/// <summary>
        /// 使用指定的加密算法、用随机密钥加密字符串
        /// </summary>
        /// <param name="Source">要加密的字符串</param>
        /// <returns>加密结果</returns>
        public string Encrypting(string Source,string Key)
        {
            #region temp
            string strTemp = Key;
            if(strTemp.Length * 8 > objCryptoService.LegalKeySizes[0].MaxSize)
            {
                // 如果密钥长度太长得话，截
                strTemp = strTemp.Substring(0,objCryptoService.LegalKeySizes[0].MaxSize / 8);
            }
            if(strTemp.Length * 8 < objCryptoService.LegalKeySizes[0].MinSize)
            {
                // 如果密钥长度太短得的话，在右边补空格
                strTemp = strTemp.PadRight(objCryptoService.LegalKeySizes[0].MinSize / 8);
            }
            if(objCryptoService.LegalKeySizes[0].SkipSize != 0 && (strTemp.Length * 8) % objCryptoService.LegalKeySizes[0].SkipSize != 0)
            {
                // 如果密钥长度不是密钥长度间隔单位的倍数，则补空格。
                strTemp = strTemp.PadRight(objCryptoService.LegalKeySizes[0].MaxSize / 8);
            }

            byte[] _Key = System.Text.Encoding.Default.GetBytes(strTemp);
            objCryptoService.Key = _Key;
            objCryptoService.IV = _Key;
            #endregion

            // 创建内存中的数据流
            System.IO.MemoryStream objMemoryStream = new System.IO.MemoryStream();

            // 创建加密器
            ICryptoTransform objEncryptor = objCryptoService.CreateEncryptor();

            // 创建加密转换文件流的加密流
            CryptoStream objCryptoStream = new CryptoStream(objMemoryStream, objEncryptor, CryptoStreamMode.Write);

            StreamWriter writer = new StreamWriter(objCryptoStream);
            writer.Write(Source);
            writer.Flush();
            objCryptoStream.FlushFinalBlock();

            // 获取输出
            byte[] bytOut = new byte[objMemoryStream.Length];
            objMemoryStream.Position = 0;
            objMemoryStream.Read(bytOut,0,bytOut.Length);

            string strDest = System.Convert.ToBase64String(bytOut);

            objCryptoService.Clear();
            objMemoryStream.Close();
            writer.Close();

            return strDest;
        }