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  • EF常用查询语句

               //方法一 Linq to Entities
                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
                string strSQL = "SELECT value a FROM Users as a WHERE a.ID>=10 ORDER BY a.ID DESC";
                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);
                }

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  • 原文地址:https://www.cnblogs.com/dotnet261010/p/7249742.html
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