三、CustomerSummary

3、CustomerSummary
CustomerSummary

本例跨度比较大，再加上看的是英文版，很多细节没有仔细看明白。
我只是想办法达到了效果，当然也是达到了MVC分层。

按教程，实体类，
CustomerSummary.cs

using System;using System.Collections.Generic;using System.Linq;using System.Web;namespace MVC2_2.Models{    public class CustomerSummary    {        public string Name { get; set; }        public bool Active { get; set; }        public string ServiceLevel { get; set; }        public string OrderCount { get; set; }        public string MostRecentOrderDate { get; set; }    }}

对实体类的操作类 CustomerSummaryManager.cs
这个类，相当于从数据库中读取数据，不过我没写数据库这一块，所以直接在这里写入初始值。

using System;using System.Collections.Generic;using System.Linq;using System.Web;namespace MVC2_2.Models{    public class CustomerSummaryManager    {        public IEnumerable<CustomerSummary> GetAll()        {            List<CustomerSummary> list = new List<CustomerSummary>();            CustomerSummary cs = new CustomerSummary();            cs.Name = "John Smith";            cs.Active = true;            cs.ServiceLevel = "Standard";            cs.OrderCount = "42";            cs.MostRecentOrderDate = DateTime.Now.AddYears(-8).ToString();            list.Add(cs);            cs = new CustomerSummary();            cs.Name = "Susan Power";            cs.Active = false;            cs.ServiceLevel = "Standard";            cs.OrderCount = "1";            cs.MostRecentOrderDate = DateTime.Now.AddYears(-7).ToString();            list.Add(cs);            cs = new CustomerSummary();            cs.Name = "Danny Huang";            cs.Active = true;            cs.ServiceLevel = "Premier";            cs.OrderCount = "7";            cs.MostRecentOrderDate = DateTime.Now.AddYears(-9).ToString();            list.Add(cs);            return list;        }    }}

实际情况，public IEnumerable<CustomerSummary> GetAll()函数，要从数据库中将数据读取出来。

创建Controller和View
CustomSummaryController.cs

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Mvc;using MVC2_2.Models;namespace MVC2_2.Controllers{    public class CustomSummaryController : Controller    {        //        // GET: /CustomSummary/        CustomerSummaryManager _customerSummaries = new CustomerSummaryManager();        public ActionResult Index()        {            IEnumerable<CustomerSummary> summaries = _customerSummaries.GetAll();            return View(summaries);        }    }}

示图Index.aspx

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<IEnumerable<MVC2_2.Models.CustomerSummary>>" %><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>                    Name                </th>                <th>                    Active?                </th>                <th>                    Service Level                </th>                <th>                    Order Count                </th>                <th>                    Most Recent Order Date                </th>            </tr>            <% foreach (var summary in Model)               { %>            <tr>                <td>                    <%=summary.Name%>                </td>                <td>                    <%=summary.Active ? "Yes" : "No"%>                </td>                <td>                    <%=summary.ServiceLevel%>                </td>                <td>                    <%=summary.OrderCount%>                </td>                <td>                    <%=summary.MostRecentOrderDate%>                </td>            </tr>            <%} %>        </table></asp:Content>

注意问题：Inherits="System.Web.Mvc.ViewPage<IEnumerable<MVC2_2.Models.CustomerSummary>>"
一定要加入名字空间MVC2_2.Models
最终结果：
http://localhost:13791/CustomSummary

总结：
对数据的操作并没有包括在MVC中。
数据操作可以定义接口，然后针对不同的数据库实现接口。
虽然我这里是直接赋值 ，但同从数据库里读取道理是相同的。主要是理解MVC这条线的实现过程，可以更深一步扩展，加上数据库，同时加上读取操作。
很关键要理解的是：
IEnumerable<CustomerSummary> summaries = _customerSummaries.GetAll();
            return View(summaries);

传入视图后怎么展现出来：
<% foreach (var summary in Model)
               { %>
            <tr>
                <td>
                    <%=summary.Name%>
...

2011-5-17 15:06 danny

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