ASP.NET MVC 6 Connection Sting config.json

asp.net asp.net-core asp.net-core-mvc asp.net-mvc entity-framework-core

Pregunta

El problema que tengo es cuando ejecuto el programa obtengo una excepción "System.NullReferenceException". No estoy seguro de cual es el problema. Este problema tampoco me permite iniciar una migración de datos usando dnx.

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#config.json

 {
  "Data": {
  "DefaultConnection": {
  "Connectionstring": "Data Server=.\\ERKANDEMIR5E91;Initial Catalog=RegistrationDB;Integrated Security=True;"
      }
   }
}

scoolDbContext.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.Data.Entity;
using Microsoft.Data.Entity.Metadata;
using School.Models;

namespace School.Context
{
    public class SchoolDbContext : DbContext
    {
       public DbSet<Course> Courses {get; set;}
    }
} 

Statup.cs

namespace School
{
public class Startup
{
    public static Microsoft.Extensions.Configuration.IConfiguration Configuration { get; set; }

    public Startup (IHostingEnvironment env)
    {
        //setup configuration sources
        Configuration = new ConfigurationBuilder()
       .AddJsonFile("config.json")
       .AddEnvironmentVariables()
       .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(IServiceCollection services)
    {
        //add services to container
        services.AddEntityFramework().AddSqlServer().AddDbContext<SchoolDbContext>(options => options.UseSqlServer(Configuration["Data:DefaultConnection:ConnectionString"]));
        services.AddMvc();

        //resolve dependency injections
        services.AddScoped<IRegistrationRepo, RegistrationRepo>();
        services.AddScoped<SchoolDbContext, SchoolDbContext>();           
    }

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

    }

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

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Respuesta aceptada

Debes arreglar el código

public Startup (IHostingEnvironment env)
{
    //setup configuration sources
    Configuration = new Configuration()
        .AddJsonFile("config.json")
        .AddEnvironmentVariables();
}

a

public Startup (IHostingEnvironment env)
{
    //setup configuration sources
    Configuration = new ConfigurationBuilder()
        .AddJsonFile("config.json")
        .AddEnvironmentVariables()
        .Build();
}

o para

public Startup (IHostingEnvironment env)
{
    //setup configuration sources
    Configuration = new ConfigurationBuilder()
        .AddJsonFile("config.json")
        .AddJsonFile($"config.{env.EnvironmentName}.json", true)
        .AddEnvironmentVariables()
        .Build();
}


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Licencia bajo: CC-BY-SA with attribution
No afiliado con Stack Overflow
¿Es esto KB legal? Sí, aprende por qué