c# – 使用过期密码防止ODP.net连接打开

我通过调用WCF Web服务来尝试使用提供的用户名和密码打开与数据库的连接.如果连接失败,我捕获异常并向用户返回一条消息,这是登录代码：

[OperationContract]
public LoginResult LogIn(string username,string password,DateTime preventCache)
{
    var result = new List<string>();

    try
    {
       connectionString = ConfigurationManager.ConnectionStrings["SecurityBD"].ToString();
        connectionString = connectionString.Replace("[username]",username);
        connectionString = connectionString.Replace("[password]",passowrd)
        using (var connection = new Oracle.DataAccess.Client.OracleConnection())
        {


            connection.ConnectionString = connectionString;                    
            connection.Open();
            if (connection.State == System.Data.ConnectionState.Open)
            {                        
                connection.Close();
                return new LoginResult(true,GetPermisos(username),preventCache);
            }
            else
            {
                return new LoginResult(false,null,preventCache);
            }
        }

    }
    catch (Oracle.DataAccess.Client.OracleException ex)
    {
        if (ex.Number == 1017)
        {
            return new LoginResult(new SecurityError("Wrong credentials.",ErrorType.InvalidCredentials));
        }
        //Password expired.
        if (ex.Number == 28001)
        {
            return new LoginResult(new SecurityError("Password expired.",ErrorType.PasswordExpired));
        }
        //Acount is locked.
        if (ex.Number == 28000)
        {
            return new LoginResult(new SecurityError("Account is locked.",ErrorType.AccountLocked));
        }
        else
        {
            return new LoginResult(new SecurityError("An error occurred while attempting to connect." + Environment.NewLine + "Error: " + ex.ToString(),ErrorType.UndefinedError));
        }
    }
    catch (Exception exg)
    {
        return new LoginResult(new SecurityError("An error occurred while attempting to connect." + Environment.NewLine + "Error: " + exg.ToString(),ErrorType.UndefinedError));
    }
}

如果连接因密码过期而失败,我会向用户显示相应的消息,然后提示他输入旧密码和新密码,然后将新凭据发送到我的网络服务上的ChangePassword方法.

[OperationContract]      
public ChangePasswordResult ChangePassword(string username,string oldPasswrod,string newPassword)
{
    string connectionString = string.Empty;
    try
    {
                       connectionString = ConfigurationManager.ConnectionStrings["SecurityBD"].ToString();
        connectionString = connectionString.Replace("[username]",passowrd)
        using (var connection = new OracleConnection(connectionString))
        {                    
            connection.Open();
            if (connection.State == System.Data.ConnectionState.Open)
            {                        
                connection.Close();
                using (var newConnection = new Oracle.DataAccess.Client.OracleConnection(connectionString))
                {
                    newConnection.OpenWithNewPassword(Cryptography.TransportDecrypt(newPassword));
                    if (newConnection.State == System.Data.ConnectionState.Open)
                    {

                        return new ChangePasswordResult(null);
                    }
                }
            }
            return new ChangePasswordResult(new SecurityError("Couldn't connect to the database.",ErrorType.UndefinedError));
        }
    }
    catch (OracleException ex)
    {
        if (ex.Number == 1017)
        {
            return new ChangePasswordResult(new SecurityError("Wrong password",ErrorType.InvalidCredentials));
        }
        //Password expired.
        if (ex.Number == 28001)
        {
            using (var newConnection = new Oracle.DataAccess.Client.OracleConnection(connectionString))
            {
                try
                {
                    newConnection.OpenWithNewPassword(Cryptography.TransportDecrypt(newPassword));                            
                    if (newConnection.State == System.Data.ConnectionState.Open)
                    {
                        return new ChangePasswordResult(null);
                    }
                    else
                    {
                        return new ChangePasswordResult(new SecurityError("No se pudo establecer una conexión con la base de datos",ErrorType.UndefinedError));
                    }
                }
                catch (Oracle.DataAccess.Client.OracleException oex)
                {
                    if (oex.Number == 28003)
                        return new ChangePasswordResult(new SecurityError("You'r new password does not match the security requeriments.." + Environment.NewLine + oex.Message,ErrorType.PasswordNotChanged));
                    else
                        return new ChangePasswordResult(new SecurityError(oex.Message,ErrorType.UndefinedError));
                }
            }
        }
        //Acount is locked.
        if (ex.Number == 28000)
        {
            return new ChangePasswordResult(new SecurityError("Account is locked.",ErrorType.AccountLocked));
        }
        else
        {
            return new ChangePasswordResult(new SecurityError("Couldn't establish a connection." + Environment.NewLine + "Error: " + ex.Message,ErrorType.UndefinedError));
        }
    }
    catch
    {
        throw;
    }
}

执行更改密码操作后,用户仍然可以使用旧密码连接,并且无法使用新密码进行连接.只有在我重新启动应用程序后,更改才会生效.

我正在使用oracle的ODP.net驱动程序.使用Microsoft的oracle客户端,用户可以在密码更改后连接新密码和旧密码.

preventCache参数仅用于验证没有类型的客户端缓存.我从客户端发送当前日期,然后从Web服务返回相同的值,以查看它是否随后的请求实际更改,并且它按预期执行.

我已经尝试监听连接的InfoMessage事件,看看是否有任何警告,但这样做可以防止密码过期异常上升,代码永远不会到达eventHandler.

我完全迷失了,这种行为对我来说似乎很奇怪,我仍然没有找出问题的根本原因.

我试过在桌面(WPF)应用程序上复制LogIn和ChangePassword方法,它的行为完全相同.所以我想问题不在于Silverlight客户端.