WeatherForecastController.cs

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.AspNetCore.Mvc;

namespace Sample.Controllers
{
	public class WeatherForecast
	{
		public DateTime Date { get; set; }

		public int TemperatureC { get; set; }

		public int TemperatureF => 32 + (int) (TemperatureC / 0.5556);

		public string Summary { get; set; }
	}

	[ApiController]
	[Route("[controller]")]
	public class WeatherForecastController : ControllerBase
	{
		private static readonly string[] Summaries =
		{
			"Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
		};

		[HttpGet]
		public IEnumerable<WeatherForecast> Get()
		{
			var random = new Random();

			return Enumerable
				.Range(1, 5)
				.Select(index => new WeatherForecast
					{
						Date = DateTime.Now.AddDays(index),
						TemperatureC = random.Next(-20, 55),
						Summary = Summaries[random.Next(Summaries.Length)]
					}
				)
				.ToArray();
		}
	}
}