Version=v5.0). Package Microsoft.CodeAnalysis.Common 1.1.0-rc1-20151109-01 supports:
      - net45 (.NETFramework,Version=v4.5)
      - portable-net45+win8 (.NETPortable,Version=v0.0,Profile=Profile7)
    One or more packages are incompatible with DNXCore,Version=v5.0.

I generated the .Net Web App using the Swagger Code generator from http://editor.swagger.io/#/

After adding the imports, dotnet restore worked without problems.