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MVC项目实践,在三层架构下实现SportsStore-05,实现导航

SportsStore是《精通ASP.NET MVC3框架(第三版)》中演示的MVC项目,在该项目中涵盖了MVC的众多方面,包括:使用DI容器、URL优化、导航、分页、购物车、订单、产品管理、图像上传......是不错的MVC实践项目,但该项目不是放在多层框架下开发的,离真实项目还有一段距离。本系列将尝试在多层框架下实现SportsStore项目,并用自己的方式实现一些功能。

 

本篇为系列第五篇,包括:

■ 8、导航

 

  8、导航

创建NavController,派生于BaseController:

using System.Collections.Generic;using System.Linq;using System.Web.Mvc;using MySportsStore.IBLL;using Ninject;namespace MySportsStore.WebUI.Controllers{    public class NavController : BaseController    {        [Inject]        public IProductService ProductService { get; set; }        public NavController()        {            this.AddDisposableObject(ProductService);        }        public PartialViewResult Menu(string category = null)        {            ViewBag.SelectedCategory = category;            IEnumerable<string> categories =                ProductService.LoadEntities(p => true).Select(p => p.Category).Distinct().OrderBy(p => p);            return PartialView(categories);        }    }}

为什么有category参数?

为了让当前点击、选中的分类高亮显示。这里的category轨迹是:


→前端视图点击分类名称,并把分类名称赋值给路由变量category
→Nav控制器的Menu()方法接收到category,把其放到ViewBag中,再次传回前端视图
→前端视图在遍历所有分类名称的时候,如果当下分类名称与ViewBag中的相同,就为当下分类添加一个CSS,即高亮显示


需要为category赋上一个默认值,因为在点击分类名称之前,category为null。

 

在Nav/Menu.cshtml部分视图中,需要把category和page传递到Product控制器中的Nav()方法中:

@model IEnumerable<string>@Html.ActionLink("Home","List","Product")@foreach (var link in Model){    @Html.RouteLink(link, new {controller = "Product", action = "List", category = link, page = 1},        new {@class = link == ViewBag.SelectedCategory? "selected" : null})}

在Views/Shared下的_Layout.cstml中显示加载分类部分视图:

<!DOCTYPE html><html><head>    <meta charset="utf-8" />    <meta name="viewport" content="width=device-width" />    <title>@ViewBag.Title</title>    <link href=http://www.mamicode.com/"@Url.Content("~/Content/Site.css")" rel="stylesheet" type="text/css" /></head>    <body>        <div id="header">            <div class="title">体育用品商店</div>        </div>        <div id="categories">            @{Html.RenderAction("Menu","Nav");}        </div>        <div id="content">            @RenderBody()        </div>               @Scripts.Render("~/bundles/jquery")        @RenderSection("scripts", required: false)    </body></html>


根据点击分类传递的路由参数,在Product控制器的Nav方法中,还需要考虑到category,再对集合进行筛选。并且,还要考虑当没有点击导航分类名称的时候,category为null:

using System.Web.Mvc;using MySportsStore.IBLL;using MySportsStore.WebUI.Models;using Ninject;namespace MySportsStore.WebUI.Controllers{    public class ProductController : BaseController    {        [Inject]        public IProductService ProductService { get; set; }        public ProductController()        {            this.AddDisposableObject(ProductService);        }        public int PageSize = 4;        public ViewResult List(string category, int page = 1)        {            int totalCount = 0;            ProductsListViewModel viewModel = new ProductsListViewModel()            {                Products = ProductService.LoadPageEntities(p => category == null ? true : p.Category == category, p => p.Id, PageSize, page, out  totalCount, true),                PagingInfo = new PagingInfo(){CurrentPage = page, ItemsPerPage = PageSize, TotalItems = category == null ? ProductService.Count(p => true) : ProductService.Count(p => p.Category == category)},                CurrentCategory = category            };            return View(viewModel);        }    }}

以上,在视图模型ProductsListViewModel中添加了CurrentCategory属性,这个属性值是要交给分页的:

using System.Collections.Generic;using MySportsStore.Model;namespace MySportsStore.WebUI.Models{    public class ProductsListViewModel    {        public IEnumerable<Product>  Products { get; set; }        public PagingInfo PagingInfo { get; set; }        public string CurrentCategory { get; set; }    }}

在Product/List.cshtml视图的分页部分,需要把CurrentCategory值赋值给路由变量category:

@model MySportsStore.WebUI.Models.ProductsListViewModel@{    ViewBag.Title = "List";    Layout = "~/Views/Shared/_Layout.cshtml";}@foreach (var item in Model.Products){   Html.RenderPartial("PrductSummary", item);}<div class="pager">    @Html.PageLinks(Model.PagingInfo, x => Url.Action("List", new {page = x, category = Model.CurrentCategory}))</div>

运行:

13

 

为了让URL更好看,需要考虑如下情境下的URL:

● 运行默认页的时候
● 点击分页的时候
● 点击导航分类的时候
● 点击导航分类后,再点击分页的时候

 

调整URL为:

routes.MapRoute(                null,                "", //匹配空的URL,如"/"                 new{controller = "Product", action = "List", category = (string)null, page = 1}            );            routes.MapRoute(                null,                "Page{page}", //匹配"/Page1",当点击分页的时候                new {controller = "Product", action = "List", category = (string)null},                new {page = @"\d+"} //约束page为数字            );            routes.MapRoute(                null,                "{category}", //匹配 "/Soccer",当点击导航分类的时候                new {controller = "Product", action = "List", page = 1}            );            routes.MapRoute(                null,                "{category}/Page{page}", //匹配"/Soccer/Page1",当点击导航分类,在点击分页的时候                new {controller = "Product", action = "List"},                new {page = @"\d+"}            );


运行:
14

 

“MVC项目实践,在三层架构下实现SportsStore”系列包括:

MVC项目实践,在三层架构下实现SportsStore-01,EF Code First建模、DAL层等

MVC项目实践,在三层架构下实现SportsStore-02,DbSession层、BLL层

MVC项目实践,在三层架构下实现SportsStore-03,Ninject控制器工厂等

MVC项目实践,在三层架构下实现SportsStore-04,实现分页

MVC项目实践,在三层架构下实现SportsStore-05,实现导航

MVC项目实践,在三层架构下实现SportsStore-06,实现购物车

MVC项目实践,在三层架构下实现SportsStore-07,实现订单提交

MVC项目实践,在三层架构下实现SportsStore-08,部署到IIS服务器