总结Movies MVC3教程示例的知识点

一、web.cofnig数据库连接

<add name="MovieDBContext"
connectionString="Data Source=.;Initial Catalog=Movies;Integrated Security=True"
providerName="System.Data.SqlClient"/>

 二、初始化数据库及数据

using System.ComponentModel.DataAnnotations;

在Model类的Movie.cs里添加引用和下面的初始类

public class movieInitializer:DropCreateDatabaseIfModelChanges<MovieDBContext>
{
 protected override void Seed(MovieDBContext context)
 {
 var movies=new List<Movie>
  {
   new Movie{Title="when harry met sally",
                   Price=4.6M},
   new Movie{Title="Ghost",
                   Price=200.0M},
  };
  movies.ForEach(d=>context.Movies.Add(d));
 }
}

 然后在Global.asax.cs的protected void Application_Start()里添加如下代码：

Database.SetInitializer<MovieDBContext>(new MovieInitializer());

 三、添加MoviesControllers

Details注意ViewResult要改成：ActionReuslt因为我们要加个HttpNotFound而它是不能返回ViewResult对象的

 public ActionResult  Details(int id=0)
        {
            Movie movie = db.Movies.Find(id);
            if (movie == null)
            {
                return HttpNotFound();
            }
            return View(movie);
        }

象Edit和Delte最好给一个初始值，以防提交的ID是空的

public ActionResult Edit(int id=2)
        {
            Movie movie = db.Movies.Find(id);
            if (movie == null)
            {
                return HttpNotFound();
            }
            return View(movie);
        }

Mvc3改进了删除功能，加上了删除确认，目的是防止恶意代码没有经过确认就删除数据

当点击删除连接时只是返回确认信息：

 public ActionResult Delete(int id)
        {
            Movie movie = db.Movies.Find(id);
            return View(movie);
        }

再点击确认按钮进行post提交删除

a)请注意查看View里的Delete.cshtml文件删除源文件：

@using (Html.BeginForm()) {
    <p>
        <input type="submit" value="Delete" /> |
        @Html.ActionLink("Back to List", "Index")
    </p>

b)在生成html的确认删除源文件里可以看到自动生成了action="/movies/Delete/1：

<form action="/movies/Delete/1" method="post">    <p>
        <input type="submit" value="Delete" /> |
        <a href="/movies">Back to List</a>
    </p>
</form>

下面是确认删除后执行的动作：

[HttpPost, ActionName("Delete")]
        public ActionResult DeleteConfirmed(int id=0)
        {            
            Movie movie = db.Movies.Find(id);
            if (movie == null)
            {
                return HttpNotFound();
            }
            db.Movies.Remove(movie);
            db.SaveChanges();
            return RedirectToAction("Index");
        }

四、内容搜索过滤功能

先来看SearchIndex.cshtml视图页:

 @using (Html.BeginForm("SearchIndex", "Movies", FormMethod.Get))
    { 
        <p>Genre:@Html.DropDownList("movieGenre","All")</p>
        <p>Title:@Html.TextBox("SearchString") <input type="submit" value="Filter" /></p>
    
    }

下面是Controller:

public ActionResult SearchIndex(string movieGenre,string searchString)
        {
            var GenreLst = new List<string>();
            var GenreQry = from d in db.Movies orderby d.Genre select d.Genre;

            GenreLst.AddRange(GenreQry.Distinct());
            ViewBag.movieGenre = new SelectList(GenreLst);
            var movies = from m in db.Movies select m;

            if (!String.IsNullOrEmpty(searchString))
            {
                movies = movies.Where(s => s.Title.Contains(searchString));
            }

            if (string.IsNullOrEmpty(movieGenre))
                return View(movies);
            else
            {
                return View(movies.Where(x => x.Genre == movieGenre));
            }
        }

下面是生成的html页面源代码：

<form action="/Movies/SearchIndex" method="get">        
Genre:
<select id="movieGenre" name="movieGenre">
  <option value="">All</option>
  <option>comedy</option>
  <option>Romanti Comedy</option>
</select>

<p>Title:<input id="SearchString" name="SearchString" type="text" value="" /> <input type="submit" value="Filter" /></p>
</form>

五、Movie类和数据库连接上下文类MovieDBContext,注意引用using System.Data.Entity;

using System.Data.Entity;
public class Movie
{
 public int ID{get;set;}
 public string Title{get;set;}
 public decimal Price{get;set;}
}
public class MovieDBContext:DbContext
{
 public DbSet<Movie> Movies{get;set;}
}

六、字段规则确认验证

public int ID { get; set; }
[Required(ErrorMessage="标题必需要填写")]
public string Title { get; set; }
[Required(ErrorMessage="Price Required")]
[Range(1,100,ErrorMessage="Price must be between $1 and $100")]
[DisplayFormat(DataFormatString="{0:c}")]
public decimal Price { get; set; }