在Beta8中没有Startup.cs的vNext中读取config.json

所以我没有启动文件，因为我的DAL在另一个项目中 . 我只是想能够读取该项目中的config.json文件以获取连接字符串 .

我尝试实例化一个Configuration类（似乎在beta4中），并使用它来获取连接字符串，但它不断传回null值 . 有人有任何见解吗？

文件夹结构：

=>MyProject.DAL
BlogContext.cs
config.json
project.json

这是我的project.json

{
  "version": "1.0.0-*",
  "description": "MyProject.DAL Class Library",
  "authors": [ "Admin" ],
  "tags": [ "" ],
  "projectUrl": "",
  "licenseUrl": "",
  "frameworks": {
    "dnx451": { },
    "dnxcore50": {
      "dependencies": {
        "Microsoft.CSharp": "4.0.1-beta-23409",
        "System.Collections": "4.0.11-beta-23409",
        "System.Linq": "4.0.1-beta-23409",
        "System.Runtime": "4.0.21-beta-23409",
        "System.Threading": "4.0.11-beta-23409"
      }
    }
  },
  "dependencies": {
    "EntityFramework.Core": "7.0.0-beta8",
    "EntityFramework.SqlServer": "7.0.0-beta8",
    "Microsoft.AspNet.Identity.EntityFramework": "3.0.0-beta8",
    "Microsoft.Framework.Configuration.Abstractions": "1.0.0-beta8",
    "Microsoft.Framework.Configuration.CommandLine": "1.0.0-beta8",
    "Microsoft.Framework.Configuration.EnvironmentVariables": "1.0.0-beta8",
    "Microsoft.Framework.Configuration.Json": "1.0.0-beta8",
    "Microsoft.Framework.ConfigurationModel": "1.0.0-beta4",
    "Microsoft.Framework.Logging.Console": "1.0.0-beta8",
    "MyProject.Entities": "1.0.0-*"
  }
    }

这是config.json

{
    "Data": {
        "DefaultConnection": {
      "ConnectionString": "Server=.\\SQLEXPRESS;Database=SolutionPub;Trusted_Connection=True;MultipleActiveResultSets=true"
    }
}

}

BlogContext.cs

public class BlogContext: DbContext
{

    public BlogContext()
    {
        Database.EnsureCreated();
    }

    public DbSet<Post> Posts { get; set; }
    public DbSet<Tag> Tags { get; set; }
    public DbSet<Comment> Comments { get; set; }
    public DbSet<Image> Images { get; set; }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        var configuration = new Configuration();
        var connectionString = configuration.Get("Data:DefaultConnection:ConnectionString");

        optionsBuilder.UseSqlServer(connectionString);

        base.OnConfiguring(optionsBuilder);
    }
}