如何使用EntityFramework实现复杂的查询操作？

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方法一：使用Linq to Entities查询用户信息，ID为10的用户，并按ID降序输出：csharpvar info=from p in entity.Users where p.ID==10 orderby p.ID descending select p;foreach (var item in info){ Console.WriteLine(ID: + item.ID + 登录名: + item.LoginName + 密码: + item.Pass);}

方法一：Linq to Entitie

var info = from p in entity.Users where p.ID >= 10 orderby p.ID descending select p; foreach (var item in info) { Console.WriteLine("ID:" + item.ID + " " + "登录名:" + item.LoginName + " " + "密码:" + item.Password); }

方法二：Lamada表达式

var info2 = entity.Users.Where<User>(p => p.ID >= 10).OrderByDescending(p => p.ID); foreach (var item in info) { Console.WriteLine("ID:" + item.ID + " " + "登录名:" + item.LoginName + " " + "密码:" + item.Password); }

方法三：Entity SQL Language

var info3 = ((IObjectContextAdapter)entity).ObjectContext.CreateQuery<User>(strSQL); foreach (var item in info) { Console.WriteLine("ID:" + item.ID + " " + "登录名:" + item.LoginName + " " + "密码:" + item.Password); }

方法四：SqlQuery

try { string strSQL2 = "SELECT * FROM Users WHERE ID>=10 ORDER BY ID DESC"; var info4 = entity.Database.SqlQuery<User>(strSQL2); foreach (var item in info) { Console.WriteLine("ID:" + item.ID + " " + "登录名:" + item.LoginName + " " + "密码:" + item.Password); } } catch (Exception ex) { Console.WriteLine(ex.Message); }

到此这篇关于Entity Framework常用查询语句的文章就介绍到这了。希望对大家的学习有所帮助，也希望大家多多支持自由互联。