在MVC6中读取config.json时引发NullReferenceException [英] NullReferenceException thrown while reading config.json in MVC6

问题描述

我正在开发MVC6 Web应用程序.我的Startup.cs具有以下代码-

I'm working on MVC6 webapp. My Startup.cs has the following code-

public class Startup
{
    public static Microsoft.Framework.ConfigurationModel.IConfiguration Configuration { get; set; }

    public Startup(IHostingEnvironment env)
    {
       //following line throws NullReferenceException
       Configuration = new Configuration().AddJsonFile("config.json").AddEnvironmentVariables();
    }
}

config.json-

config.json-

{
    "Data": {
        "DefaultConnection": {
            "ConnectionString": "Server=(localdb)\\MSSQLLocalDB;Database=_CHANGE_ME;Trusted_Connection=True;"
         }
     }
}

有帮助吗?

更新:这个问题不仅仅与NullReferenceException有关.在ASP.NET-5 MVC-6，config.json是新增功能.我正在使用代码作为在几个博客中都可以找到它.这里有几个链接-

UPDATE: This question is not all about NullReferenceException. In ASP.NET-5 MVC-6, config.json is a new addition. I am using the code as it is found in several blogs. Here are few links-

• https://github.com/aspnet/MusicStore/blob/master/src/MusicStore/Startup.cs
• http://forums.asp.net/t/1999143.aspx?如何+配置+连接+字符串+ in + MVC + 6 + in + ASP + NET + vNext
>
• http://blog.developers.ba/read-config-file-in-asp-net-vnext/

推荐答案

如果使用的是Visual Studio的RTM版本，则必须使用asp.net的beta5修订版.在此版本中，用于配置的名称空间已更改.

If you are using the RTM version of Visual Studio you must be working with beta5 revision of asp.net. In this version namespaces for configuration has been changed.

，您必须添加以下程序包: Microsoft.Framework.Configuration.Json

You must add this package: Microsoft.Framework.Configuration.Json

此代码必须对您有用:

using Microsoft.Framework.Configuration;
using Microsoft.Framework.Runtime;

namespace Test
{
    public class Startup
    {
        public IConfiguration Configuration { get; set; }

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

            Configuration = builder.Build();
        }
    }
}

这篇关于在MVC6中读取config.json时引发NullReferenceException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！