Asp.net mvc 4 过帐时模型的属性变为空
我是MVC新手。现在,我尝试使用一个简单的MVC演示,将客户的信息打印到屏幕上并更新,然后发送回数据库 我不知道为什么客户的ID变为空,而其他的都很好 我想在屏幕上显示客户的ID,但我不想让用户编辑它以发布到我的数据库。我已经研究了几个小时了 我的代码: Customer.csAsp.net mvc 4 过帐时模型的属性变为空,asp.net-mvc-4,Asp.net Mvc 4,我是MVC新手。现在,我尝试使用一个简单的MVC演示,将客户的信息打印到屏幕上并更新,然后发送回数据库 我不知道为什么客户的ID变为空,而其他的都很好 我想在屏幕上显示客户的ID,但我不想让用户编辑它以发布到我的数据库。我已经研究了几个小时了 我的代码: Customer.cs using System; using System.Collections.Generic; using System.ComponentModel; using System.ComponentModel.DataA
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;
namespace PeopleManagement.Models
{
public class Customer
{
[Required]
public string Id { get; set; }
public string Name { get; set; }
public int Age { get; set; }
public Customer()
{
}
public Customer(string id, string name, int age)
{
Id = id;
this.Name = name;
this.Age = age;
}
}
}
using System.Collections.Generic;
using System.Web.Mvc;
using PeopleManagement.Models;
namespace PeopleManagement.Controllers
{
public class HomeController : Controller
{
public List<Customer> CustomersList { get; private set; } = new List<Customer>(5);
[HttpGet]
public ActionResult Index()
{
CustomersList.Add(new Customer("ID_1", "Name_1", 1));
CustomersList.Add(new Customer("ID_2", "Name_2", 2));
CustomersList.Add(new Customer("ID_3", "Name_3", 3));
ModelState.Clear();
return View(CustomersList);
}
[HttpPost]
public ActionResult Index(List<Customer> postbackCustomers)
{
if (!ModelState.IsValid)
return View(CustomersList);
CustomersList = postbackCustomers;
return View(CustomersList);
}
}
}
Index.cshtml
@using System.Web.UI.WebControls
@using PeopleManagement.Models
@model IList<Customer>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>First MVC Application</title>
<link href="@Url.Content("~/Content/css/customized-table.css")" rel="stylesheet" type="text/css" />
</head>
<body style="max-width:100%; max-height:100%">
<div id="pageTitle" style="text-align:center; color:red; font-size:24px; font-weight:bold;">Customer Management</div>
@using (@Html.BeginForm("Index", "Home", FormMethod.Post))
{
<div id="tablePanel" style="padding-top: 15px">
<table class="customized_table" border="1">
<tr>
<th>ID</th>
<th>Name</th>
<th>Age</th>
</tr>
@{
for (var i = 0; i < Model.Count; i++)
{
<tr>
<td>
@Html.HiddenFor(model => model[i].Name);
</td>
<td>
@Html.TextBoxFor(model => model[i].Name, new {@style = "min-width:100%; text-align:center", @disable = "true"})
</td>
<td>
@Html.TextBoxFor(model => model[i].Age)
</td>
</tr>
}
}
</table>
</div>
<div>
<p><input type="submit"/></p>
</div>
}
</body>
</html>
<script>
</script>
@使用System.Web.UI.WebControls
@使用人员管理模型
@模型IList
第一个MVC应用程序
客户管理
@使用(@Html.BeginForm(“Index”,“Home”,FormMethod.Post))
{
身份证件
名称
年龄
@{
对于(var i=0;imodel[i].Name);
@Html.TextBoxFor(model=>model[i].Name,新{@style=“min-width:100%;text-align:center”,@disable=“true”})
@Html.TextBoxFor(model=>model[i].Age)
}
}
}
HomeController.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;
namespace PeopleManagement.Models
{
public class Customer
{
[Required]
public string Id { get; set; }
public string Name { get; set; }
public int Age { get; set; }
public Customer()
{
}
public Customer(string id, string name, int age)
{
Id = id;
this.Name = name;
this.Age = age;
}
}
}
using System.Collections.Generic;
using System.Web.Mvc;
using PeopleManagement.Models;
namespace PeopleManagement.Controllers
{
public class HomeController : Controller
{
public List<Customer> CustomersList { get; private set; } = new List<Customer>(5);
[HttpGet]
public ActionResult Index()
{
CustomersList.Add(new Customer("ID_1", "Name_1", 1));
CustomersList.Add(new Customer("ID_2", "Name_2", 2));
CustomersList.Add(new Customer("ID_3", "Name_3", 3));
ModelState.Clear();
return View(CustomersList);
}
[HttpPost]
public ActionResult Index(List<Customer> postbackCustomers)
{
if (!ModelState.IsValid)
return View(CustomersList);
CustomersList = postbackCustomers;
return View(CustomersList);
}
}
}
使用System.Collections.Generic;
使用System.Web.Mvc;
使用人员管理模式;
命名空间PeopleManagement.Controllers
{
公共类HomeController:控制器
{
公共列表CustomerList{get;private set;}=新列表(5);
[HttpGet]
公共行动结果索引()
{
添加(新客户(“ID_1”,“名称_1”,1));
添加(新客户(“ID_2”,“Name_2”,2));
添加(新客户(“ID_3”,“名称_3”,3));
ModelState.Clear();
返回视图(CustomerList);
}
[HttpPost]
公共行动结果索引(列出回发客户)
{
如果(!ModelState.IsValid)
返回视图(CustomerList);
CustomersList=postbackCustomers;
返回视图(CustomerList);
}
}
}
有人能帮忙吗?在MVC中,如果你想从视图中获得一些值,你必须先在视图中获得该值。您似乎没有在视图中输入Id 像这样更改视图代码
for (var i = 0; i < Model.Count; i++)
{
<tr>
<td>
@Html.HiddenFor(model => model[i].Id)
</td>
<td>
@Html.TextBoxFor(model => model[i].Name, new { @style = "min-width:100%; text-align:center", @disable = "true" })
</td>
<td>
@Html.TextBoxFor(model => model[i].Age)
</td>
</tr>
}
for(变量i=0;imodel[i].Id)
@Html.TextBoxFor(model=>model[i].Name,新{@style=“min-width:100%;text-align:center”,@disable=“true”})
@Html.TextBoxFor(model=>model[i].Age)
}
希望这有帮助 实际上,您没有在index.html视图上显示ID,客户ID在您的示例中具有价值。您应该尝试在for each循环中以只读模式显示它
@Html.DisplayFor(model => model[i].Id)
除了不包括以下答案(1)中所示的隐藏输入外,属性
Name
不应同时包含隐藏输入和文本框。我假设您试图禁用文本框,而@disable=“true”
将不起作用(其disabled=“disabled”
),但只需将其设置为readonly=“readonly”
,并删除隐藏的输入。(2) ModelState.Clear()代码>是无意义的-在GET方法中,没有向ModelState
添加任何内容。(3) 返回视图(CustomerList)代码>没有意义-如果模型无效,为什么返回空列表。当我使用@Html.DisplayFor时,如何保护m ID?因为现在,我可以使用浏览器的调试器更改提交数据?