asp.net MVC5--Contains

前言：

* TheContains method is run on the database, not the c# code above. On the database,Containsmaps toSQL LIKE, which is case insensitive.

這句話的意思是Contains()方法，運行在數據庫中，而不是C#代碼上，在數據庫中，Contains就像SQL中的LIKE關鍵字，它是大小寫敏感的。

一：我們來為Index頁面添加一個模糊查詢，在控制器中找到Index方法，修改如下：

 1   public ActionResult Index(string searchString) 2         { 3             4             var movies = from m in db.Movies select m; 5  6             if (!string.IsNullOrEmpty(searchString)) 7             { 8                 movies = movies.Where(s => s.Title.Contains(searchString)); 9             }10             return View(movies);11         }

執行完

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

這句代碼之后，我們偵聽到movies執行的SQL語句為：

1 SELECT   2 [Extent1].[ID] AS [ID],   3 [Extent1].[Title] AS [Title],  4 [Extent1].[ReleaseDate] AS [ReleaseDate],  5 [Extent1].[Genre] AS [Genre],    6 [Extent1].[PRice] AS [Price]  7 FROM [dbo].[Movies] AS [Extent1]

執行完這句之后 movies的SQL語句為：

1 SELECT  2 [Extent1].[ID] AS [ID],    3 [Extent1].[Title] AS [Title],  4 [Extent1].[ReleaseDate] AS [ReleaseDate],   5 [Extent1].[Genre] AS [Genre],   6 [Extent1].[Price] AS [Price]  7 FROM [dbo].[Movies] AS [Extent1]  8 WHERE [Extent1].[Title] LIKE @p__linq__0 ESCAPE N'~'

可以看得出來，Contains方法，生成了Like后面的語句。