/// <summary>

         /// 对象序列化成 XML String

         /// </summary>

         public static  void XmlSerialize<T>(T obj, string fieldTickefolderName, string fieldTicketName)

         {

             string xmlString = string.Empty;

             System.Xml.Serialization.XmlSerializer xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(T));

             using (MemoryStream ms = new MemoryStream())

             {

                 xmlSerializer.Serialize(ms, obj);

                 xmlString = Encoding.UTF8.GetString(ms.ToArray(), , ms.ToArray().Length);

             }

             XmlDocument xmlDocument = new XmlDocument();

             xmlDocument.LoadXml(xmlString);

             IAsyncOperation<StorageFolder> storageFolder =

                   ApplicationData.Current.LocalFolder.CreateFolderAsync(fieldTickefolderName, CreationCollisionOption.ReplaceExisting);

             IAsyncOperation<StorageFile> xmlStorageFile =

               ApplicationData.Current.LocalFolder.CreateFileAsync(fieldTickefolderName+"\\"+fieldTicketName, CreationCollisionOption.ReplaceExisting);

              xmlDocument.SaveToFileAsync(xmlStorageFile.GetResults());

         }

  ///// <summary>

         ///// XML String 反序列化成对象

         ///// </summary>

         public static async Task<T> XmlDeserialize<T>(string fieldTickefolderName, string fieldTicketName)

         {

             try

             {

                 StorageFolder storageFolder = await ApplicationData.Current.LocalFolder.GetFolderAsync(fieldTickefolderName);

                 StorageFile xmlStorageFile =  await storageFolder.GetFileAsync(fieldTicketName);

                 var stream = await xmlStorageFile.OpenAsync(FileAccessMode.Read);

                 XmlLoadSettings xmlloadsettings = new XmlLoadSettings();

                 xmlloadsettings.ProhibitDtd = false;

                 xmlloadsettings.ResolveExternals = false;

                 XmlDocument doc = await XmlDocument.LoadFromFileAsync(xmlStorageFile, xmlloadsettings);

                 string xmlString = doc.GetXml();

                 T t = default(T);

                 System.Xml.Serialization.XmlSerializer xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(T));

                 using (Stream xmlStream = new MemoryStream(Encoding.UTF8.GetBytes(xmlString)))

                 {

                     using (XmlReader xmlReader = XmlReader.Create(xmlStream))

                     {

                         Object obj = xmlSerializer.Deserialize(xmlReader);

                         t = (T)obj;

                     }

                 }

                 return t;

             }

             catch (Exception ex)

             {

                 throw new Exception(ex.Message);

             }

         }