Reading config from a c# console application

 Console application

1. Install nuget package Microsoft.Extensions.Hosting

2. 

using Microsoft.Extensions.Hosting;

using Microsoft.Extensions.Configuration;

using IHost host = Host.CreateDefaultBuilder(args).Build();

IConfiguration config = new ConfigurationBuilder()

    .AddJsonFile("appSettings.json")

    .AddEnvironmentVariables()

    .Build();

Settings settings = config.GetRequiredSection(key: "Settings").Get<Settings>();

Console.WriteLine(settings.KeyOne);

Console.WriteLine(settings.KeyTwo);

Console.WriteLine(settings.KeyThree.Message);

foreach(var ipAddress in settings.IPAddresses)

{

    Console.WriteLine(ipAddress);

}

foreach(var versions in settings.KeyThree.SupportedVersions)

{

    Console.WriteLine(versions.Key);

    Console.WriteLine(versions.Value);

}

Console.WriteLine(settings.KeyThree.SupportedVersions);

await host.RunAsync();

in the properties of the project add the following.

<ItemGroup>

<Content Include="appSettings.json">

<CopyToOutputDirectory>Always</CopyToOutputDirectory>

</Content>

</ItemGroup>

appSettings.json

{

  "Settings": {

    "KeyOne": 1,

    "KeyTwo": true,

    "KeyThree": {

      "Message": "Oh, that's nice",

      "SupportedVersions": {

        "v1": "1.0.0",

        "v2": "2.0.0"

      }

    },

    "IPAddresses": [

      "46.36.198.121",

      "46.36.198.122",

      "46.36.198.123",

      "46.36.198.124",

      "46.36.198.125"

    ]

  }

}