How to: Sort Elements on Multiple Keys
This topic shows how to sort on multiple keys.
Example
In this example, the results are ordered first by the shipping postal code, then by the order date.
This example uses the following XML document: Sample XML File: Customers and Orders (LINQ to XML).
XElement co = XElement.Load("CustomersOrders.xml");
var sortedElements =
from c in co.Element("Orders").Elements("Order")
orderby (string)c.Element("ShipInfo").Element("ShipPostalCode"),
(DateTime)c.Element("OrderDate")
select new {
CustomerID = (string)c.Element("CustomerID"),
EmployeeID = (string)c.Element("EmployeeID"),
ShipPostalCode = (string)c.Element("ShipInfo").Element("ShipPostalCode"),
OrderDate = (DateTime)c.Element("OrderDate")
};
foreach (var r in sortedElements)
Console.WriteLine("CustomerID:{0} EmployeeID:{1} ShipPostalCode:{2} OrderDate:{3:d}",
r.CustomerID, r.EmployeeID, r.ShipPostalCode, r.OrderDate);
Dim co As XElement = XElement.Load("CustomersOrders.xml")
Dim result = _
From c In co.<Orders>.<Order> _
Order By c.<ShipInfo>.<ShipPostalCode>.Value, Convert.ToDateTime(c.<OrderDate>.Value) _
Select New With { _
.CustomerID = c.<CustomerID>.Value, _
.EmployeeID = c.<EmployeeID>.Value, _
.ShipPostalCode = c.<ShipInfo>.<ShipPostalCode>.Value, _
.OrderDate = Convert.ToDateTime(c.<OrderDate>.Value) _
}
For Each r In result
Console.WriteLine("CustomerID:{0} EmployeeID:{1} ShipPostalCode:{2} OrderDate:{3:d}", _
r.CustomerID, r.EmployeeID, r.ShipPostalCode, r.OrderDate)
Next
This code produces the following output:
CustomerID:LETSS EmployeeID:1 ShipPostalCode:94117 OrderDate:6/25/1997
CustomerID:LETSS EmployeeID:8 ShipPostalCode:94117 OrderDate:10/27/1997
CustomerID:LETSS EmployeeID:6 ShipPostalCode:94117 OrderDate:11/10/1997
CustomerID:LETSS EmployeeID:4 ShipPostalCode:94117 OrderDate:2/12/1998
CustomerID:GREAL EmployeeID:6 ShipPostalCode:97403 OrderDate:5/6/1997
CustomerID:GREAL EmployeeID:8 ShipPostalCode:97403 OrderDate:7/4/1997
CustomerID:GREAL EmployeeID:1 ShipPostalCode:97403 OrderDate:7/31/1997
CustomerID:GREAL EmployeeID:4 ShipPostalCode:97403 OrderDate:7/31/1997
CustomerID:GREAL EmployeeID:6 ShipPostalCode:97403 OrderDate:9/4/1997
CustomerID:GREAL EmployeeID:3 ShipPostalCode:97403 OrderDate:9/25/1997
CustomerID:GREAL EmployeeID:4 ShipPostalCode:97403 OrderDate:1/6/1998
CustomerID:GREAL EmployeeID:3 ShipPostalCode:97403 OrderDate:3/9/1998
CustomerID:GREAL EmployeeID:3 ShipPostalCode:97403 OrderDate:4/7/1998
CustomerID:GREAL EmployeeID:4 ShipPostalCode:97403 OrderDate:4/22/1998
CustomerID:GREAL EmployeeID:4 ShipPostalCode:97403 OrderDate:4/30/1998
CustomerID:HUNGC EmployeeID:3 ShipPostalCode:97827 OrderDate:12/6/1996
CustomerID:HUNGC EmployeeID:1 ShipPostalCode:97827 OrderDate:12/25/1996
CustomerID:HUNGC EmployeeID:3 ShipPostalCode:97827 OrderDate:1/15/1997
CustomerID:HUNGC EmployeeID:4 ShipPostalCode:97827 OrderDate:7/16/1997
CustomerID:HUNGC EmployeeID:8 ShipPostalCode:97827 OrderDate:9/8/1997
CustomerID:LAZYK EmployeeID:1 ShipPostalCode:99362 OrderDate:3/21/1997
CustomerID:LAZYK EmployeeID:8 ShipPostalCode:99362 OrderDate:5/22/1997
The following example shows the same query for XML that is in a namespace. For more information, see Working with XML Namespaces.
This example uses the following XML document: Sample XML File: Customers and Orders in a Namespace.
XElement co = XElement.Load("CustomersOrdersInNamespace.xml");
XNamespace aw = "https://www.adventure-works.com";
var sortedElements =
from c in co.Element(aw + "Orders").Elements(aw + "Order")
orderby (string)c.Element(aw + "ShipInfo").Element(aw + "ShipPostalCode"),
(DateTime)c.Element(aw + "OrderDate")
select new
{
CustomerID = (string)c.Element(aw + "CustomerID"),
EmployeeID = (string)c.Element(aw + "EmployeeID"),
ShipPostalCode = (string)c.Element(aw + "ShipInfo").Element(aw + "ShipPostalCode"),
OrderDate = (DateTime)c.Element(aw + "OrderDate")
};
foreach (var r in sortedElements)
Console.WriteLine("CustomerID:{0} EmployeeID:{1} ShipPostalCode:{2} OrderDate:{3:d}",
r.CustomerID, r.EmployeeID, r.ShipPostalCode, r.OrderDate);
Imports <xmlns='https://www.adventure-works.com'>
Module Module1
Sub Main()
Dim co As XElement = XElement.Load("CustomersOrdersInNamespace.xml")
Dim result = _
From c In co.<Orders>.<Order> _
Order By c.<ShipInfo>.<ShipPostalCode>.Value, Convert.ToDateTime(c.<OrderDate>.Value) _
Select New With { _
.CustomerID = c.<CustomerID>.Value, _
.EmployeeID = c.<EmployeeID>.Value, _
.ShipPostalCode = c.<ShipInfo>.<ShipPostalCode>.Value, _
.OrderDate = Convert.ToDateTime(c.<OrderDate>.Value) _
}
For Each r In result
Console.WriteLine("CustomerID:{0} EmployeeID:{1} ShipPostalCode:{2} OrderDate:{3:d}", _
r.CustomerID, r.EmployeeID, r.ShipPostalCode, r.OrderDate)
Next
End Sub
End Module
This code produces the following output:
CustomerID:LETSS EmployeeID:1 ShipPostalCode:94117 OrderDate:6/25/1997
CustomerID:LETSS EmployeeID:8 ShipPostalCode:94117 OrderDate:10/27/1997
CustomerID:LETSS EmployeeID:6 ShipPostalCode:94117 OrderDate:11/10/1997
CustomerID:LETSS EmployeeID:4 ShipPostalCode:94117 OrderDate:2/12/1998
CustomerID:GREAL EmployeeID:6 ShipPostalCode:97403 OrderDate:5/6/1997
CustomerID:GREAL EmployeeID:8 ShipPostalCode:97403 OrderDate:7/4/1997
CustomerID:GREAL EmployeeID:1 ShipPostalCode:97403 OrderDate:7/31/1997
CustomerID:GREAL EmployeeID:4 ShipPostalCode:97403 OrderDate:7/31/1997
CustomerID:GREAL EmployeeID:6 ShipPostalCode:97403 OrderDate:9/4/1997
CustomerID:GREAL EmployeeID:3 ShipPostalCode:97403 OrderDate:9/25/1997
CustomerID:GREAL EmployeeID:4 ShipPostalCode:97403 OrderDate:1/6/1998
CustomerID:GREAL EmployeeID:3 ShipPostalCode:97403 OrderDate:3/9/1998
CustomerID:GREAL EmployeeID:3 ShipPostalCode:97403 OrderDate:4/7/1998
CustomerID:GREAL EmployeeID:4 ShipPostalCode:97403 OrderDate:4/22/1998
CustomerID:GREAL EmployeeID:4 ShipPostalCode:97403 OrderDate:4/30/1998
CustomerID:HUNGC EmployeeID:3 ShipPostalCode:97827 OrderDate:12/6/1996
CustomerID:HUNGC EmployeeID:1 ShipPostalCode:97827 OrderDate:12/25/1996
CustomerID:HUNGC EmployeeID:3 ShipPostalCode:97827 OrderDate:1/15/1997
CustomerID:HUNGC EmployeeID:4 ShipPostalCode:97827 OrderDate:7/16/1997
CustomerID:HUNGC EmployeeID:8 ShipPostalCode:97827 OrderDate:9/8/1997
CustomerID:LAZYK EmployeeID:1 ShipPostalCode:99362 OrderDate:3/21/1997
CustomerID:LAZYK EmployeeID:8 ShipPostalCode:99362 OrderDate:5/22/1997