Gateways/Pages/PointMapAdmin/Delete.cshtml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.EntityFrameworkCore;
using IoTSharp.Gateway.Modbus.Data;

namespace IoTSharp.Gateway.Modbus.Pages.PointMapAdmin
{
    public class DeleteModel : PageModel
    {
        private readonly IoTSharp.Gateway.Modbus.Data.ApplicationDbContext _context;

        public DeleteModel(IoTSharp.Gateway.Modbus.Data.ApplicationDbContext context)
        {
            _context = context;
        }

        [BindProperty]
      public PointMapping PointMapping { get; set; } = default!;

        public async Task<IActionResult> OnGetAsync(Guid? id)
        {
            if (id == null || _context.PointMappings == null)
            {
                return NotFound();
            }

            var pointmapping = await _context.PointMappings.FirstOrDefaultAsync(m => m.Id == id);

            if (pointmapping == null)
            {
                return NotFound();
            }
            else 
            {
                PointMapping = pointmapping;
            }
            return Page();
        }

        public async Task<IActionResult> OnPostAsync(Guid? id)
        {
            if (id == null || _context.PointMappings == null)
            {
                return NotFound();
            }
            var pointmapping = await _context.PointMappings.FindAsync(id);

            if (pointmapping != null)
            {
                PointMapping = pointmapping;
                _context.PointMappings.Remove(PointMapping);
                await _context.SaveChangesAsync();
            }

            return RedirectToPage("./Index");
        }
    }
}