Read Config file in ASP.NET 5

ASP.NET vNext has a new configuration system.

With the new version of ASP.NET more than one file type is supported.

Currently, there are 3 different file types that are supported: Json, Xml and Ini.

For example, we can define connection string in config.json file:

    "Data": {
        "DefaultConnection": { 
            "ConnectionString": "Server=(localdb)\\mssqllocaldb;Database=DbName;Trusted_Connection=True;MultipleActiveResultSets=true"

You can also get  settings from Environment Variables.

To read connection string from config.json from any location in your app you need to add a reference to Microsoft.Framework.ConfigurationModel.Json.

Now simple import namespace and use code below to read connection string from config.json:


using Microsoft.Framework.ConfigurationModel.Json;

var configuration = new Configuration()

var connectionString = configuration.Get("Data:DefaultConnection:ConnectionString");


You can also load configuration from multiple different config files:


  var configuration = new Configuration()

To use xml files you need to reference Microsoft.Framework.ConfigurationModel.Xml and for Ini Microsoft.Framework.ConfigurationModel.

Supporting multiple config files and reading values from config files has never been easier.

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2 Comments on Read Config file in ASP.NET 5

  1. Cesar Bludata
    October 26, 2015 at 12:55 pm (9 years ago)

    Hello, I’m trying to use this, but I’m with some problem, I hope that you can help me 🙂

    First, the namespace that I neet to put is “using Microsoft.Framework.ConfigurationModel;” without the “.Json” in the end. I tried with “.Json” but the method “Configuration” wasn’t found.
    In my project.json file, I’ve both libs, “Microsoft.Framework.ConfigurationModel” and “Microsoft.Framework.ConfigurationModel.Json”.

    After that “diference”, when the code is executed, I got an exception “Object reference not set to an instance of an object.” and the stack trace is:

    at Microsoft.Framework.ConfigurationModel.PathResolver.get_ApplicationBaseDirectory()
    at Microsoft.Framework.ConfigurationModel.JsonConfigurationExtension.AddJsonFile(IConfigurationSourceRoot configuration, String path, Boolean optional)
    at Microsoft.Framework.ConfigurationModel.JsonConfigurationExtension.AddJsonFile(IConfigurationSourceRoot configuration, String path)
    at Project.SharedKernel.MyConfigurations..cctor() in C:ProjectProject.SharedKernelMyConfigurations.cs:line 86

    My class:

    static CredinetConfigurations()
    var configuration = new Configuration().AddJsonFile(“MyConfigurations.json”).AddEnvironmentVariables();


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