.NET Core Examples: configuration binding and appsetting.json

appsettings.json

{
  "Smtp": {
    "Host": "smtp.gmail.com",
    "Port": 587,
    "UseSSL": true,
    "Username": "bob",
    "Password": "password",
  }
}

program.cs

using System;
using System.IO;
using Microsoft.Extensions.Configuration;

namespace Examples.Configuration
{
	internal class Program
	{
		private static void Main(string[] args)
		{
			//
			// Nuget packages needed:
			// - Microsoft.Extensions.Configuration
			// - Microsoft.Extensions.Configuration.Abstractions
			// - Microsoft.Extensions.Configuration.Binder
			// - Microsoft.Extensions.Configuration.Json
			//
			// Make sure appsettings.json has its properties set to "content", "always copy"
			//

			var builder = new ConfigurationBuilder();
			builder
				.SetBasePath(Directory.GetCurrentDirectory())
				.AddJsonFile("appsettings.json", false);

			IConfigurationRoot configuration = builder.Build();

			var smtpConfiguration = new SmtpConfiguration();
			IConfigurationSection section = configuration.GetSection("Smtp");

			section.Bind(smtpConfiguration);

			Console.WriteLine(smtpConfiguration.Host);
			Console.Read();
		}
	}

	public class SmtpConfiguration
	{
		public string Host { get; set; }
		public int Port { get; set; }
		public string Username { get; set; }
		public string Password { get; set; }
	}
}