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Update SampleDataController in blazorhosted template to use standard ApiController conventions

See original GitHub issue

The SampleDataController in the blazorhosted template doesn’t follow our latest ApiController conventions.

Current code:

    [Route("api/[controller]")]
    public class SampleDataController : Controller
    {
        private static string[] Summaries = new[]
        {
            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
        };

        [HttpGet("[action]")]
        public IEnumerable<WeatherForecast> WeatherForecasts()
        {
            var rng = new Random();
            return Enumerable.Range(1, 5).Select(index => new WeatherForecast
            {
                Date = DateTime.Now.AddDays(index),
                TemperatureC = rng.Next(-20, 55),
                Summary = Summaries[rng.Next(Summaries.Length)]
            });
        }
    }

Expected code:

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

        [HttpGet]
        public ActionResult<IEnumerable<WeatherForecast>> GetWeatherForecasts()
        {
            var rng = new Random();
            return Enumerable.Range(1, 5).Select(index => new WeatherForecast
            {
                Date = DateTime.Now.AddDays(index),
                TemperatureC = rng.Next(-20, 55),
                Summary = Summaries[rng.Next(Summaries.Length)]
            }).ToList();
        }
    }

We should also update the routing setup in the Server project to call MapControllers instead of MapDefaultControllerRoute and call AddControllers instead of AddMvc.