DataContext.Entity与DataContext.GetTable<Entity>

我正在ASP.NETMVC应用程序中实现存储库“模式”。因此,我在做一些阅读来决定是应该通过.GetTable公开整个DataContext(在构造函数中初始化),还是只公开表<T>当性能是最重要的因素时。

当我在谷歌搜索时,我在 http://www.codeguru.com/csharp/csharp/net30/article.php/c13799 . 在这段代码中,他首先取出表,然后查询该对象。所以现在我想知道这种方法是否有什么好处。

public void PrintWinners()
{
   // creates a data context that takes the path of the database
   DataContext dc = new DataContext(@"C:\Program Files\
      Microsoft SQL Server\MSSQL.1\MSSQL\Data\UCL.mdf");

   // retrieves a Table of Winner
   Table<Winner> winners = dc.GetTable<Winner>();

   // creates a sequence of winners ordered descending by the
   // winning year
   var result = from w in winners
                orderby w.Year descending
                select w;

   // prints the sequence of winners
   foreach (var w in result)
   {
      Console.WriteLine("{0} {1}, {2}",
      w.Year, w.Name, w.Country);
   }
}