Asp.net MVC 3实例学习之ExtShop（四）——完成产品列表页

      在完成产品列表页前要做一些准备功夫。首先是去下载MvcPager用了为产品列表分页。下载的可能是基于MVC 2的，没关系，可以用在MVC 3上。如果有担心，下载源代码重新编译一次好了。下载后将DLL添加到引用里。

      接着是要修改一下路由以实现“Catalog/List/[id]/[page]”的访问。打开“Global.asax.cs”文件，然后在默认路由之前添加以下代码：

1	routes . MapRoute (
2	" Catalog " ,   //   Route   name
3	" Catalog/List/{id}/{page} " ,   //   URL   with   parameters
4	new   {   controller   =   " Catalog " ,   action   =   " List " ,   page   =   1   }   //   Parameter   defaults
5	) ;
6

     现在打开CatalogController.cs文件，在文件头添加对MvcPager的引用，代码如下：

1	using   Webdiyer . WebControls . Mvc;

 

       然后修改Index操作的代码如下：

1	public   ActionResult   Index ( int?   id )
2	{
3	PagedList < T_Products >   q   =   dc . T_Products . OrderByDescending ( m   = >   m . CreateTime ) . ToPagedList ( id   ??   1 ,   8 ) ;
4	return   View ( q ) ;
5	}
6

      代码传入的id是页码而不是产品分类编码，这个要注意。因为要使用分页，所以传递给视图的是PagedList对象，而不是Queryable，这也是要注意的地方。因而，查询结果需要通过toPagedList方法将Queryable对象转换为PagedList对象。第1个参数是当前页面，如果id为空，则默认为第1页。第2个参数是每页显示的产品数量，在这里是8个。

      在“Index”上单击鼠标右键，选择“添加视图”（ ，今天换了中文版，菜单也变了）。在视图中添加以下代码：

1	@ using   Webdiyer . WebControls . Mvc ;
2	@ model   PagedList < Extshop . Models . T_Products >
3
4	@ {
5	ViewBag . Title   =   " 产品列表 " ;
6	PageData [ " id " ]   =   " " ;
7	}
8	< div   class = " nav " >
9	< a   href = " @Url.Action( " " ,   " Catalog " ) " > 产品 < / a >
10	< / div > < br   / >
11	< div   id = " contentMain "   style = " width:760px; " >
12	< span   class = " header "     style = " width:750px; " > 产品列表 < / span >
13	@ {
14	foreach ( var   c   in   Model )
15	{
16	< ul >
17	< li > < a   href = ' @ Url . Action ( " Details " ,   " Product " ,   new   {   id   =   c . ProductID   } ) ' > < img   src = ' / Images / products / @ c . SamllImageUrl '   alt = " @c.Title "   / > < / a > < / li >
18	< li   class = ' title ' > < a   href = ' @ Url . Action ( " Details " ,   " Product " ,   new   {   id   =   c . ProductID   } ) ' > @ c . Title < / a > < / li >
19	< li > 市场价： < del > @ c . MarketPrice . ToString ( " C " ) < / del > < / li >
20	< li > 当前价： @ c . UnitPrice . ToString ( " C " ) < / li >
21	< li > < span   class = " rating-title " > 评 价： < / span >
22	< div   class = ' rating '   id = " @c.ProductID.ToString( " rat - 0 " ) " >
23	< input   name = " @c.ProductID.ToString( " Star0 " ) "   type = " radio "   class = " star "   disabled = " disabled "   value = " 1 "   @ ( c . TotalRating   = =   1   ?   " checked='checked' "   :   " " )     / >
24	< input   name = " @c.ProductID.ToString( " Star0 " ) "   type = " radio "   class = " star "   disabled = " disabled "   value = " 2 "   @ ( c . TotalRating   = =   2   ?   " checked='checked' "   :   " " )   / >
25	< input   name = " @c.ProductID.ToString( " Star0 " ) "   type = " radio "   class = " star "   disabled = " disabled "   value = " 3 "   @ ( c . TotalRating   = =   3   ?   " checked='checked' "   :   " " )     / >
26	< input   name = " @c.ProductID.ToString( " Star0 " ) "   type = " radio "   class = " star "   disabled = " disabled "   value = " 4 "   @ ( c . TotalRating   = =   4   ?   " checked='checked' "   :   " " )     / >
27	< input   name = " @c.ProductID.ToString( " Star0 " ) "   type = " radio "   class = " star "   disabled = " disabled "   value = " 5 "   @ ( c . TotalRating   = =   5   ?   " checked='checked' "   :   " " )     / >
28	< / div >
29	< / li >
30	< / ul >
31	}
32	}
33	< div   class = " clear " > < / div >
34	< div   class = ' pagenav ' > @ Html . Pager ( Model ,   new   PagerOptions   {   PageIndexParameterName   =   " id "   } ) < / div >
35	< / div >
36
37	< script   type = " text/javascript " >
38	jQuery ( function   ( )   {
39	$ ( " div   .rating " ) . stars ( ) ;
40	} ) ;
41	< / script >
42

 

 

      代码第一句引用MvcPager，第二句定义接收的数据模型类型。因为是所以产品列表，所以PageData["id"]设置为空字符串。其余代码和首页的差不多。第34句使用HTML方式显示分页代码。这里要注意的是PagerOptions选项中的PageIndexParameterName要设置为id，因为操作中接收的当前页参数是以id定义的。

      页面需要正常显示，还需要在Site.css中添加以下代码：

1	#contentMain   .clear { clear : both ; }
2	#contentMain   .pagenav { width : 760px ; text-align : center ; margin-bottom : 10px ; }

      切换回CatalogController.cs文件，在Index操作下添加一个List操作，其代码如下：

1	public   ActionResult   List(string   id,   int?   page)
2	{
3	ViewData["id"]   =   id;
4	PagedList   q   =   dc.T_Products
5	.Where(m   =>   dc.T_Categories.Where(n   =>   n.CategoryID.Substring(0,   id.Length)   ==   id).Select(n   =>     n.CategoryID   ).Contains(m.CategoryID))
6	.OrderByDescending(m   =>   m.CreateTime).ToPagedList(page   ??   1,   4);
7	return   View(q);
8	}
9

 

      从代码可以看到，List操作有两个参数，第1个是分类id，第2个是当前页号。第3行通过ViewData["id"]向视图传递当前的分类id，以更新左边分类列表以及显示导航条。其余的和Index操作差不多。现在为List操作创建一个视图，视图内代码如下：

1	@ using   Webdiyer . WebControls . Mvc ;
2	@ model   PagedList < Extshop . Models . T_Products >
3	@ {
4	ViewBag . Title   =   " 产品列表 " ;
5	PageData [ " id " ]   =   ViewData [ " id " ] ;
6	}
7
8	< div   class = " nav " >
9	< a   href = " @Url.Action( " " ,   " Catalog " ) " > 产品 < / a >
10	@ { Html . RenderAction ( " Navbar " ,   " Catalog " ,   new   {   id   =   ViewData [ " id " ]   } ) ; }
11	< / div > < br   / >
12	< div   id = " contentMain "   style = " width:760px; " >
13	< span   class = " header "   style = " width:750px; " > 产品列表 < / span >
14	@ {
15	foreach ( var   c   in   Model )
16	{
17	< ul >
18	< li > < a   href = ' @ Url . Action ( " Details " ,   " Product " ,   new   {   id   =   c . ProductID   } ) ' > < img   src = ' / Images / products / @ c . SamllImageUrl '   alt = " @c.Title "   / > < / a > < / li >
19	< li   class = ' title ' > < a   href = ' @ Url . Action ( " Details " ,   " Product " ,   new   {   id   =   c . ProductID   } ) ' > @ c . Title < / a > < / li >
20	< li > 市场价： < del > @ c . MarketPrice . ToString ( " C " ) < / del > < / li >
21	< li > 当前价： @ c . UnitPrice . ToString ( " C " ) < / li >
22	< li > < span   class = " rating-title " > 评 价： < / span >
23	< div   class = ' rating '   id = " @c.ProductID.ToString( " rat - 0 " ) " >
24	< input   name = " @c.ProductID.ToString( " Star0 " ) "   type = " radio "   class = " star "   disabled = " disabled "   value = " 1 "   @ ( c . TotalRating   = =   1   ?   " checked='checked' "   :   " " )     / >
25	< input   name = " @c.ProductID.ToString( " Star0 " ) "   type = " radio "   class = " star "   disabled = " disabled "   value = " 2 "   @ ( c . TotalRating   = =   2   ?   " checked='checked' "   :   " " )   / >
26	< input   name = " @c.ProductID.ToString( " Star0 " ) "   type = " radio "   class = " star "   disabled = " disabled "   value = " 3 "   @ ( c . TotalRating   = =   3   ?   " checked='checked' "   :   " " )     / >
27	< input   name = " @c.ProductID.ToString( " Star0 " ) "   type = " radio "   class = " star "   disabled = " disabled "   value = " 4 "   @ ( c . TotalRating   = =   4   ?   " checked='checked' "   :   " " )     / >
28	< input   name = " @c.ProductID.ToString( " Star0 " ) "   type = " radio "   class = " star "   disabled = " disabled "   value = " 5 "   @ ( c . TotalRating   = =   5   ?   " checked='checked' "   :   " " )     / >
29	< / div >
30	< / li >
31	< / ul >
32	}
33	}
34	< div   class = " clear " > < / div >
35	< div   class = ' pagenav ' > @ Html . Pager ( Model ,   new   PagerOptions   {   PageIndexParameterName   =   " page "   } ) < / div >
36	< / div >
37
38	< script   type = " text/javascript " >
39	jQuery ( function   ( )   {
40	$ ( " div   .rating " ) . stars ( ) ;
41	} ) ;
42	< / script >
43
44
45

      代码第10行通过一个分部视图显示导航菜单。第35行要注意PageIndexParameterName是“page”，而不是Index视图的“id”了。

      下一步要做的是完成导航条的显示。将文件切换回CatalogController.cs文件，添加一个名称为“Navbar”的子操作，其代码如下：

1	[ ChildActionOnly ]
2	public   ActionResult   Navbar ( string   id )
3	{
4	List < string >   idlist   =   new   List < string > ( ) ;
5	idlist . Add ( id ) ;
6	for   ( int   i   =   0 ;   i   <   ( id . Length   -   2 ) ;   i   =   i   +   3 )
7	{
8	idlist . Add ( id . Substring ( 0 ,   i   +   3 ) ) ;
9	}
10	var   q   =   dc . T_Categories . Where ( m   = >   idlist . Contains ( m . CategoryID ) ) . OrderBy ( m   = >   m . CategoryID ) ;
11	return   PartialView ( q ) ;
12	}
13

 

      代码首先获取了当前分类的父类编号，然后从数据库一次查询出所有类别并排序。现在为该子操作创建一个分部视图，视图代码如下：

1	@ model   IEnumerable < Extshop . Models . T_Categories >
2
3	@ {
4	foreach ( var   c   in   Model )
5	{
6	@ Html . Raw ( " >> " ) < a   href = ' @ Url . Action ( " List " ,   " Catalog " ,   new   { id   =   c . CategoryID     } ) ' > @ c . Titel < / a >
7	}
8	}

 

      代码中，“>>”的显示必须用Html的Raw方法显示，不然会提示错误，使用“>”也不行，估计是和Razor的语法有冲突。是否有其它办法，没去研究了。

      至此，产品列表页的就已经完成了。

     BTW：因为项目还没完成，所以没考虑提供源代码，但有读者希望在看文章的同时能提供源代码做参考，所以从本文开始，每完成一节，就提供到该节的代码。

源代码：http://download.csdn.net/source/2996287