server/aspnetapp/Controllers/WebApi/CounterController.cs

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#nullable disable
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using aspnetapp;

public class CounterRequest {
    public string action { get; set; }
}
public class CounterResponse {
    public int data { get; set; }
}

namespace aspnetapp.Controllers
{
    [Route("api/count")]
    [ApiController]
    public class CounterController : ControllerBase
    {
        private readonly CounterContext _context;

        public CounterController(CounterContext context)
        {
            _context = context;
        }
        private async Task<Counter> getCounterWithInit()
        {
            var counters = await _context.Counters.AsNoTracking().ToListAsync();
            if (counters.Count() > 0)
            {
                return counters[0];
            }
            else
            {
                var counter = new Counter { count = 0, createdAt = DateTime.Now, updatedAt = DateTime.Now };
                _context.Counters.Add(counter);
                await _context.SaveChangesAsync();
                return counter;
            }
        }
        // GET: api/count
        [HttpGet]
        public async Task<ActionResult<CounterResponse>> GetCounter()
        {
            var counter =  await getCounterWithInit();
            return new CounterResponse { data = counter.count };
        }

        // POST: api/Counter
        // To protect from overposting attacks, see https://go.microsoft.com/fwlink/?linkid=2123754
        [HttpPost]
        public async Task<ActionResult<CounterResponse>> PostCounter(CounterRequest data)
        {
            if (data.action == "inc") {
                var counter = await getCounterWithInit();
                counter.count += 1;