// need nuget WordPressSharp

internal class FileStore
{
   public IList<Post> Posts { get; private set; }

   public void ReadFiles()
   {
       const string folderPath = @"C:\temp\posts";
       Posts =  new List<Post>();
       var files = Directory.GetFiles(folderPath);

       files.ToList().ForEach(ProcessFile);
   }

   private void ProcessFile(string filepath)
   {
       //Load xml
       XDocument xdoc = XDocument.Load(filepath);

       //Run query
       var posts = from lv1 in xdoc.Descendants("post")
                  select new Post()
                  {
                      Title = lv1.Element("title").Value,
                      Content = lv1.Element("content").Value,
                      PublishDateTime = Convert.ToDateTime(lv1.Element("pubDate").Value),
                      CustomFields = GetDesc(new KeyValuePair<string, string>("Description", lv1.Element("description").Value))
                  };
      posts.ToList().ForEach(Posts.Add);
   }

   public CustomField[] GetDesc(params KeyValuePair<string,string>[] fieldsToAdd)
   {
       var list = new List<CustomField>();
       foreach (var keyValuePair in fieldsToAdd)
       {
           list.Add(new CustomField()
           {
               Id=Guid.NewGuid().ToString(),
               Key=keyValuePair.Key,
               Value = keyValuePair.Value
           });
       }

       return list.ToArray();
   }
}


   private static void Main(string[] args)
        {
            var url = "http://www.mckelt.com/blog/";
            var cfg = new WordPressSiteConfig
            {
                BaseUrl = "/blog/xmlrpc.php",

                BlogId = 1,
                Username = "username",
                Password = "password"
            };


            var fs = new FileStore();
            fs.ReadFiles();

            foreach (var post1 in fs.Posts.OrderBy(x=>x.PublishDateTime))
            {
                post1.Status = "publish";
                using (var client = new WordPressClient(cfg))
                {
                    client.NewPost(post1);
                }
            }
        }
    }