public static string GetConDb(string filter, string Dbname){string Reaconn = "";string constr = "Data Source=.;Initial Catalog=IBBC;Integrated Security=SSPI;";string sqlstr = "SELECT * FROM IBBC.dbo.Table_1 where temp1='"+filter+"' and  temp2='"+Dbname+"'";SqlConnection con = new SqlConnection(constr);SqlCommand cmd = new SqlCommand(sqlstr, con);con.Open();try{SqlDataReader sdr = cmd.ExecuteReader();while (sdr.Read()){//此处获取对应的整个sql身份验证的连接字符串string bb = sdr[1].ToString();string[] connecstr = bb.Split();for (int i = 0; i < connecstr.Length; i++){//判断是否匹配到数组中的的密码if (connecstr[i].Contains("Password")){//获取带密码的字符串长度，比如：Password=Xeferfa0=长度为18int GrossPwdlth = connecstr[i].Length;//获取Password=后面的加密字符string RevertoldPwd = connecstr[i].Substring(9, GrossPwdlth - 9);//将获取到的密码密文进行解密string newpwd = DecryptDES(RevertoldPwd, UUkey);//将密文密码替换成明文密码bb = bb.Replace(RevertoldPwd, newpwd);}}Reaconn = bb;}return Reaconn;}catch (Exception ex){throw new Exception(ex.Message); ;}finally {con.Close();        }      }

    private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };//密钥private static string UUkey = "********";/**//**//**//// <summary>/// DES加密字符串/// </summary>/// <param name="encryptString">待加密的字符串</param>/// <param name="encryptKey">加密密钥,要求为8位</param>/// <returns>加密成功返回加密后的字符串，失败返回源串</returns>public static string EncryptDES(string encryptString, string encryptKey){try{byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));byte[] rgbIV = Keys;byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();MemoryStream mStream = new MemoryStream();CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);cStream.Write(inputByteArray, 0, inputByteArray.Length);cStream.FlushFinalBlock();return Convert.ToBase64String(mStream.ToArray());}catch{return encryptString;}}/**//**//**//// <summary>/// DES解密字符串/// </summary>/// <param name="decryptString">待解密的字符串</param>/// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>/// <returns>解密成功返回解密后的字符串，失败返源串</returns>public static string DecryptDES(string decryptString, string decryptKey){try{byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);byte[] rgbIV = Keys;byte[] inputByteArray = Convert.FromBase64String(decryptString);DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();MemoryStream mStream = new MemoryStream();CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);cStream.Write(inputByteArray, 0, inputByteArray.Length);cStream.FlushFinalBlock();return Encoding.UTF8.GetString(mStream.ToArray());}catch{return decryptString;}}