此代码使用的是LINQ to XML的color: #ff0000;">函数构造功能创建一个XML树࿰c;其中树中的一些元素是通过LINQ查询结果填充。实际上࿰c;通过本例也可以看到如何使用LINQ to XML将原始XMLclass="tags" href="/tags/CLASS.html" title=class>class="tags" href="/tags/WenDang.html" title=文档>文档转换成为另外一种XMLclass="tags" href="/tags/CLASS.html" title=class>class="tags" href="/tags/WenDang.html" title=文档>文档。
下面代码中使用的PurchaseOrder.class="tags" href="/tags/CLASS.html" title=class>class="tags" href="/tags/XML.html" title=xml>xmlclass="tags" href="/tags/CLASS.html" title=class>class="tags" href="/tags/WenDang.html" title=文档>文档内容：
c</a>ode" <a <a class="tags" href="/tags/C.html" title=c>c</a>lass="tags" href="/tags/CLASS.html" title=<a class="tags" href="/tags/C.html" title=c>c</a>lass><a class="tags" href="/tags/C.html" title=c>c</a>lass</a>="xhtml"><?<a <a <a class="tags" href="/tags/C.html" title=c>c</a>lass="tags" href="/tags/CLASS.html" title=<a class="tags" href="/tags/C.html" title=c>c</a>lass><a class="tags" href="/tags/C.html" title=c>c</a>lass</a>="tags" href="/tags/XML.html" title=xml>xml</a> version="1.0"?> <Pur<a class="tags" href="/tags/C.html" title=c>c</a>haseOrder Pur<a class="tags" href="/tags/C.html" title=c>c</a>haseOrderNumber="99503" OrderDate="1999-10-20"> <Address Type="Shipping"> <Name>Ellen Adams</Name> <Street>123 Maple Street</Street> <City>Mill Valley</City> <State>CA</State> <Zip>10999</Zip> <Country>USA</Country> </Address> <Address Type="Billing"> <Name>Tai Yee</Name> <Street>8 Oak Avenue</Street> <City>Old Town</City> <State>PA</State> <Zip>95819</Zip> <Country>USA</Country> </Address> <DeliveryNotes>Please leave pa<a class="tags" href="/tags/C.html" title=c>c</a>kages in shed by driveway.</DeliveryNotes> <Items> <Item PartNumber="872-AA"> <Produ<a class="tags" href="/tags/C.html" title=c>c</a>tName>Lawnmower</Produ<a class="tags" href="/tags/C.html" title=c>c</a>tName> <Quantity>1</Quantity> <USPri<a class="tags" href="/tags/C.html" title=c>c</a>e>148.95</USPri<a class="tags" href="/tags/C.html" title=c>c</a>e> <Comment>Confirm this is ele<a class="tags" href="/tags/C.html" title=c>c</a>tri<a class="tags" href="/tags/C.html" title=c>c</a></Comment> </Item> <Item PartNumber="926-AA"> <Produ<a class="tags" href="/tags/C.html" title=c>c</a>tName>Baby Monitor</Produ<a class="tags" href="/tags/C.html" title=c>c</a>tName> <Quantity>2</Quantity> <USPri<a class="tags" href="/tags/C.html" title=c>c</a>e>39.98</USPri<a class="tags" href="/tags/C.html" title=c>c</a>e> <ShipDate>1999-05-21</ShipDate> </Item> </Items> </Pur<a class="tags" href="/tags/C.html" title=c>c</a>haseOrder>
示例代码
代码中首先将PurchaseOrder.class="tags" href="/tags/CLASS.html" title=class>class="tags" href="/tags/XML.html" title=xml>xmlclass="tags" href="/tags/CLASS.html" title=class>class="tags" href="/tags/WenDang.html" title=文档>文档的内容通过color: #ff0000;">XDocument.Load()方法加载到内存中࿰c;然后调用XDocument.color: #ff0000;">Descendants()方法找到元素名为Items的所有元素。接着使用函数构造创建了一个XElement对象࿰c;它的内容是由LINQ to XML的查询结果来填充。在查询中࿰c;遍历每一个Items元素࿰c;然后找出这些元素中名为Item的所有子元素。
c</a>ode" <a <a class="tags" href="/tags/C.html" title=c>c</a>lass="tags" href="/tags/CLASS.html" title=<a class="tags" href="/tags/C.html" title=c>c</a>lass><a class="tags" href="/tags/C.html" title=c>c</a>lass</a>="<a class="tags" href="/tags/C.html" title=c>c</a>-sharp">using System; using System.Colle<a class="tags" href="/tags/C.html" title=c>c</a>tions.Generi<a class="tags" href="/tags/C.html" title=c>c</a>; using System.Linq; using System.Text; using System.Xml.Linq; namespa<a class="tags" href="/tags/C.html" title=c>c</a>e Demo03Ex01 { <a <a class="tags" href="/tags/C.html" title=c>c</a>lass="tags" href="/tags/CLASS.html" title=<a class="tags" href="/tags/C.html" title=c>c</a>lass><a class="tags" href="/tags/C.html" title=c>c</a>lass</a> Program { stati<a class="tags" href="/tags/C.html" title=c>c</a> void Main(<a <a <a class="tags" href="/tags/C.html" title=c>c</a>lass="tags" href="/tags/CLASS.html" title=<a class="tags" href="/tags/C.html" title=c>c</a>lass><a class="tags" href="/tags/C.html" title=c>c</a>lass</a>="tags" href="/tags/STRING.html" title=string>string</a>[] args) { XDo<a class="tags" href="/tags/C.html" title=c>c</a>ument Do<a class="tags" href="/tags/C.html" title=c>c</a>ument = XDo<a class="tags" href="/tags/C.html" title=c>c</a>ument.Load(@"C:/LINQ/Pur<a class="tags" href="/tags/C.html" title=c>c</a>haseOrder.<a <a <a class="tags" href="/tags/C.html" title=c>c</a>lass="tags" href="/tags/CLASS.html" title=<a class="tags" href="/tags/C.html" title=c>c</a>lass><a class="tags" href="/tags/C.html" title=c>c</a>lass</a>="tags" href="/tags/XML.html" title=xml>xml</a>"); IEnumerable<XElement> ItemsElements = Do<a class="tags" href="/tags/C.html" title=c>c</a>ument.Des<a class="tags" href="/tags/C.html" title=c>c</a>endants("Items"); XElement OrdersElement = new XElement("Orders", from Items in ItemsElements from Item in Items.Des<a class="tags" href="/tags/C.html" title=c>c</a>endants("Item") sele<a class="tags" href="/tags/C.html" title=c>c</a>t Item); Console.WriteLine(OrdersElement); } } }
运行上面的代码࿰c;会在控制台上输出如下的XML内容࿰c;很明显这和PurchaseOrder.class="tags" href="/tags/CLASS.html" title=class>class="tags" href="/tags/XML.html" title=xml>xml中的格式是有区别的。
c</a>ode" <a <a class="tags" href="/tags/C.html" title=c>c</a>lass="tags" href="/tags/CLASS.html" title=<a class="tags" href="/tags/C.html" title=c>c</a>lass><a class="tags" href="/tags/C.html" title=c>c</a>lass</a>="xhtml"><Orders> <Item PartNumber="872-AA"> <Produ<a class="tags" href="/tags/C.html" title=c>c</a>tName>Lawnmower</Produ<a class="tags" href="/tags/C.html" title=c>c</a>tName> <Quantity>1</Quantity> <USPri<a class="tags" href="/tags/C.html" title=c>c</a>e>148.95</USPri<a class="tags" href="/tags/C.html" title=c>c</a>e> <Comment>Confirm this is ele<a class="tags" href="/tags/C.html" title=c>c</a>tri<a class="tags" href="/tags/C.html" title=c>c</a></Comment> </Item> <Item PartNumber="926-AA"> <Produ<a class="tags" href="/tags/C.html" title=c>c</a>tName>Baby Monitor</Produ<a class="tags" href="/tags/C.html" title=c>c</a>tName> <Quantity>2</Quantity> <USPri<a class="tags" href="/tags/C.html" title=c>c</a>e>39.98</USPri<a class="tags" href="/tags/C.html" title=c>c</a>e> <ShipDate>1999-05-21</ShipDate> </Item> </Orders>