LINQ To XML:重写一个结点的内容Replace

//  we will use this to store a reference to one of the elements in the XML tree. 
XElement firstParticipant; 
 
XDocument xDocument = new XDocument( 
  new XElement("BookParticipants", firstParticipant = 
    new XElement("BookParticipant",  
      new XAttribute("type", "Author"), 
      new XElement("FirstName", "Joe"), 
      new XElement("LastName", "Rattz")))); 
 
Console.WriteLine(System.Environment.NewLine + "Before updating elements:"); 
Console.WriteLine(xDocument); 
 
firstParticipant.ReplaceAll( 
  new XElement("FirstName", "Ewan"), 
  new XElement("LastName", "Buckingham")); 
 
Console.WriteLine(System.Environment.NewLine + "After updating elements:"); 
Console.WriteLine(xDocument); 

输出

Before updating elements: 
<BookParticipants> 
  <BookParticipant type="Author"> 
    <FirstName>Joe</FirstName> 
    <LastName>Rattz</LastName> 
  </BookParticipant> 
</BookParticipants> 
 
After updating elements: 
<BookParticipants> 
  <BookParticipant> 
    <FirstName>Ewan</FirstName> 
    <LastName>Buckingham</LastName> 
  </BookParticipant> 
</BookParticipants>