Linq 到 SQL - 如何对查询结果进行排序

Question

我有一个 LINQ 查询我正在检索，尽管在它的上下文中我将如何对 output 进行排序，我尝试过 sortby 等但无济于事

    DataClasses1DataContext db = new DataClasses1DataContext();
    var returnall = from p in db.Orders
                    select p.ShipName;

Answer 1

var returnall = from p in db.Orders
                orderby p.ShipName
                select p.ShipName;

可以在MSDN示例页面上找到各种LINQ函数的便捷参考。

Answer 2

您可以使用OrderBy为单个属性订购多个属性使用ThenBy

 DataClasses1DataContext db = new DataClasses1DataContext();
 var returnall = db.OrderBy(r=> r.OrderDelivaryDate).
                    ThenBy(r => r. OrderName);

此查询将首先按OrderDelivaryDate排序，然后按OrderName

这里有一些简单的linq查询http://msdn.microsoft.com/en-us/vcsharp/aa336756#thenBySimple

Answer 3

var ret = db.Orders.OrderBy( x => x.ShipName );

Answer 4

订购

Answer 5

对一个或多个字段的查询结果进行排序：

数据：

        List<Employee> emp = new List<Employee>() { new Employee() { emp_id = 101, emp_name = "David", emp_lang = "Java", dpt_id = 1 }
                                                    ,new Employee() { emp_id = 102, emp_name = "Lana",emp_lang = "C#", dpt_id = 2 }
                                                    ,new Employee() { emp_id = 103, emp_name = "Sona",emp_lang = "Java", dpt_id = 3 }
                                                    ,new Employee() { emp_id = 104, emp_name = "Mike",emp_lang = "C++", dpt_id = 3 }
                                                    ,new Employee() { emp_id = 105, emp_name = "Roma",emp_lang = "C#", dpt_id = 1 }

询问：

    var res = from e in emp
              orderby e.emp_lang, e.dpt_id
              select new { e.emp_name, e.emp_lang, e.dpt_id }

结果：

{ emp_name = "Roma", emp_lang = "C#", dpt_id = 1 }
{ emp_name = "Lana", emp_lang = "C#", dpt_id = 2 }
{ emp_name = "Mike", emp_lang = "C++", dpt_id = 3 }
{ emp_name = "David", emp_lang = "Java", dpt_id = 1 }
{ emp_name = "Sona", emp_lang = "Java", dpt_id = 3 }