server/aspnetapp/Controllers/WebUI/HomeController.cs

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using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;

namespace aspnetapp.Controllers.WebUI
{
    public class HomeController : Controller
    {
        private readonly CounterContext _context;

        public HomeController(CounterContext context)
        {
            _context = context;
        }

        public IActionResult Index()
        {
            return View();
        }

        public async Task<IActionResult> SetPhone(string wxid)
        {
            if (wxid == null)
            {
                return NotFound();
            }

            var buyrUserEntity = await _context.BuyrUsers.FirstOrDefaultAsync(s => s.WeChatOpenid == wxid).ConfigureAwait(false);
            if (buyrUserEntity == null)
            {
                return NotFound();
            }

            return View(buyrUserEntity);
        }

        [HttpPost]
        public async Task<IActionResult> SetPhone(int? id, string phone)
        {
            if (id == null)
            {
                return NotFound();
            }

            var buyrUserEntity = await _context.BuyrUsers.FindAsync(id);
            if (buyrUserEntity == null)
            {
                return NotFound();
            }
            buyrUserEntity.Phone = phone;

            try
            {
                await _context.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!BuyrUserEntityExists(id.Value))
                {
                    return NotFound();
                }