如何使用一种操作方法 (ASP.NET) 更新数据库中 table 的所有行?

How to update all rows of a table in database using one Action method (ASP.NET)?

我想创建一个按钮,如果我点击它,它会更改数据库中 table 的整个列。请考虑以下代码:

型号:

using Player_Simulation.Data;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;

namespace Player_Simulation.Models
{
    public class Player
    {
        public int PlayerId { get; set; }
        public string PlayerName { get; set; }
        public int PlayerRating { get; set; }
        public int PlayerYear { get; set; }
        public int PlayerSkill { get; set; }
        public string PlayerCountry { get; set; }
        public ICollection<Match> Matches { get; set; } 

        public Player()
        {
            PlayerYear = 1;
            PlayerRating = 1000;
        }
    }
}

控制器:

namespace Player_Simulation.Controllers
{
    public class PlayerController : Controller
    {
        private readonly DataContext _database;

        public PlayerController(DataContext database)
        {
            _database = database;
        }

        [HttpPost]
        public void IncrementYear()
        {
            using (_database)
            {
                foreach (Player player in _database.Players)
                {
                    if (player != null)
                    {
                        int oldYear = player.PlayerYear;
                        player.PlayerYear = oldYear + 1;
                        _database.SaveChanges();
                    }
                }
            }
        }
    }
}

查看:

// removed code for shorter post
// the button to click so I can increment the 'year' column by 1
<a asp-controller="Player" asp-action="IncrementYear" class="btn btn-info">Increment Year</a>

图形:

最终,我想要一个可以将所有年份递增 1 的按钮。它不需要 return 视图或类似的东西。但是,在参考: and codegrepper.com后,我得到一个错误 405。请参阅上面在 PlayerController 上的 Action 方法调用 IncrementYear 以供我尝试。

如何正确更新所有这些数据行,使所有年份都递增?如果有任何帮助,我将不胜感激!

您使用 [httppost] 在您的 IncrementYear ation 中接收一个 post 请求,因此您需要在您的视图中发送一个 post 请求。

将按钮更改为:

<form method="post">
<button asp-controller="Player" asp-action="IncrementYear" class="btn btn-info">Increment Year</button>
</form>

控制器

public class PlayerController : Controller
    {
        private readonly TableContext _context;
        public PlayerController(TableContext tablecontext)
        {
            _context = tablecontext;
        }

        [HttpPost]
        public IActionResult IncrementYear()
        {
            foreach (var play in _context.players.ToList())
            {
                play.PlayerYear++;
                _context.SaveChanges();
            }

            return RedirectToAction("Privacy","Home");
        }
    }