ASP.NET MVC5--Contains

前言：

* The Contains  method is run on the database, not the c# code above. On the database, Contains maps to SQL LIKE,  which is case insensitive.

这句话的意思是Contains()方法，运行在数据库中，而不是C#代码上，在数据库中，Contains就像SQL中的LIKE关键字，它是大小写敏感的。

一：我们来为Index页面添加一个模糊查询，在控制器中找到Index方法，修改如下：

  public ActionResult Index(string searchString)
        {
           
            var movies = from m in db.Movies select m;

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

执行完

 var movies = from m in db.Movies select m;

这句代码之后，我们侦听到movies执行的SQL语句为：

SELECT   
[Extent1].[ID] AS [ID],   
[Extent1].[Title] AS [Title],  
[Extent1].[ReleaseDate] AS [ReleaseDate],  
[Extent1].[Genre] AS [Genre],    
[Extent1].[Price] AS [Price]  
FROM [dbo].[Movies] AS [Extent1]

执行完这句之后 movies的SQL语句为：

SELECT  
[Extent1].[ID] AS [ID],    
[Extent1].[Title] AS [Title],  
[Extent1].[ReleaseDate] AS [ReleaseDate],   
[Extent1].[Genre] AS [Genre],   
[Extent1].[Price] AS [Price]  
FROM [dbo].[Movies] AS [Extent1]  
WHERE [Extent1].[Title] LIKE @p__linq__0 ESCAPE N'~'

可以看得出来，Contains方法，生成了Like后面的语句。