MD5加密、時間戳轉換、base64算法加密、解密

        #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 時間轉換
        //時間轉換成時間戳
        public static int ConvertDateTimeInt(System.DateTime time)
        {
            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));
            return (int)(time - startTime).TotalSeconds;
        }

        //時間字符串轉換成時間戳
        public static int ConvertStringDateTimeInt(string timeStr)
        {
            if (string.IsNullOrEmpty(timeStr) || timeStr.Trim() == "0") return 0;
            DateTime time = DateTime.ParseExact(timeStr, "yyyyMMddHHmmss", System.Globalization.CultureInfo.InstalledUICulture);
            DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));
            return (int)(time - startTime).TotalSeconds;
        }
        // 時間戳轉為C#格式時間
        public static DateTime StampToDateTime(string timeStamp)
        {
            DateTime dateTimeStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
            long lTime = long.Parse(timeStamp + "0000000");
            TimeSpan toNow = new TimeSpan(lTime);
            return dateTimeStart.Add(toNow);
        }
        #endregion

　　　　#region 將字符串使用base64算法加密
        /// <summary> /// 將字符串使用base64算法加密 /// </summary> /// <param name="SourceString">待加密的字符串</param> /// <param name="Ens">System.Text.Encoding 對象，如創建中文編碼集對象： /// System.Text.Encoding.GetEncoding("gb2312")</param> /// <returns>編碼后的文本字符串</returns> public static string EncodingString(string SourceString, System.Text.Encoding Ens) { return Convert.ToBase64String(Ens.GetBytes(SourceString)); } #endregion #region 從base64編碼的字符串中還原字符串，支持中文 /// <summary> /// 從base64編碼的字符串中還原字符串，支持中文 /// </summary> /// <param name="Base64String">Base64加密后的字符串</param> /// <param name="Ens">System.Text.Encoding對象，如創建中文編碼集對象： /// System.Text.Encoding.Default</param> /// <returns>還原后的文本字符串</returns> public static string DecodingString(string Base64String, System.Text.Encoding Ens) { return Ens.GetString((Convert.FromBase64String(Base64String))); } #endregion