adminsystem/adminsystem.Web/Controllers/Test.cs

using adminsystem.Data;
using adminsystem.Entity;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;

namespace adminsystem.Web.Controllers
{
    [Route("api/[controller]/[action]")]
    [ApiController]
    public class Test : ControllerBase
    {
        private PostgreDbContext _PostgreDbContext;
        [HttpGet]
        public string getstring()
        {
            return "helloworld";
        }

        public Test(PostgreDbContext postgreDbContext)
        {
            _PostgreDbContext = postgreDbContext;
        }

        [HttpGet]
        public async Task<ActionResult<IEnumerable<Geodata>>> GetData()
        {
            var geodata = await _PostgreDbContext.Geodatas.ToListAsync();
            if (geodata == null)
            {
                return NotFound();
            }

            return geodata;

        }
    }
}