C# .Net Visual Studio默认控制器有错误
我为显示小图像(我不知道如何放大它们)和显示大量代码而提前道歉,但其中大多数只是供参考,并为读者简要介绍我正在做的事情 我对.Net和Visual Studio非常陌生。我正在尝试实现一个名为Inventory的数据库。它有一个多对多的关系!(产品类别)。目前我已经为它创建了页面(下图)。我对CRUD方法使用了VisualStudio的默认控制器,但现在它们有我无法修复的错误。我已经标记了CategoryController.cs中的所有错误 注:我可以上传项目,如果有人足够友好,看看它,因为它更容易这样做 这是类别的索引页 当我点击饮料的详细信息时,它会列出所有具有该类别ID的产品。(饮料=1) 错误列表(右键单击->在新选项卡中打开图像) 型号/类别.csC# .Net Visual Studio默认控制器有错误,c#,asp.net,visual-studio-2013,C#,Asp.net,Visual Studio 2013,我为显示小图像(我不知道如何放大它们)和显示大量代码而提前道歉,但其中大多数只是供参考,并为读者简要介绍我正在做的事情 我对.Net和Visual Studio非常陌生。我正在尝试实现一个名为Inventory的数据库。它有一个多对多的关系!(产品类别)。目前我已经为它创建了页面(下图)。我对CRUD方法使用了VisualStudio的默认控制器,但现在它们有我无法修复的错误。我已经标记了CategoryController.cs中的所有错误 注:我可以上传项目,如果有人足够友好,看看它,因为它
using System.Collections.Generic;
namespace Inventory.Models
{
public class Category
{
public int ID { get; set; }
public string Name { get; set; }
public List<Product> Products { get; set; }
}
}
使用System.Collections.Generic;
名称空间清单.Models
{
公共类类别
{
公共int ID{get;set;}
公共字符串名称{get;set;}
公共列表产品{get;set;}
}
}
控制器/类别控制器.cs
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Net;
using System.Web;
using System.Web.Mvc;
using Inventory.DAL;
using Inventory.Models;
namespace Inventory.Controllers
{
public class CategoryController : Controller
{
private InventoryContext db = new InventoryContext();
// GET: Category
public ActionResult Index()
{
return View(db.Categories.ToList());
}
// GET: Category/Details/5
public ActionResult Details(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Category category = db.Categories.Find(id); <--Line 31 Error 3 and 4
if (category == null)
{
return HttpNotFound();
}
return View(category);
}
// GET: Category/Create
public ActionResult Create()
{
return View();
}
// POST: Category/Create
// To protect from overposting attacks, please enable the specific properties you want to bind to, for
// more details see http://go.microsoft.com/fwlink/?LinkId=317598.
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create([Bind(Include = "ID,Name")] Category category)
{
if (ModelState.IsValid)
{
db.Categories.Add(category);
db.SaveChanges(); <-- Line 55 Error 5
return RedirectToAction("Index");
}
return View(category);
}
// GET: Category/Edit/5
public ActionResult Edit(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Category category = db.Categories.Find(id);<--Line 69 Error 6 and 7
if (category == null)
{
return HttpNotFound();
}
return View(category);
}
// POST: Category/Edit/5
// To protect from overposting attacks, please enable the specific properties you want to bind to, for
// more details see http://go.microsoft.com/fwlink/?LinkId=317598.
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit([Bind(Include = "ID,Name")] Category category)
{
if (ModelState.IsValid)
{
db.Entry(category).State = EntityState.Modified; <--Line 86 Error 8
db.SaveChanges(); <--Line 87 Error 9
return RedirectToAction("Index");
}
return View(category);
}
// GET: Category/Delete/5
public ActionResult Delete(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Category category = db.Categories.Find(id); <--Line 100 Error 10 and 11
if (category == null)
{
return HttpNotFound();
}
return View(category);
}
// POST: Category/Delete/5
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public ActionResult DeleteConfirmed(int id)
{
Category category = db.Categories.Find(id); <--Line 113 Error 12 and 13
db.Categories.Remove(category);
db.SaveChanges(); <--Line 115 Error 14
return RedirectToAction("Index");
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
db.Dispose(); <--Line 123 Error 15
}
base.Dispose(disposing);
}
}
}
使用系统;
使用System.Collections.Generic;
使用系统数据;
使用System.Data.Entity;
使用System.Linq;
Net系统;
使用System.Web;
使用System.Web.Mvc;
使用Inventory.DAL;
使用库存模型;
命名空间清单.控制器
{
公共类类别控制器:控制器
{
私有InventoryContext db=新的InventoryContext();
//获取:类别
公共行动结果索引()
{
返回视图(db.Categories.ToList());
}
//获取:类别/详细信息/5
公共行动结果详细信息(int?id)
{
if(id==null)
{
返回新的HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Category Category=db.Categories.Find(id);但是为了能够搜索id,它必须是一个intI,它说Inventory.Models.Category不包含IdCategory=db.Categories.Find(new Category(){id=id})的定义;.List InventoryContext.Categories!System.Collections.GenericList Find(System.Predicate)的最佳重载方法匹配有一些无效的参数运算符“==”不能应用于“int”和“inventory.Models.Category”类型的操作数我已经修复了它!感谢您的输入
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Net;
using System.Web;
using System.Web.Mvc;
using Inventory.DAL;
using Inventory.Models;
namespace Inventory.Controllers
{
public class CategoryController : Controller
{
private InventoryContext db = new InventoryContext();
// GET: Category
public ActionResult Index()
{
return View(db.Categories.ToList());
}
// GET: Category/Details/5
public ActionResult Details(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Category category = db.Categories.Find(id); <--Line 31 Error 3 and 4
if (category == null)
{
return HttpNotFound();
}
return View(category);
}
// GET: Category/Create
public ActionResult Create()
{
return View();
}
// POST: Category/Create
// To protect from overposting attacks, please enable the specific properties you want to bind to, for
// more details see http://go.microsoft.com/fwlink/?LinkId=317598.
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create([Bind(Include = "ID,Name")] Category category)
{
if (ModelState.IsValid)
{
db.Categories.Add(category);
db.SaveChanges(); <-- Line 55 Error 5
return RedirectToAction("Index");
}
return View(category);
}
// GET: Category/Edit/5
public ActionResult Edit(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Category category = db.Categories.Find(id);<--Line 69 Error 6 and 7
if (category == null)
{
return HttpNotFound();
}
return View(category);
}
// POST: Category/Edit/5
// To protect from overposting attacks, please enable the specific properties you want to bind to, for
// more details see http://go.microsoft.com/fwlink/?LinkId=317598.
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit([Bind(Include = "ID,Name")] Category category)
{
if (ModelState.IsValid)
{
db.Entry(category).State = EntityState.Modified; <--Line 86 Error 8
db.SaveChanges(); <--Line 87 Error 9
return RedirectToAction("Index");
}
return View(category);
}
// GET: Category/Delete/5
public ActionResult Delete(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Category category = db.Categories.Find(id); <--Line 100 Error 10 and 11
if (category == null)
{
return HttpNotFound();
}
return View(category);
}
// POST: Category/Delete/5
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public ActionResult DeleteConfirmed(int id)
{
Category category = db.Categories.Find(id); <--Line 113 Error 12 and 13
db.Categories.Remove(category);
db.SaveChanges(); <--Line 115 Error 14
return RedirectToAction("Index");
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
db.Dispose(); <--Line 123 Error 15
}
base.Dispose(disposing);
}
}
}
using System.Collections.Generic;
using Inventory.Models;
using System.Linq;
namespace Inventory.DAL
{
public class InventoryContext
{
public List<Product> Products { get; set; }
public List<Category> Categories { get; set; }
public InventoryContext()
{
Products = new List<Product>
{
new Product{Id=1,CategoryId=1,Brand="Coca Cola", Name="Coca Cola",Barcode="00001",Price=150},
new Product{Id=2,CategoryId=1,Brand="Pepsi", Name="Pepsi",Barcode="00011",Price=150},
new Product{Id=3,CategoryId=2,Brand="Homebrand", Name="Baked Beans",Barcode="0002",Price=250},
new Product{Id=4,CategoryId=2,Brand="Homebrand", Name="Baked Patatos",Barcode="0022",Price=250}
};
Categories = new List<Category>
{
new Category{ID=1, Name="Drink", Products = Products.Where(p => p.CategoryId == 1).ToList() },
new Category{ID=2,Name="Canned Food", Products = Products.Where(p => p.CategoryId == 2).ToList() }
};
foreach (var product in Products)
product.Categories = Categories.Where(c => c.ID == product.CategoryId).ToList();
}
}
}