throw，throw ex 与 ExceptionDispatchInfo.Throw(ex)

using System.Diagnostics;
using System.Runtime.ExceptionServices;

using Microsoft.AspNetCore.Mvc;

using static System.Net.Mime.MediaTypeNames;

namespace WebSignalR.Controllers
{
    [ApiController]
    [Route("[controller]")]
    public class WeatherForecastController : ControllerBase
    {
       
        public WeatherForecastController()
        {
        }

        [HttpGet]
        public async Task Get()
        {
            try
            {
                //Test();
                Test2();
               // Test3();
            }
            catch (Exception ex )
            {

                throw;
            }
         

            await Task.Delay(1);
        }

        public void Test()
        {
            try
            {
                var res = Convert.ToInt32("1qq");
            }
            catch (Exception ex)
            {
                throw;
            }
           
        }

        public void Test2()
        {
            try
            {
                var res = Convert.ToInt32("1qq");
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        public void Test3()
        {
            try
            {
                var res = Convert.ToInt32("1qq");
            }
            catch (Exception ex)
            {
                ExceptionDispatchInfo.Throw(ex);
            }
        }

    }
}