为什么 VisualStudio 告诉我没有定义 AddJsonFile()方法？

我正在开发一个 ASP.NET 5 WebAPI 项目，使用的是 VS Ultimate 2015预览版。我尝试用这种方式配置应用程序(行号只是指南) :

1 using Microsoft.Framework.ConfigurationModel;
2
3 public IConfiguration Configuration { get; private set; }
4
5 public Startup()
6 {
7     Configuration = new Configuration()
8         .AddJsonFile("config.json")
9         .AddEnvironmentVariables();
10 }

第8行给出了一个错误: “ Configuration”不包含“ AddJsonFile”的定义..。

怎么了？

81315 次浏览
小开
最佳答案

You need to include the Microsoft.Extensions.Configuration.Json NuGet package if you want to call the .AddJsonFile() method.

See: https://github.com/aspnet/Configuration/tree/dev/src/Microsoft.Framework.ConfigurationModel.Json

For further reading, here's a nice tutorial: ASP.NET vNext Moving Parts: IConfiguration.

小开

In case anyone else has been having trouble with this, Microsoft have made breaking changes to this part of the framework on 16 August 2015. You must import the right versions of the dependencies and switch across to the new way of building up configuration.

My config includes:

{
"webroot": "wwwroot",
"version": "1.0.0-*",


"dependencies": {
"Microsoft.Framework.Runtime": "1.0.0-*",
"Microsoft.AspNet.Server.IIS": "1.0.0-beta7",
"Microsoft.AspNet.Diagnostics": "1.0.0-beta7",
"Microsoft.AspNet.Mvc": "6.0.0-beta7",
"Microsoft.Framework.Configuration": "1.0.0-beta7",
"Microsoft.Framework.Configuration.Json": "1.0.0-*"
},
...
}

This code, inspired by this question might go some way to helping you:

using System;
using Microsoft.AspNet.Builder;
using Microsoft.Framework.DependencyInjection;
using Messenger.Services;
using Microsoft.Framework.Configuration;
using Microsoft.Dnx.Runtime;
using Microsoft.AspNet.Hosting;


namespace Messenger
{
public class Startup
{
public Startup(IHostingEnvironment env, IApplicationEnvironment appEnv)
{
var configurationBuilder = new ConfigurationBuilder(appEnv.ApplicationBasePath)
.AddJsonFile("config.json")
.AddEnvironmentVariables();
Configuration = configurationBuilder.Build();
}


public IConfiguration Configuration { get; set; }
}
...


}

Hope it helps.

小开

I know this is a bit old but I just ran into this issue when attempting to build my first Asp.net core 1.0 blank project. In order to use the AddJsonFile method you must add a reference to Microsoft.Extensions.Configuration.Json to your project via Nuget.

To install the reference run the below command in the package manager console:

PM> Install-Package Microsoft.Extensions.Configuration.Json
小开

Under project.json you will need to add it within dependencies 

dependencies {
"Microsoft.Extensions.Configuration.Json": "1.0.0"
}

提交答案