MVC CRUD 的两种方法

//Index.cshtml

@model IQueryable<MvcExam2.Models.Product>
@{
Layout = null;
}

<!DOCTYPE html>

<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>Index</title>
</head>
<body>
<div>
@Html.ActionLink("添加", "Add", "ProductCrud")
</div>
<div>
<table>
<tr>
<th>ModelNumber</th>
<th>ModelName</th>
<th>UnitCost</th>
<th>修改</th>
<th>删除</th>
</tr>
@foreach(MvcExam2.Models.Product p in Model)
{
<tr>
<td>@p.ModelNumber</td>
<td>@p.ModelName</td>
<td>@p.UnitCost</td>
<td>@Html.ActionLink("修改", "Update", "ProductCrud",new RouteValueDictionary(new { id = @p.ProductID }),null)</td>
<td>@Html.ActionLink("删除","Delete","ProductCrud", new RouteValueDictionary(new { id = @p.ProductID }), null)</td>
</tr>
}
</table>
</div>
</body>

</html>

//Add.cshtml

@model MvcExam2.Models.Product
@{
Layout = null;
}

<!DOCTYPE html>

<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>Add</title>
</head>
<body>
<div>
@using (Html.BeginForm("Add", "ProductCrud", FormMethod.Post))
{
<span>ModelNumber：</span>@Html.TextBoxFor(p => p.ModelNumber);<br />
<span>ModelName：</span>@Html.TextBoxFor(p => p.ModelName);<br />
<span>UnitCost：</span>@Html.TextBoxFor(p=>p.UnitCost);<br />
<input type="submit" name="name" value="submit" />
}
</div>
</body>

</html>

//Update.cshtml

@model MvcExam2.Models.Product
@{
Layout = null;
}

<!DOCTYPE html>

<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>Update</title>
</head>
<body>
<div>
@using (Html.BeginForm("Update", "ProductCrud", FormMethod.Post))
{
@Html.HiddenFor(p=>p.ProductID)
<span>ModelNumber：</span>@Html.TextBoxFor(p => p.ModelNumber) <br />
<span>ModelName：</span>@Html.TextBoxFor(p => p.ModelName) <br />
<span>UnitCost：</span>@Html.TextBoxFor(p => p.UnitCost) <br />
<input type="submit" name="name" value="submit" />
}
</div>
</body>
</html>

//ProductCrudController

using MvcExam2.Models;
using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Data.Entity.Migrations;

namespace MvcExam2.Controllers
{
public class ProductCrudController : Controller
{
DbContext context = new StoreContext();
// GET: ProductCrud
public ActionResult Index()
{
IQueryable<Product> list = context.Set<Product>();
return View(list);
}

public ActionResult Add()
{
return View();
}

[HttpPost]
public ActionResult Add(Product p)
{
p.CategoryID = 14;
//第一种方法：用curd方法
//context.Set<Product>().Add(p);

//第二种方法：用状态跟踪
context.Set<Product>().Attach(p);
context.Entry(p).State = EntityState.Added;
int result = context.SaveChanges();
if (result>0)
{
return Redirect(Url.Action("Index"));
}
else
{
return Redirect(Url.Action("Error"));
}

}

public ActionResult Update(int id)
{
ViewData.Model= context.Set<Product>().Where(p => p.ProductID == id).FirstOrDefault();
return View();
}

[HttpPost]
public ActionResult Update(Product p)
{
p.CategoryID = 14;
//第一种方法：用curd方法
// context.Set<Product>().AddOrUpdate(p);//需要引用System.Data.Entity.Migrations;

//第二种方法：用状态跟踪
context.Set<Product>().Attach(p);
context.Entry(p).State = EntityState.Modified;
int result = context.SaveChanges();
if (result > 0)
{
return Redirect(Url.Action("Index"));
}
else
{
return Redirect(Url.Action("Error"));
}

}

public ActionResult Delete(int id)
{
var product= context.Set<Product>().Where(p => p.ProductID == id).FirstOrDefault();
//第一种方法：用curd方法
//context.Set<Product>().Remove(obj);

//第二种方法：用状态跟踪
context.Set<Product>().Attach(product);
context.Entry(product).State = EntityState.Deleted;
int result = context.SaveChanges();
if (result > 0)
{
return Redirect(Url.Action("Index"));
}
else
{
return Redirect(Url.Action("Error"));
}
}

public ActionResult Error()
{
return View();
}
}
}

巴特西

MVC CRUD 的两种方法

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