Making A ServiceCollection Extensions

ServiceCollectionExtensions

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Extensions.DependencyInjection;

public static class ExampleExtensions
{

   public static IServiceCollection AddExampleService(this IServiceCollection services)
   {
      services.AddSingleton<IExampleService, ExampleService>();
      return services;
   }
}