如何:对多个键上的元素排序
更新:November 2007
本主题演示如何对多个键进行排序。
示例
在本示例中,首先按运输邮政编码,然后再按订单日期对结果进行排序。
本示例使用下面的 XML 文档:示例 XML 文件:客户和订单 (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
此代码生成以下输出:
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
下面的示例演示如何对命名空间中的 XML 进行同样的查询。 有关更多信息,请参见使用 XML 命名空间。
本示例使用下面的 XML 文档:示例 XML 文件:命名空间中的客户和订单。
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
此代码生成以下输出:
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