高级转换:

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);}static void RunQuery(){  XElement project = XElement.Load ("myProjectFile.csproj");  XName 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;  XElement query = new XElement ("Project", ExpandPaths (paths));}