使用ConfigurationBuilder设置基本路径

Question

我正在尝试为我正在构建的.Net Web应用程序设置应用程序基本路径.我一直在配置构建器上遇到错误.这是我得到的错误.

DNX,Version=v4.5.1 error CS1061: 'ConfigurationBuilder' does not contain a definition for 'SetBasePath' and no extension method 'SetBasePath' accepting a first argument of type 'ConfigurationBuilder' could be found (are you missing a using directive or an assembly reference?)

我假设我会得到同样的错误我.AddJsonFile()和.AddEnvironmentVariables().我做错什么了吗？我没有为project.json添加正确的依赖项吗？我附上了我的startup.cs和我的project.json.

project.json

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

"dependencies": {
  "Microsoft.AspNet.StaticFiles":  "1.0.0-rc1-final",
  "Microsoft.AspNet.Server.Kestrel": "1.0.0-rc1-final",
  "Microsoft.AspNet.Mvc": "6.0.0-rc1-final",
  "Microsoft.AspNet.Mvc.TagHelpers": "6.0.0-rc1-final",
  "Microsoft.Framework.Configuration": "1.0.0-beta8",
  "Microsoft.Framework.DependencyInjection": "1.0.0-beta8"
  //"Microsoft.Extensions.PlatformAbstractions": "1.0.0-beta8"
},

"commands": {
  "web": "Microsoft.AspNet.Server.Kestrel"
},

"frameworks": {
  "dnx451": { },
  "dnxcore50": { }
},

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

startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNet.Builder;
using Microsoft.AspNet.Hosting;
using Microsoft.AspNet.Http;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.PlatformAbstractions;
using Microsoft.Framework.Configuration;
using Microsoft.Framework.DependencyInjection;
using TripPlanner.Services;



namespace TripPlanner
{
  public class Startup
  {
    public static IConfigurationRoot Configuration;

    public Startup(IApplicationEnvironment appEnv){
        var builder = new ConfigurationBuilder()
            .SetBasePath(appEnv.ApplicationBasePath)
            .AddJsonFile("config.json")
            .AddEnvironmentVariables();

        Configuration = builder.Build();
    }

    // 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(Microsoft.Extensions.DependencyInjection.IServiceCollection services)
    {
        services.AddMvc();
        #if DEBUG
        services.AddScoped<IMailService, DebugMailService> ();
        #else
        services.AddScoped<IMailService, RealMailService> ();
        #endif
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app)
    {
       //app.UseDefaultFiles();
       app.UseStaticFiles();
       app.UseMvc(config =>
       {
           config.MapRoute(
               name: "Default",
               template: "{controller}/{action}/{id?}",
               defaults: new { controller  = "App", action = "Index"}
           );
       });

    }

    // Entry point for the application.
    public static void Main(string[] args) => Microsoft.AspNet.Hosting.WebApplication.Run<Startup>(args);
  }
}

错误发生在public startupstartup.cs顶部附近的函数中.

Answer 1

我能够解决这个问题.如果您还没有解决它,请在project.json中尝试以下操作.添加以下内容:

"Microsoft.Extensions.Configuration.FileExtensions": "1.0.0-*",
"Microsoft.Extensions.Configuration.Json": "1.0.0-rc2-final"

它应该工作

Answer 2

不确定是否还有人遇到此问题,但我能够通过以下方式在dotnetcore控制台项目(netcoreapp2.0)中解决此问题:

dotnet add package Microsoft.Extensions.Configuration.Json

Answer 3

尝试在您的.csproj文件中添加以下内容：

<ItemGroup>
    <PackageReference Include="Microsoft.Extensions.Configuration" Version="2.2.0" />
    <PackageReference Include="Microsoft.Extensions.Configuration.FileExtensions" Version="2.2.0" />
    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="2.2.0" />
</ItemGroup>

Answer 4

还有一个可能的问题...

我必须添加这个：

<PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="3.0.0" />

为了编译：

var builder = new ConfigurationBuilder()
  .SetBasePath(Directory.GetCurrentDirectory())
  ...

我很确定这是一个控制台应用程序。

Answer 5

其他需要考虑的事情：

using Microsoft.Extensions.Configuration;

如果没有该“using”语句，它将在 Microsoft.Extensions.Configuration.FileExtensions 中找不到扩展方法。

我遇到了麻烦，因为我们还：

using System.Configuration;

并且与“ConfigurationBuilder”发生了名称冲突。添加

using Microsoft.Extensions.Configuration;

行...删除

using System.Configuration;

行，然后完全限定 System.Configuration 下的任何内容。