#region MD5加密

        /// <summary>

        /// MD5加密

        /// </summary>

        /// <param name="str"></param>

        /// <returns></returns>

        public static string MD5(string str)

        {

            return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5");

        }

        #endregion

        #region 时间转换

        //时间转换成时间戳

        public static int ConvertDateTimeInt(System.DateTime time)

        {

            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(, , ));

            return (int)(time - startTime).TotalSeconds;

        }

        //时间字符串转换成时间戳

        public static int ConvertStringDateTimeInt(string timeStr)

        {

            if (string.IsNullOrEmpty(timeStr) || timeStr.Trim() == "") return ;

            DateTime time = DateTime.ParseExact(timeStr, "yyyyMMddHHmmss", System.Globalization.CultureInfo.InstalledUICulture);

            DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(, , ));

            return (int)(time - startTime).TotalSeconds;

        }

        // 时间戳转为C#格式时间

        public static DateTime StampToDateTime(string timeStamp)

        {

            DateTime dateTimeStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(, , ));

            long lTime = long.Parse(timeStamp + "");

            TimeSpan toNow = new TimeSpan(lTime);

            return dateTimeStart.Add(toNow);

        }

        #endregion

　　　　#region 将字符串使用base64算法加密

        /// <summary>

        /// 将字符串使用base64算法加密

        /// </summary>

        /// <param name="SourceString">待加密的字符串</param>

        /// <param name="Ens">System.Text.Encoding 对象，如创建中文编码集对象：

        /// System.Text.Encoding.GetEncoding("gb2312")</param>

        /// <returns>编码后的文本字符串</returns>

        public static string EncodingString(string SourceString, System.Text.Encoding Ens)

        {

            return Convert.ToBase64String(Ens.GetBytes(SourceString));

        }

        #endregion

        #region 从base64编码的字符串中还原字符串，支持中文

        /// <summary>

        /// 从base64编码的字符串中还原字符串，支持中文

        /// </summary>

        /// <param name="Base64String">Base64加密后的字符串</param>

        /// <param name="Ens">System.Text.Encoding对象，如创建中文编码集对象：

        /// System.Text.Encoding.Default</param>

        /// <returns>还原后的文本字符串</returns>

        public static string DecodingString(string Base64String, System.Text.Encoding Ens)

        {

            return Ens.GetString((Convert.FromBase64String(Base64String)));

        }

        #endregion