bps-rw/Controllers/DataRtController.cs

using Microsoft.AspNetCore.Mvc;

namespace BpsRwApp.Controllers
{
    [Route("[controller]/[action]")]
    public class DataRtController : AppControllerBase
    {
        public IActionResult Index()
        {
            return View();
        }

        [HttpGet]
        public IActionResult Table()
        {
            var data = Enumerable.Range(0, 100)
                .Select(index =>
                {
                    var wilayah = ControllerSampleData.WilayahSeeds[index % ControllerSampleData.WilayahSeeds.Length];
                    return new
                    {
                        rt = ((index % 16) + 1).ToString("D3"),
                        rw = ((index / 5) + 1).ToString("D3"),
                        kecamatan = $"{wilayah.Kecamatan}, {wilayah.Kota}",
                    };
                })
                .ToArray();

            var response = new
            {
                data = data
            };

            return Json(response);
        }
    }
}