c#orderby⽤法class OrderbySample1
{
static void Main()
{
// Create a delicious data source.
string[] fruits = { "cherry", "apple", "blueberry" };
// Query for ascending sort.
IEnumerable<string> sortAscendingQuery =
from fruit in fruits
orderby fruit //"ascending" is default
select fruit;
/
/ Query for descending sort.
IEnumerable<string> sortDescendingQuery =
from w in fruits
orderby w descending
select w;
// Execute the query.
Console.WriteLine("Ascending:");
foreach (string s in sortAscendingQuery)
{
Console.WriteLine(s);
}
/
/ Execute the query.
Console.WriteLine(Environment.NewLine + "Descending:");
foreach (string s in sortDescendingQuery)
{
Console.WriteLine(s);
}
// Keep the console window open in debug mode.
Console.WriteLine("Press any key to exit.");
Console.ReadKey();
}
}
/
* Output:
Ascending:
apple
blueberry
cherry
Descending:
cherry
blueberry
apple
*/
class OrderbySample2
{
// The element type of the data source.
public class Student
{
public string First { get; set; }
public string Last { get; set; }
public int ID { get; set; }
}
public static List<Student> GetStudents()
{
// Use a collection initializer to create the data source. Note that each element        //  in the list contains an inner sequence of scores.
List<Student> students = new List<Student>
{
sort of ordernew Student {First="Svetlana", Last="Omelchenko", ID=111},
new Student {First="Claire", Last="O'Donnell", ID=112},
new Student {First="Sven", Last="Mortensen", ID=113},
new Student {First="Cesar", Last="Garcia", ID=114},
new Student {First="Debra", Last="Garcia", ID=115}
};
return students;
}
static void Main(string[] args)
{
// Create the data source.
List<Student> students = GetStudents();
// Create the query.
IEnumerable<Student> sortedStudents =
from student in students
orderby student.Last ascending, student.First ascending
select student;
// Execute the query.
Console.WriteLine("sortedStudents:");
foreach (Student student in sortedStudents)
Console.WriteLine(student.Last + "" + student.First);
// Now create groups and sort the groups. The query first sorts the names        // of all students so that they will be in alphabetical order after they are
// grouped. The second orderby sorts the group keys in alpha order.
var sortedGroups =
from student in students
orderby student.Last, student.First
group student by student.Last[0] into newGroup
orderby newGroup.Key
select newGroup;
// Execute the query.
Console.WriteLine(Environment.NewLine + "sortedGroups:");
foreach (var studentGroup in sortedGroups)
{
Console.WriteLine(studentGroup.Key);
foreach (var student in studentGroup)
{
Console.WriteLine("  {0}, {1}", student.Last, student.First);
}
}
// Keep the console window open in debug mode
Console.WriteLine("Press any key to exit.");
Console.ReadKey();
}
}
/* Output:
sortedStudents:
Garcia Cesar
Garcia Debra
Mortensen Sven
O'Donnell Claire
Omelchenko Svetlana
sortedGroups:
G
Garcia, Cesar
Garcia, Debra
M
Mortensen, Sven
O
O'Donnell, Claire
Omelchenko, Svetlana
*/

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