Question

I want to order a List of objects in C# by many fields, not just by one. For example, let’s suppose I have a class called X with two Attributes, A and B, and I have the following objects, in that order:

object1 => A = “a”, B = “h”
object2 => A = “a”, B = “c”
object3 => A = “b”, B = “x”
object4 => A = “b”, B = “b”

and I want to order the list by A attribute first, and when they are equals, by B element, so the order would be:

“a” “c”
“a” “h”
“b” “b”
“b” “x”

As far as I know, the OrderBy method order by one parameter.

Question: How can I order a C# List by more than one field?

Answer 1

Use ThenBy:

var orderedCustomers = Customer.OrderBy(c => c.LastName).ThenBy(c => c.FirstName)

See MSDN: http://msdn.microsoft.com/en-us/library/bb549422.aspx