Microsoft Exception Handling

gistfile1.txt

        // SecuritySafeCritical because it references MessageLockLostException, MessagingCommunicationException, 
        // MessagingEntityAlreadyExistsException, MessagingEntityNotFoundException, ServerBusyException, ServerErrorException
        [SecuritySafeCritical]
        private static bool CheckIsTransient(Exception ex)
        {
            if (ex is FaultException)
            {
                return false;
            }
            else if (ex is MessagingEntityNotFoundException)
            {
                return false;
            }
            else if (ex is MessagingEntityAlreadyExistsException)
            {
                return false;
            }
            else if (ex is MessageLockLostException)
            {
                return false;
            }
            else if (ex is CommunicationObjectFaultedException)
            {
                return false;
            }
            else if (ex is MessagingCommunicationException)
            {
                return true;
            }
            else if (ex is TimeoutException)
            {
                return true;
            }
            else if (ex is WebException)
            {
                return true;
            }
            else if (ex is SecurityTokenException)
            {
                return true;
            }
            else if (ex is ServerTooBusyException)
            {
                return true;
            }
            else if (ex is ServerBusyException)
            {
                return true;
            }
            else if (ex is ServerErrorException)
            {
                return true;
            }
            else if (ex is ProtocolException)
            {
                return true;
            }
            else if (ex is EndpointNotFoundException)
            {
                // This exception may occur when a listener and a consumer are being 
                // initialized out of sync (e.g. consumer is reaching to a listener that 
                // is still in the process of setting up the Service Host). 
                return true;
            }
            else if (ex is CommunicationException)
            {
                return true;
            }
            else if (ex is SocketException)
            {
                var socketFault = ex as SocketException;

                return socketFault.SocketErrorCode == SocketError.TimedOut;
            }
            else if (ex is UnauthorizedAccessException)
            {
                // Need to provide some resilience against the following fault that was seen a few times: 
                // System.UnauthorizedAccessException: The token provider was unable to provide a security token while accessing 'https://mysbns-sb.accesscontrol.windows.net/WRAPv0.9/'.  
                // Token provider returned message: 'Error:Code:500:SubCode:T9002:Detail:An internal network error occured. Please try again.'.  
                // System.IdentityModel.Tokens.SecurityTokenException: The token provider was unable to provide a security token while accessing 'https://mysbns-sb.accesscontrol.windows.net/WRAPv0.9/'.  
                // Token provider returned message: 'Error:Code:500:SubCode:T9002:Detail:An internal network error occured. Please try again.'.  
                // System.Net.WebException: The remote server returned an error: (500) Internal Server Error. 
                var match = acsErrorCodeRegEx.Match(ex.Message);
                var errorCode = 0;

                if (match.Success && match.Groups.Count > 1 && int.TryParse(match.Groups[1].Value, out errorCode))
                {
                    return errorCode == (int)HttpStatusCode.InternalServerError;
                }
            }

            return false;
        }