x01.Guestbook

留言板（guestbook）比较简单：何人何时留何言。

1.运行 vs2012，选择 MVC 4 模板，输入项目名称：x01.Guestbook，一路默认即可。

2.在项目上右击，从弹出菜单上选择 NuGet 管理器，分别安装 EntityFramwork 和   EntityFramwork.SqlServerCompact，以便使用 DbContext。

3.在 App_Data 文件夹下，创建 Compact 数据库 Guestbook.sdf。表 Entry，字段 Id, Name, Message, Date。

4.在 Models 文件夹下，添加 GuestbookModel.cs 文件，内容如下：

GuestbookModel

using System;

using System.Collections.Generic;

using System.Data.Entity;

using System.Linq;



namespace x01.Guestbook.Models

{

    public class GuestbookContext : DbContext

    {

        public GuestbookContext()

            : base("Guestbook")

        {

        }



        public DbSet<Entry> Entries { get; set; }

    }



    public class Entry

    {

        public int Id { get; set; }

        public string Name { get; set; }

        public string Message { get; set; }

        public DateTime Date { get; set; }

    }



    public interface IGuestbookReponsitory

    {

        IList<Entry> GetEntries();

        Entry Find(int id);

        void Add(Entry entry);

    }



    public class GuestbookReponsitory : IGuestbookReponsitory

    {

        GuestbookContext _context = new GuestbookContext();



        public IList<Entry> GetEntries()

        {

            var result = from e in _context.Entries

                         orderby e.Date descending

                         select e;

            return result.Take(20).ToList();

        }



        public Entry Find(int id)

        {

            var r = _context.Entries.Find(id);

            return r;

        }



        public void Add(Entry entry)

        {

            entry.Date = DateTime.Now;

            _context.Entries.Add(entry);

            _context.SaveChanges();

        }

    }

}

5.在 Controllers 文件夹下，添加 GuestbookController.cs 文件，内容如下：

GuestbookController

using System.Web.Mvc;

using x01.Guestbook.Models;



namespace x01.Guestbook.Controllers

{

    public class GuestbookController : Controller

    {

        IGuestbookReponsitory _reponsitory = new GuestbookReponsitory();



        public ActionResult Index()

        {

            var m = _reponsitory.GetEntries();

            return View(m);

        }



        public ActionResult Add()

        {

            return View();

        }



        [HttpPost]

        public ActionResult Add(Entry entry)

        {

            if (ModelState.IsValid)

            {

                _reponsitory.Add(entry);

                return RedirectToAction("Index");

            }

            return View(entry);

        }



    }

}

6.在 Views/Guestbook 下，添加 Index.cshtml, Add.cshtml 文件，内容如下：

Index

@model IEnumerable<x01.Guestbook.Models.Entry>



@{

    ViewBag.Title = "Index";

}



<h2>Index</h2>



<p>

    @Html.ActionLink("Add Message", "Add")

</p>



<section style="background-color:#fcfcfc; font-size:large;">

    @foreach (var item in Model)

    {

        <p><b>@item.Name (@item.Date.ToString()): </b><br />@item.Message</p>

    }

</section>

Add

@model x01.Guestbook.Models.Entry



@{

    ViewBag.Title = "Add";

}



<h2>Add</h2>



<form method="post">

    Name:

    <br />

    @Html.TextBoxFor(m => m.Name)

    <br />

    Message:

    <br />

    @Html.TextAreaFor(m => m.Message)

    <br />

    <input type="submit" value="Submit" />

</form>

7.修改 Shared/_layout.cshtml 文件中的菜单如下：

<li>@Html.ActionLink("Guestbook","Index","Guestbook")</li>

 按 F5 运行无误，则宣告完成。