无法找到类型或命名空间名称'WebHostBuilder'

Question

我已经创建了空的asp.net核心项目，我想在那里建立角度。为此，我需要应用程序来提供静态文件。所以我Startup.cs样子：

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; 
using Microsoft.Extensions.Logging; 

namespace coreng 
{ 
    public class Startup 
    { 
     public void Configure(IApplicationBuilder app) 
     { 
      app.UseDefaultFiles(); 
      app.UseStaticFiles(); 
     } 
    } 
} 

的Program.cs

using System; 
using System.Collections.Generic; 
using System.IO; 
using System.Linq; 
using System.Threading.Tasks; 
using Microsoft.AspNetCore.Hosting; 

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

      host.Run(); 
     } 
    } 
} 

，并有我的project.json

{ 
    "dependencies": { 
    "Microsoft.NETCore.App": { 
     "version": "1.0.0", 
     "type": "platform" 
    }, 
    "Microsoft.AspNetCore.Diagnostics": "1.0.0", 
    "Microsoft.Extensions.Logging.Console": "1.0.0", 
    "Microsoft.AspNet.IISPlatformHandler": "1.0.0-rc1-final", 
    "Microsoft.AspNet.Server.Kestrel": "1.0.0-rc1-final", 
    "Microsoft.AspNet.StaticFiles": "1.0.0-rc1-final", 
    "Microsoft.AspNetCore.StaticFiles": "1.0.0" 
    }, 

    "tools": { 
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final" 
    }, 

    "frameworks": { 
    "netcoreapp1.0": { 
     "imports": [ 
     "dotnet5.6", 
     "portable-net45+win8" 
     ] 
    } 
    }, 

    "buildOptions": { 
    "emitEntryPoint": true, 
    "preserveCompilationContext": true 
    }, 

    "runtimeOptions": { 
    "configProperties": { 
     "System.GC.Server": true 
    } 
    }, 

    "publishOptions": { 
    "include": [ 
     "wwwroot", 
     "web.config" 
    ] 
    }, 

    "scripts": { 
    "postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ] 
    } 
} 

但它抛出一个错误：

Severity Code Description Project File Line Suppression State Error CS0246 The type or namespace name 'WebHostBuilder' could not be found (are you missing a using directive or an assembly reference?) coreng..NETCoreApp,Version=v1.0

C:\Users\username\Documents\Visual Studio 2015\Projects\coreng\src\coreng\Program.cs 14 Active

怎么了？

Answer 1

你在混合aspnet和aspnetcore包。你也混合使用1.0和1.0RC1 vercions。

这是一个默认project.json创建一个asp.net核心网项目（网页API模板）时，你可以得到：

//... 
}, 
"Microsoft.AspNetCore.Mvc": "1.0.0", 
"Microsoft.AspNetCore.Server.IISIntegration": "1.0.0", 
"Microsoft.AspNetCore.Server.Kestrel": "1.0.0", 
"Microsoft.AspNetCore.StaticFiles": "1.0.0", 
"Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0", 
"Microsoft.Extensions.Configuration.FileExtensions": "1.0.0", 
"Microsoft.Extensions.Configuration.Json": "1.0.0", 
"Microsoft.Extensions.Logging": "1.0.0", 
"Microsoft.Extensions.Logging.Console": "1.0.0", 
"Microsoft.Extensions.Logging.Debug": "1.0.0", 
"Microsoft.Extensions.Options.ConfigurationExtensions": "1.0.0" 
}, 
//...