MessagePack.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;
using MessagePack;
using RestSharp;
using System.Diagnostics;

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

        private readonly ILogger<WeatherForecastController> _logger;

        public WeatherForecastController(ILogger<WeatherForecastController> logger)
        {
            _logger = logger;
        }

        [HttpGet]
       // [Produces("application/octet-stream")]
        public IActionResult Get()
        {
            HttpResponseMessage response = new HttpResponseMessage();
            var rng = new Random();
            var d = Enumerable.Range(1, 500).Select(index => new WeatherForecast
            {
                Date = DateTime.Now.AddDays(index),
                TemperatureC = rng.Next(-20, 55),
                Summary = Summaries[rng.Next(Summaries.Length)]
            }).ToList();

            var sd = MessagePackSerializer.Serialize(new test() { data = d });
            //response.Content = new ByteArrayContent(sd);
            var ms = new MemoryStream(sd);
            response.Content = new StreamContent(ms);

            //var ds = MessagePackSerializer.Deserialize<WeatherForecast>(sd);
            //response.Content.Headers.ContentDisposition = new System.Net.Http.Headers.ContentDispositionHeaderValue("attachment");
            //{FileName="data" };
            //response.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/octet-stream");
            return  new FileContentResult(sd, "application/octet-stream");
         
        }
        [MessagePackObject]
        public class test {
            [Key(1)]
            public List<WeatherForecast> data { get; set; }
        }
        [HttpPost]
        public void Post() {
            Stopwatch sw = new Stopwatch();
            sw.Start();
            var client = new RestClient("https://localhost:5001/weatherforecast");
            var request = new RestRequest(Method.GET);
            request.AddHeader("postman-token", "3e4f2699-414b-a5e6-701c-4d4f9689d458");
            request.AddHeader("cache-control", "no-cache");
            request.AddHeader("Content-Type", "application/octet-stream");
            request.AddHeader("accept", "application/octet-stream");
            IRestResponse response = client.Execute(request);
            var d = MessagePackSerializer.Deserialize<test>(response.RawBytes);
            sw.Stop();
            var we = sw.ElapsedMilliseconds;
           // return response;
            //var d = Enumerable.Range(1, 500).Select(index => new WeatherForecast
            //{
            //    Date = DateTime.Now.AddDays(index),
            //    TemperatureC = rng.Next(-20, 55),
            //    Summary = Summaries[rng.Next(Summaries.Length)]
            //}).ToArray();
            //var d = new WeatherForecast
            //{
            //    Date = DateTime.Now.AddDays(1),
            //    TemperatureC = rng.Next(-20, 55),
            //    Summary = Summaries[rng.Next(Summaries.Length)]
            //};

            //var sd = MessagePackSerializer.Serialize(d);
            //response.Content = new ByteArrayContent(sd);
            //var ds = MessagePackSerializer.Deserialize<WeatherForecast>(sd);
            //response.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/octet-stream");
            //return response;
        }
    }
}