返璞归真 asp.net mvc (1) - 添加、查询、更新和删除的 Demo

[索引页]
[源码下载]

返璞归真 asp.net mvc (1) - 添加、查询、更新和删除的 Demo

作者： webabcd


介绍
以Northwind为示例数据库，使用asp.net mvc 1.0实现添加操作、查询操作、更新操作和删除操作


示例
1、 Model（使用ADO.NET Entity Framework做ORM）
CategorySystem.cs（业务逻辑）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace MVC.Models
{
        /**//// <summary>
        /// MVC 之 Model
        /// Category 业务层逻辑
        /// </summary>
         public class CategeorySystem
        {
                // Northwind 的 ObjectContext
NorthwindEntities ctx = new NorthwindEntities() NorthwindEntities ctx = new NorthwindEntities();

                /**//// <summary>
                /// 获取 Category 列表
                /// </summary>
                /// <returns></returns>
List<Categories> GetCategory() List<Categories> GetCategory()
                {
                        return ctx.Categories.ToList();
                }

                /**//// <summary>
                /// 获取 Category 实体
                /// </summary>
                /// <param name= "categoryId">类别 ID</param>
                /// <returns></returns>
Categories GetCategory() Categories GetCategory(int categoryId)
                {
                        return ctx.Categories.FirstOrDefault(p => p.CategoryID == categoryId);
                }
        }
}

ProductSystem.cs（ 业务逻辑）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace MVC.Models
{
        /**//// <summary>
        /// MVC 之 Model
        /// Product 业务层逻辑
        /// </summary>
         public class ProductSystem
        {
                // // Northwind 的 ObjectContext
NorthwindEntities ctx = new NorthwindEntities() NorthwindEntities ctx = new NorthwindEntities();

                /**//// <summary>
                /// 获取产品列表
                /// </summary>
                /// <param name= "pageIndex">页索引</param>
                /// <param name= "pageSize">页大小</param>
                /// <returns></returns>
List<Products> GetProduct() List<Products> GetProduct(int pageIndex, int pageSize)
                {
                        return ctx.Products.OrderBy(p => p.ProductID).Skip(pageIndex * pageSize).Take(pageSize).ToList();
                }

                /**//// <summary>
                /// 获取产品
                /// </summary>
                /// <param name= "productId">产品 ID</param>
                /// <returns></returns>
Products GetProduct() Products GetProduct(int productId)
                {
                        return ctx.Products.FirstOrDefault(p => p.ProductID == productId);
                }

                /**//// <summary>
                /// 新增产品
                /// </summary>
                /// <param name= "product">产品的 Entity</param>
void AddProduct() void AddProduct(Products product)
                {
                        ctx.AddToProducts(product);
                }

                /**//// <summary>
                /// 删除产品
                /// </summary>
                /// <param name= "product">产品的 Entity</param>
void DeleteProduct() void DeleteProduct(Products product)
                {
                        product.Order_Details.Load();
                        ctx.DeleteObject(product);
                }

                /**//// <summary>
                /// 在此对象的上下文中保存修改（增/删/改的操作）
                /// </summary>
void Save() void Save()
                {
                        ctx.SaveChanges();
                }

                /**//// <summary>
                /// 在此对象的上下文中创建 EntityKey
                /// </summary>
                /// <param name= "entitySetName">实体集的名称</param>
                /// <param name= "entity">实体</param>
                /// <returns></returns>
System.Data.EntityKey CreateEntityKey() System.Data.EntityKey CreateEntityKey( string entitySetName, object entity)
                {
                        return ctx.CreateEntityKey(entitySetName, entity);
                }
        }
}

ValidationEntity.cs（合法性验证）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace MVC.Models
{
        /**//// <summary>
        /// 验证信息的实体
        /// </summary>
         public class ValidationEntity
        {
                /**//// <summary>
                /// 验证的错误信息
                /// </summary>
                 public string ErrorMessage { get; set; }
                /**//// <summary>
                /// 产生错误信息的属性名称
                /// </summary>
                 public string PropertyName { get; set; }
                
ValidationEntity() ValidationEntity( string errorMessage)
                {
                        ErrorMessage = errorMessage;
                }

ValidationEntity() ValidationEntity( string errorMessage, string propertyName)
                {
                        ErrorMessage = errorMessage;
                        PropertyName = propertyName;
                }
        }
}

Product.cs（合法性验证）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace MVC.Models
{
        /**//// <summary>
        /// 扩展 Product 实体
        /// 主要是为了对 Product 实体的各个属性做输入的合法性验证
        /// </summary>
         public partial class Products
        {
                List<ValidationEntity> info = new List<ValidationEntity>();

                /**//// <summary>
                /// 对 Product 实体所做的修改是否通过了合法性验证
                /// </summary>
                 public bool IsValid
                {
                         get    
                        {
                                return GetValidation().Count() == 0;
                        }
                }
                
                /**//// <summary>
                /// 返回验证信息列表
                /// </summary>
                /// <returns></returns>
List<ValidationEntity> GetValidation() List<ValidationEntity> GetValidation()
                {
                        return info;
                }

                /**//// <summary>
                /// 重写部分方法 OnProductNameChanging
                /// 用于在 ProductName 属性改变前，对其做合法性验证
                /// </summary>
                /// <param name= "value"></param>
                partial void OnProductNameChanging( string value)
                {
                         if ( string.IsNullOrEmpty(value))
                                info.Add( new ValidationEntity( "请输入产品名称", "ProductName"));
                }

                /**//// <summary>
                /// 重写部分方法 OnUnitPriceChanging
                /// 用于在 UnitPrice 属性改变前，对其做合法性验证
                /// </summary>
                /// <param name= "value"></param>
                partial void OnUnitPriceChanging(global::System.Nullable<decimal> value)
                {
                         if (value == null)
                                info.Add( new ValidationEntity( "请输入单价", "UnitPrice"));
                         else if (((decimal)value) > 100)
                                info.Add( new ValidationEntity( "输入的单价过高", "UnitPrice"));
                }
        }
}

2、 Controller
ProductController.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Mvc.Ajax;

using MVC.Models;

namespace MVC.Controllers
{
        /**//// <summary>
        /// MVC 之 Controller
        /// 这里体现了 Convention over Configuration
        /// Controller 类必须以字符串 Controller 做类名称的结尾，字符串 Controller 之前的字符串为 Controller 的名称，类中的方法名为 Action 的名称
        /// 例如 ProductController, Controller 的名称为：Product；其中的 Action 名称有 Index, Details, Edit 等
        /// </summary>
         public class ProductController : Controller // 需要继承自 System.Web.Mvc.Controller 或者实现 IController 接口
        {
                ProductSystem ps = new ProductSystem();

                // Action 的返回值必须为 ActionResult 或 void    

                /**//// <summary>
                /// 获取 Product 的列表
                /// </summary>
                /// <param name= "pageIndex">页索引</param>
                /// <returns></returns>
ActionResult Index() ActionResult Index(int pageIndex)
                {
                        int pageSize = 10;
                        var products = ps.GetProduct(pageIndex, pageSize);

                        // 此 Action 对应的 View 为（按查找的先后顺序） Views/Product/Index.aspx, Views/Product/Index.ascx, Views/Shared/Index.aspx, Views/Shared/Index.ascx
                        // 其所对应的 View 的关联对象为 products
                        return View( "Index", products);
                }

ActionResult Details() ActionResult Details(int id)
                {
                        var product = ps.GetProduct(id);

                         if (product == null)
                                return View( "NotFound");
                         else
                                // 对应的 View 的名称默认为 Action 的名称，所以此处所对应的 View 的名称为 Details
                                return View(product);
                }

ActionResult Edit() ActionResult Edit(int id)
                {
                        var product = ps.GetProduct(id);

                         if (product == null)
                        {
                                return View( "NotFound");
                        }
                         else
                        {
                                product.CategoriesReference.Load();

                                // 编辑 Product 的时候需要在一个 DropDownList 中选择其所对应的 Category, 所以这里要构造一个名为 CategoryAll 的 ViewData
                                // 因为 Categories 已经是 Product 的属性了，所以这里的 ViewData 的 key 不能为 Categories
                                 if (product.Categories == null)
                                        ViewData[ "CategoryAll"] = new SelectList( new CategeorySystem().GetCategory(), "CategoryId", "CategoryName");
                                 else
                                        ViewData[ "CategoryAll"] = new SelectList( new CategeorySystem().GetCategory(), "CategoryId", "CategoryName", product.Categories.CategoryID);

                                return View( "Edit", product);
                        }
                }

                // 可以用 AcceptVerbs 来声明 Action 所对应的 http 方法
                [AcceptVerbs(HttpVerbs.Post)]
ActionResult Edit() ActionResult Edit(int id, FormCollection formValues)
                {
                        var product = ps.GetProduct(id);

                        // 可以通过这种方式一一为 Product 对象的属性赋值
                        // product.ProductName = Request.Form[ "ProductName"];

                        // 也可以通过 UpdateModel, 让系统自动为属性赋值（通过反射的方式，取得对象的属性名称，然后和 Request 的 key 做匹配，匹配成功的则赋值）
                        UpdateModel<Products>(product);

                        var category = new CategeorySystem().GetCategory(int.Parse(Request.Form[ "MyCategory"]));
                        product.CategoriesReference.EntityKey = ps.CreateEntityKey( "Categories", category);

                        // 通过以下的方式让 UpdateModel 只更新指定属性
                        // string[] allowedProperties = new[] { "ProductName", "UnitPrice" };
                        // UpdateModel(product, allowedProperties);

                         if (!product.IsValid)
                        {
                                foreach (var validation in product.GetValidation())
                                {
                                        // 设置验证信息
                                        ModelState.AddModelError(validation.PropertyName, validation.ErrorMessage);
                                }

                                 if (product.Categories == null)
                                        ViewData[ "CategoryAll"] = new SelectList( new CategeorySystem().GetCategory(), "CategoryId", "CategoryName");
                                 else
                                        ViewData[ "CategoryAll"] = new SelectList( new CategeorySystem().GetCategory(), "CategoryId", "CategoryName", product.Categories.CategoryID);

                                return View(product);
                        }

                        ps.Save();

                        // 跳转到指定的 Action
                        return RedirectToAction( "Details", new { id = product.ProductID });
                }

ActionResult Create() ActionResult Create()
                {
                        Products product = new Products()
                        {
                                ProductName = "请输入产品名称"
                        };

                        return View(product);
                }

                // 可以为参数添加声明，如下例：[Bind(Include = "ProductName")]，客户端提交的数据中，只有 ProductName 会被绑定到 Product 对象上
                // [Bind(Include = "ProductName")] 这样的 attribute 也可以声明在类上，用于指定类中需要被绑定的属性
                [AcceptVerbs(HttpVerbs.Post)]
ActionResult Create() ActionResult Create([Bind(Include = "ProductName")] Products product)
                {
                         if (!product.IsValid)
                        {
                                foreach (var issue in product.GetValidation())
                                {
                                        ModelState.AddModelError(issue.PropertyName, issue.ErrorMessage);
                                }

                                return View(product);
                        }

                        ps.AddProduct(product);
                        ps.Save();

                        return RedirectToAction( "Details", new { id = product.ProductID });
                }

ActionResult Delete() ActionResult Delete(int id)
                {
                        var product = ps.GetProduct(id);

                         if (product == null)
                                return View( "NotFound");
                         else
                                return View(product);
                }

                [AcceptVerbs(HttpVerbs.Post)]
ActionResult Delete() ActionResult Delete(int id, string confirmButton)
                {
                        var product = ps.GetProduct(id);

                         if (product == null)
                                return View( "NotFound");

                        ps.DeleteProduct(product);
                        ps.Save();

                        return View( "Deleted");
                }
        }
}

3、 View（以列表页为例）
Index.aspx

<%@ Page Title= "" Language="C# " MasterPageFile="~/Views/Shared/Site.Master " Inherits="System.Web.Mvc.ViewPage<IEnumerable<MVC.Models.Products>>" %>

<asp:Content ID= "Content1" ContentPlaceHolderID= "TitleContent" runat= "server">
        Index
</asp:Content>
<asp:Content ID= "Content2" ContentPlaceHolderID= "MainContent" runat= "server">
        <h2>
                Index</h2>
        <table>
                <tr>
                        <th>
                        </th>
                        <th>
                                ProductID
                        </th>
                        <th>
                                ProductName
                        </th>
                        <th>
                                UnitPrice
                        </th>
                </tr>
                <%    // 因为本页集成了 System.Web.Mvc.ViewPage<IEnumerable<MVC.Models.Products>>
                        // 所以这里的 Model 就是 System.Web.Mvc.ViewPage<IEnumerable<MVC.Models.Products>> 的 Model 属性
                        foreach (var item in Model)
                        { %>
                <tr>
                        <td>
                                <!--这里的 Html 属性类型为 System.Web.Mvc.HtmlHelper-->
                                <%= Html.ActionLink( "Delete", "Delete", new { id = item.ProductID })%>
                                |
                                <%= Html.ActionLink( "Edit", "Edit", new { id = item.ProductID }) %>
                        </td>
                        <td>
                                <%= Html.ActionLink(item.ProductID.ToString(), "Details", new { id=item.ProductID })%>
                        </td>
                        <td>
                                <%= Html.Encode(item.ProductName) %>
                        </td>
                        <td>
                                <%= Html.Encode( String.Format( "{0:F}", item.UnitPrice)) %>
                        </td>
                </tr>
                <% } %>
        </table>
        <p>
                <%= Html.RouteLink( "上一页", "Products", new { pageIndex = Convert.ToInt32(Html.ViewContext.RouteData.Values[ "pageIndex"]) - 1 })%>
                |
                <%= Html.RouteLink( "下一页", "Products", new { pageIndex = Convert.ToInt32(Html.ViewContext.RouteData.Values[ "pageIndex"]) + 1 })%>
        </p>
</asp:Content>

OK
[源码下载]