C# 3.0 LINQ to XML

高级转换:
static IEnumerable<XElement> ExpandPaths (IEnumerable<string> 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<XElement> files = from b in brokenUp

                                where b.remainder == null

                                select new XElement ("file", b.name);

  IEnumerable<XElement> 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<string> 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));

}
巴特西

C# 3.0 LINQ to XML

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