ASP.NET Core MVC table 一直显示相同的数字

Question

我完全不知所措。一切似乎都是正确的。当我查看数据库时，提交的数字是正确的。但是当我去列出数据库中的数据时，数据库列表中的Amount列总是相同的数字。

当您转到存款选项卡时，您输入的第一个数字始终是将要显示的数字。因此，如果我输入 50 美元，50 美元将出现在交易选项卡中。但是，假设我回去投入 60 美元。它在交易历史选项卡中仍显示 50 美元，但在数据库中显示 60 美元。为什么不显示数据库中的号码？

账户管理员：

using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Identity;
using The_Bank_of_Cardinal.Areas.Identity.Data;
using Microsoft.AspNetCore.Mvc;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using The_Bank_of_Cardinal.Models;

namespace The_Bank_of_Cardinal.Controllers
{
    [Authorize]
    public class AccountController : Controller
    {
        private readonly TransactionConnection _tc;
        private readonly UserManager<CardinalUser> userManager;
        private readonly SignInManager<CardinalUser> signInManager;
        private readonly DepositConnection _dc;

        public AccountController(TransactionConnection tc, UserManager<CardinalUser> userManager, SignInManager<CardinalUser> signInManager, DepositConnection dc)
        {
            _tc = tc;
            this.userManager = userManager;
            this.signInManager = signInManager;
            _dc = dc;
        }

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

        public IActionResult Transactions()
        {
            var results = _tc.TransactionHistory.ToList();
            return View(results);
        }

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

        [HttpGet]
        public IActionResult Deposit(string Id)
        {
            var resultss = _dc.AspNetUsers.Where(s => s.Id == Id).FirstOrDefault();
            return View(resultss);
        }

        [HttpPost]
        public IActionResult Deposit(DepositModel model, TransactionModel tm)
        {
            var resultss = _dc.AspNetUsers.Where(s => s.Id == model.Id).FirstOrDefault();
            int test = model.AccountBalance + userManager.GetUserAsync(User).Result.AccountBalance;

            tm.UserName = userManager.GetUserAsync(User).Result.UserName;
            string name = tm.UserName;
            tm.Description = "personal deposit";
            tm.TransactionType = "Deposit";
            tm.Amount = "$" + model.AccountBalance.ToString();

            model.AccountBalance = test;

            _tc.TransactionHistory.Add(tm);
            _tc.SaveChanges();

            _dc.AspNetUsers.Remove(resultss);
            _dc.AspNetUsers.Add(model);
            _dc.SaveChanges();

            //_dc.AspNetUsers.

            return Content("This is your info \n" + 
                $"Name: {name} \n" + 
                $"Description: {tm.Description} \n" + 
                $"type: {tm.TransactionType} \n" + 
                $"Amount {tm.Amount} \n");
        }

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

交易视图：

@model IEnumerable<The_Bank_of_Cardinal.Models.TransactionModel>

@{
    ViewData["Title"] = "Transactions";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h1>Transactions</h1>

<p>
    <a asp-action="Create">Create New</a>
</p>
@*<table class="table">
    <thead>
        <tr>
            <th>
                @Html.DisplayNameFor(model => model.UserName)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.Description)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.TransactionType)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.Amount)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.Date)
            </th>
            <th></th>
        </tr>
    </thead>
    <tbody>
@foreach (var item in Model) {
        <tr>
            <td>
                @Html.DisplayFor(modelItem => item.UserName)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Description)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.TransactionType)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Amount)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Date)
            </td>
            <td>
                @Html.ActionLink("Edit", "Edit", new { /* id=item.PrimaryKey */ }) |
                @Html.ActionLink("Details", "Details", new { /* id=item.PrimaryKey */ }) |
                @Html.ActionLink("Delete", "Delete", new { /* id=item.PrimaryKey */ })
            </td>
        </tr>
}
    </tbody>
</table>*@

<div class="container">
    @if (Model != null)
    {
        <table class="table table-dark">
            <thead>
                <tr>
                    <th scope="col">Name</th>
                    <th scope="col">Description</th>
                    <th scope="col">Transaction Type</th>
                    <th scope="col">Amount</th>
                    <th scope="col">Date</th>
                </tr>
            </thead>
            <tbody>
                @foreach (var item in Model)
                {
                <tr>
                    <td>@Html.DisplayFor(modelItem => item.UserName)</td>
                    <td>@Html.DisplayFor(modelItem => item.Description)</td>
                    <td>@Html.DisplayFor(modelItem => item.TransactionType)</td>
                    <td>@Html.DisplayFor(modelItem => item.Amount)</td>
                    <td>@Html.DisplayFor(modelItem => item.Date)</td>
                </tr>
                }
            </tbody>
        </table>
    }
</div>

存款视图：

@model The_Bank_of_Cardinal.Models.DepositModel

@{
    ViewData["Title"] = "Deposit";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h1>Deposit</h1>

<h4>DepositModel</h4>
<hr />
<div class="row">
    <div class="col-md-4">
        <form asp-action="Deposit">
            <div asp-validation-summary="ModelOnly" class="text-danger"></div>
            <div class="form-group">
                <label hidden asp-for="Id" class="control-label"></label>
                <input hidden asp-for="Id" class="form-control" />
                <span asp-validation-for="Id" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="AccountBalance" class="control-label">Amount</label>
                <input asp-for="AccountBalance" class="form-control" value="0" />
                <span asp-validation-for="AccountBalance" class="text-danger"></span>
            </div>
            <div class="form-group">
                <input type="submit" value="Deposit" class="btn btn-primary" />
            </div>
        </form>
    </div>
</div>

<div>
    <a asp-action="Index">Back to List</a>
</div>

@section Scripts {
    @{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
}

存款模型：

using Microsoft.AspNetCore.Identity;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading.Tasks;
using The_Bank_of_Cardinal.Areas.Identity.Data;

namespace The_Bank_of_Cardinal.Models
{
    public class DepositModel
    {
        [Key]
        public string Id { get; set; }
        public int AccountBalance { get; set; }
    }
}

交易模式：

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Threading.Tasks;

namespace The_Bank_of_Cardinal.Models
{
    public class TransactionModel
    {
        [Key]
        public string UserName { get; set; }
        public string Description { get; set; }
        public string TransactionType { get; set; }
        public string Amount { get; set; }
        public DateTime Date { get; set; }
    }
}

存款DbContext:

using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace The_Bank_of_Cardinal.Models
{
    public class DepositConnection : DbContext
    {
        public DepositConnection(DbContextOptions<DepositConnection> options) : base(options)
        {
        }

        public DbSet<DepositModel> AspNetUsers { get; set; }
    }
}

交易DbContext：

using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace The_Bank_of_Cardinal.Models
{
    public class TransactionConnection : DbContext
    {
        public TransactionConnection(DbContextOptions<TransactionConnection> options) : base(options)
        {
        }

        public DbSet<TransactionModel> TransactionHistory { get; set; }
    }
}

Answer 1

您使用 @Html.XXXFor() 不正确。
当你想使用 HTML-helpers 用于 HTML <form> 来自 ViewModel 中集合的输入绑定时，你需要使用 for()，而不是 foreach() 并且您需要 For() 表达式中的 [int index] 索引器。
当你需要绑定一个表单对象/表单模型时和传递额外的数据在您看来，对单向数据使用 ViewData，对双向数据使用 Model。
- 我认为 ASP.NET MVC 和 ASP.NET Core 的视图模型和表单绑定系统需要重新思考，因为它完全错误要求 ViewModel 对象也是绑定的 表单模型 。在我自己的项目中，我对 ASP.NET 核心有自己的扩展，以允许我干净地使用单独的 types/objects。
虽然我无法修复您的 ActionLink 项

    <tbody>
@for( int i = 0; i < this.Model.Count; i++ ) {
    
        <tr>
            <td>
                @Html.DisplayFor( m => m[i].UserName )
            </td>
            <td>
                @Html.DisplayFor( m => m[i].Description )
            </td>
            <td>
                @Html.DisplayFor( m => m[i].TransactionType )
            </td>
            <td>
                @Html.DisplayFor( m => m[i].Amount )
            </td>
            <td>
                @Html.DisplayFor( m => m[i].Date )
            </td>
            <td>
                @Html.ActionLink("Edit", "Edit", new { /* id=item.PrimaryKey */ }) |
                @Html.ActionLink("Details", "Details", new { /* id=item.PrimaryKey */ }) |
                @Html.ActionLink("Delete", "Delete", new { /* id=item.PrimaryKey */ })
            </td>
        </tr>
}
    </tbody>

Answer 2

class TransactionModel 有主键属性 UserName。但是您有多个具有相同 UserName 值的 TransactionModel 实例。这是矛盾的。每个 TransactionModel 主键必须是唯一的。

将您的 TransactionModel class 更改为：

public class TransactionModel
{
    public int Id { get; set; } // This is the primary key.
    public string UserName { get; set; }
    public string Description { get; set; }
    public string TransactionType { get; set; }
    public decimal Amount { get; set; }
    public DateTime Date { get; set; }
}

属性 Id 是您的主键。它将自动递增。这是约定俗成的。参见：https://docs.microsoft.com/en-us/ef/core/modeling/keys?tabs=data-annotations#configuring-a-primary-key

和https://docs.microsoft.com/en-us/ef/core/modeling/generated-properties?tabs=data-annotations#primary-keys

旁注：属性 Amount 的类型应该是十进制而不是字符串，因此在上面的示例中对此进行了更改。本着同样的精神，枚举可能是 TransactionType 属性.

的更好选择

您当然需要使用 class TransactionModel 修改代码以考虑其新定义。

ASP.NET Core MVC table 一直显示相同的数字

ASP.NET Core MVC table keeps showing same number

c#

sql

asp.net-core-mvc