MVC项目实践,在三层架构下实现SportsStore-05,实现导航

时间:2021-05-01 06:23:25

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="@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:

MVC项目实践,在三层架构下实现SportsStore-05,实现导航

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:
MVC项目实践,在三层架构下实现SportsStore-05,实现导航

源码在这里

“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,从类图看三层架构

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

MVC项目实践,在三层架构下实现SportsStore-09,ASP.NET MVC调用ASP.NET Web API的查询服务

MVC项目实践,在三层架构下实现SportsStore-10,连接字符串的加密和解密

MVC项目实践,在三层架构下实现SportsStore-11,使用Knockout实现增删改查