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