XElement config = XElement.Parse ( @"
          
               
       
        30
            
           
               
       
        90
            
       
     "); foreach (XElement child in config.Elements())     child.Name.Dump ("Child element name"); XElement client = config.Element ("client"); bool enabled = (bool) client.Attribute ("enabled");   // Read attribute --client enabled.Dump ("enabled attribute"); client.Attribute ("enabled").SetValue (!enabled);     // Update attribute --True int timeout = (int) client.Element ("timeout");       // Read element--30 timeout.Dump ("timeout element"); client.Element ("timeout").SetValue (timeout * 2);    // Update element client.Add (new XElement ("retries", 3));             // Add new elememt config.Dump ("Updated DOM"); config.Descendants ("client").Count().Dump ("Count of all clients");//2 config.Elements ("client").Count().Dump("Count of Elements");//2 config.FirstNode.Dump ("FirstNode"); config.FirstNode.AddAnnotation ("Hello FirstNode");//增加注释 config.FirstNode.Annotation
     
      ().Dump ("String annotations"); config.FirstNode.RemoveAnnotations
      
       ();//移除注释 config.FirstNode.Annotation
       
        ().Dump ("String annotations"); config.FirstNode.Dump ("Hello FirstNode"); config.LastNode.Dump ("LastNode"); config.FirstNode.AddAfterSelf(new XElement ("client",new XElement ("timeout",120),new XElement ("retries",30))); config.Dump("After calling items.FirstNode.AddAfterSelf"); config.FirstNode.ReplaceWith (new XComment ("client was here")); config.Dump("Notice to change of FirstNode "); config.FirstNode.Remove(); config.Dump("After"); //config.Add(new XElement ("client",new XElement ("timeout", new XText ("12"),new XText ("0")))); config.Add(new XElement ("client",new XAttribute ("id", "IDProperty"),new XElement ("timeout", "12","0"))); config.Dump("After of Add");
       
      
     

StreamingElement

new XStreamingElement ("customers", from c in Customers where c.ID==4 select new XStreamingElement ("customer", new XAttribute ("id", c.ID), new XElement ("name", c.Name), new XElement ("buys", c.Purchases.Count)             )         )

        Result:    

      
       
       
        Mary
        
       
        3
        
       
     

Transforming an X-DOM

 

void Main() {
       XElement project = XElement.Parse (@"     
              
                   
       
        AnyCPU
                    
       
        9.0.11209
                
               
                   
                    
                    
                    
                    
                
           
     ");     XNamespace ns = project.Name.Namespace;     IEnumerable
     
       paths = from compileItem in project.Elements (ns + "ItemGroup").Elements (ns + "Compile")         let include = compileItem.Attribute ("Include") where include != null select include.Value; var query = new XElement ("Project", ExpandPaths (paths));     query.Dump(); } static IEnumerable
      
        ExpandPaths (IEnumerable
       
         paths) {
   var brokenUp = from path in paths         let split = path.Split (new char[] { '\\' }, 2) orderby split[0] select new         {
               name = split[0],             remainder = split.ElementAtOrDefault (1)         };     IEnumerable
        
          files = from b in brokenUp where b.remainder == null select new XElement ("file", b.name);     IEnumerable
         
           folders = from b in brokenUp where b.remainder != null         group b.remainder by b.name into grp select new XElement ("folder", new XAttribute ("name", grp.Key),             ExpandPaths (grp)         ); return files.Concat (folders); }
         
        
       
      
     

 

result:

 

      
      
       ObjectGraph.cs
       
      
       Program.cs
       
       
       
        AssemblyInfo.cs
        
       
       
       
        Aggregation.cs
        
        
        
         RecursiveXml.cs