/// <summary>
 /// 从持久化文件 获取 字符串
 /// </summary>
 /// <param name="token">持久化标识</param>
 /// <param name="encoding">编码 (Null表示使用 默认编码)</param>
 /// <param name="securityKey">密钥 (Null表示使用 默认密钥)</param>
 /// <param name="isolatedStorageString">独立存储 字符串 功能 接口</param>
 /// <returns></returns>
 public static string GetString(string token, string securityKey = null, Encoding encoding = null, IIsolatedStorageString isolatedStorageString = null)
 {
     return(GenericityHelper.GetInterface(isolatedStorageString, DefaultIsolatedStorage).GetString(token, securityKey, encoding));
 }
 /// <summary>
 /// 序列化 字符串 到 持久化文件
 /// </summary>
 /// <param name="sourceString">要序列化的字符串</param>
 /// <param name="token">持久化标识</param>
 /// <param name="encoding">编码 (Null表示使用 默认编码)</param>
 /// <param name="securityKey">密钥 (Null表示使用 默认密钥)</param>
 /// <param name="isolatedStorageString">独立存储 字符串 功能 接口</param>
 public static void SaveString(string sourceString, string token, string securityKey = null, Encoding encoding = null, IIsolatedStorageString isolatedStorageString = null)
 {
     GenericityHelper.GetInterface(isolatedStorageString, DefaultIsolatedStorage).SaveString(sourceString, token, securityKey, encoding);
 }