C# MVC4和EF5-模型视图-代码在错误的位置?
我通常使用SQL和SSR,并且是C#的新手,正在从事我的第一个MVC项目 我的目标是创建一个页面,显示一个包含父项及其关联子项记录的表,而不需要父项为每个子项值重复 列1父表的主键 列2父表中的名称 第3列子名称列表 为此,我尝试创建一个模型视图 我相信我在代码放置方面犯了很多错误 模型视图C# MVC4和EF5-模型视图-代码在错误的位置?,c#,asp.net-mvc,linq,C#,Asp.net Mvc,Linq,我通常使用SQL和SSR,并且是C#的新手,正在从事我的第一个MVC项目 我的目标是创建一个页面,显示一个包含父项及其关联子项记录的表,而不需要父项为每个子项值重复 列1父表的主键 列2父表中的名称 第3列子名称列表 为此,我尝试创建一个模型视图 我相信我在代码放置方面犯了很多错误 模型视图 using System; using System.Collections.Generic; using System.ComponentModel.DataAnnotations; using Syst
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;
using System.Data.Entity;
namespace SupplierItemTest.Models
{
public class VM_Trade
{
[Required]
[Display(Name = "Tax Info")]
public virtual string TaxpayerID { get; set; }
[Required]
[Display(Name = "Entity Name")]
public virtual string Supplier { get; set; }
[Required]
[Display(Name = "Trading Names")]
public virtual string SupplierTradingName1 { get; set; }
[Required]
[Display(Name = "Supplier Number")]
public virtual string EhSupplierNumber { get; set; }
}
}
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using SupplierItemTest.Models;
namespace SupplierItemTest.Controllers
{
public class TradingNameController : Controller
{
private SupplierItemEntities db = new SupplierItemEntities();
//
// GET: /TradingName/
public ActionResult Index()
{
var Trade_View =
from s in db.Suppliers
join st in db.SupplierTradingNames on s.TaxpayerID equals st.TaxpayerID
join sn in db.EhSuppliers on s.TaxpayerID equals sn.TaxpayerID
orderby s.TaxpayerID
select new VM_Trade
{
SupplierTradingName1 = st.SupplierTradingName1,
TaxpayerID = s.TaxpayerID,
Supplier = s.SupplierName,
EhSupplierNumber = sn.EhSupplierNumber
};
return View(Trade_View.ToList());
@model IEnumerable<SupplierItemTest.Models.VM_Trade>
@{
ViewBag.Title = "Index";
}
<h2>Index</h2>
<p>
@Html.ActionLink("Create New", "Create")
</p>
<table>
<tr>
<th>
@Html.DisplayNameFor(model => model.TaxpayerID)
</th>
<th>
@Html.DisplayNameFor(model => model.Supplier)
</th>
<th>
@Html.DisplayNameFor(model => model.EhSupplierNumber)
</th>
<th>
@Html.DisplayNameFor(model => model.SupplierTradingName1)
</th>
<th></th>
</tr>
@foreach (var item in Model) {
<tr>
<td>
@Html.DisplayFor(modelItem => item.TaxpayerID)
</td>
<td>
@Html.DisplayFor(modelItem => item.Supplier)
</td>
<td>
@Html.DisplayFor(modelItem => item.EhSupplierNumber)
</td>
<td>
@Html.DisplayFor(modelItem => item.SupplierTradingName1)
</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>
}
</table>
控制器视图
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;
using System.Data.Entity;
namespace SupplierItemTest.Models
{
public class VM_Trade
{
[Required]
[Display(Name = "Tax Info")]
public virtual string TaxpayerID { get; set; }
[Required]
[Display(Name = "Entity Name")]
public virtual string Supplier { get; set; }
[Required]
[Display(Name = "Trading Names")]
public virtual string SupplierTradingName1 { get; set; }
[Required]
[Display(Name = "Supplier Number")]
public virtual string EhSupplierNumber { get; set; }
}
}
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using SupplierItemTest.Models;
namespace SupplierItemTest.Controllers
{
public class TradingNameController : Controller
{
private SupplierItemEntities db = new SupplierItemEntities();
//
// GET: /TradingName/
public ActionResult Index()
{
var Trade_View =
from s in db.Suppliers
join st in db.SupplierTradingNames on s.TaxpayerID equals st.TaxpayerID
join sn in db.EhSuppliers on s.TaxpayerID equals sn.TaxpayerID
orderby s.TaxpayerID
select new VM_Trade
{
SupplierTradingName1 = st.SupplierTradingName1,
TaxpayerID = s.TaxpayerID,
Supplier = s.SupplierName,
EhSupplierNumber = sn.EhSupplierNumber
};
return View(Trade_View.ToList());
@model IEnumerable<SupplierItemTest.Models.VM_Trade>
@{
ViewBag.Title = "Index";
}
<h2>Index</h2>
<p>
@Html.ActionLink("Create New", "Create")
</p>
<table>
<tr>
<th>
@Html.DisplayNameFor(model => model.TaxpayerID)
</th>
<th>
@Html.DisplayNameFor(model => model.Supplier)
</th>
<th>
@Html.DisplayNameFor(model => model.EhSupplierNumber)
</th>
<th>
@Html.DisplayNameFor(model => model.SupplierTradingName1)
</th>
<th></th>
</tr>
@foreach (var item in Model) {
<tr>
<td>
@Html.DisplayFor(modelItem => item.TaxpayerID)
</td>
<td>
@Html.DisplayFor(modelItem => item.Supplier)
</td>
<td>
@Html.DisplayFor(modelItem => item.EhSupplierNumber)
</td>
<td>
@Html.DisplayFor(modelItem => item.SupplierTradingName1)
</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>
}
</table>
查看
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;
using System.Data.Entity;
namespace SupplierItemTest.Models
{
public class VM_Trade
{
[Required]
[Display(Name = "Tax Info")]
public virtual string TaxpayerID { get; set; }
[Required]
[Display(Name = "Entity Name")]
public virtual string Supplier { get; set; }
[Required]
[Display(Name = "Trading Names")]
public virtual string SupplierTradingName1 { get; set; }
[Required]
[Display(Name = "Supplier Number")]
public virtual string EhSupplierNumber { get; set; }
}
}
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using SupplierItemTest.Models;
namespace SupplierItemTest.Controllers
{
public class TradingNameController : Controller
{
private SupplierItemEntities db = new SupplierItemEntities();
//
// GET: /TradingName/
public ActionResult Index()
{
var Trade_View =
from s in db.Suppliers
join st in db.SupplierTradingNames on s.TaxpayerID equals st.TaxpayerID
join sn in db.EhSuppliers on s.TaxpayerID equals sn.TaxpayerID
orderby s.TaxpayerID
select new VM_Trade
{
SupplierTradingName1 = st.SupplierTradingName1,
TaxpayerID = s.TaxpayerID,
Supplier = s.SupplierName,
EhSupplierNumber = sn.EhSupplierNumber
};
return View(Trade_View.ToList());
@model IEnumerable<SupplierItemTest.Models.VM_Trade>
@{
ViewBag.Title = "Index";
}
<h2>Index</h2>
<p>
@Html.ActionLink("Create New", "Create")
</p>
<table>
<tr>
<th>
@Html.DisplayNameFor(model => model.TaxpayerID)
</th>
<th>
@Html.DisplayNameFor(model => model.Supplier)
</th>
<th>
@Html.DisplayNameFor(model => model.EhSupplierNumber)
</th>
<th>
@Html.DisplayNameFor(model => model.SupplierTradingName1)
</th>
<th></th>
</tr>
@foreach (var item in Model) {
<tr>
<td>
@Html.DisplayFor(modelItem => item.TaxpayerID)
</td>
<td>
@Html.DisplayFor(modelItem => item.Supplier)
</td>
<td>
@Html.DisplayFor(modelItem => item.EhSupplierNumber)
</td>
<td>
@Html.DisplayFor(modelItem => item.SupplierTradingName1)
</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>
}
</table>
@model IEnumerable
@{
ViewBag.Title=“Index”;
}
指数
@ActionLink(“新建”、“创建”)
@DisplayNameFor(model=>model.TaxpayerID)
@DisplayNameFor(model=>model.Supplier)
@DisplayNameFor(model=>model.EhSupplierNumber)
@DisplayNameFor(model=>model.SupplierTradingName1)
@foreach(模型中的var项目){
@DisplayFor(modelItem=>item.TaxpayerID)
@DisplayFor(modelItem=>item.Supplier)
@DisplayFor(modelItem=>item.EhSupplierNumber)
@DisplayFor(modelItem=>item.SupplierTradingName1)
@ActionLink(“编辑”,“编辑”,新的{/*id=item.PrimaryKey*/})|
@ActionLink(“详细信息”,“详细信息”,新的{/*id=item.PrimaryKey*/})|
@ActionLink(“删除”,“删除”,新的{/*id=item.PrimaryKey*/})
}
- 最初,我试图将IEnumerable放在视图模型中,我的控制器LINQ返回以下结果
- 应在模型视图中使用IEnumerable
- LINQ不应该使用联接,因为它们在数据库中是一种关系
- 视图不应包含IEnumerable
- 我不知道如何从父列返回单个值,子行返回多个值
我已经读了几天了,似乎什么都可以用。在你看来,你首先要像访问对象一样访问模型,然后下面几行就开始列举它 所以我建议你遵循
在创建
VM\u Trade
类的新对象之前,请在选择新VM\u Trade
后添加()。视图模型和视图存在问题。类似情况下,您可以参考基本结构
我还建议您看看应用程序教程,它很好地解释了这些概念
您走的是正确的道路,只需对ViewModel和View进行一些更改,就可以完成。一旦结构修复,您将有更具体的问题,社区将乐于回答
编辑:这只是一点帮助,有一个Nuget软件包“EntityFramework.Sample”,它为您提供了示例模型和一个演示DbContext集供您使用。感谢您的建议-尽管音乐商店确实很有帮助,但仍在工作。