Error handling for web responses in D365 FO x++

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Posted on by Ammad majid

Hi community members,

I am consuming a Json based API in D365 FO x++. I am using this piece of code while posting the data. It is working fine but the issue when the web response got some errors it does not come into the any catch blocks of the code. I want to show the error message to the user for any bad request like missing items fields but the system only throws the "The error has been thrown by the target of an exception." I have tried many error handling techniques but no solution. Can anyone please guide me what I can try so that the debugger might enter into the catch block of the code.

I can see the errors in the postman.

Thanks

    public void sendFiscal(str _json, CustInvoiceJour _custInvoiceJour)
    {
        str UserAuthToken = 'Authorization';
        str apiKey = 'X-Api-Key';
        str scId = 'X-SdcId';
        CustParameters custParameters = CustParameters::find();
        str apiURL =  custParameters.AXPApiURL; 

        System.Net.HttpWebRequest request;
        System.Net.HttpWebResponse response;
        CLRObject clrObj;
        System.Exception ex;
        System.IO.StreamWriter streamWriter;
        System.Net.WebHeaderCollection httpHeader;
        System.IO.Stream            responseStream;
        System.IO.StreamReader      reader;
        System.ArgumentException    argEx;
        System.Net.WebException     webException;
        str serviceResponse;
        custInvoiceJour custInvoiceJour;
        List listData = new List(Types::Class);
        ListEnumerator listEnumerator;
      
        try
        {
            new InteropPermission(InteropKind::ClrInterop).assert();
            
            httpHeader = new System.Net.WebHeaderCollection();
            httpHeader.Add(apiKey, custParameters.AXPApiKey);
            httpHeader.Add(scId,custParameters.AXPSdcId);

            clrObj = System.Net.WebRequest::Create(apiURL);
            request = clrObj;
            request.set_Headers(httpHeader);
            request.Method = 'POST';
            request.ContentType = 'application/json';

            streamWriter = new System.IO.StreamWriter(request.GetRequestStream());
            streamWriter.Write(_json);
            streamWriter.Flush();
            streamWriter.Close();

            response = request.GetResponse();
            responseStream = response.GetResponseStream();
            reader = new System.IO.StreamReader(responseStream);
    
            serviceResponse = reader.ReadToEnd();
            
            if (response.StatusDescription == 'OK')
            {
                info( strFmt("%1",serviceResponse));
                headerResponse = FormJSONSerializer::deserializeObject(classNum(),serviceResponse);
                info( strFmt("%1",headerResponse.parmInternalData() ));
   
            }
            
            else
            {
                throw error("Something went wrong");
            }
        }

        catch (webException)
        {
            // Handle WebException for error response
            if (webException.get_Response() != null)
            {
                System.Net.HttpWebResponse httpWebResponse;
                Notes                      responseString;
                System.IO.Stream           stream;
                System.IO.StreamReader     streamReader;

                // Get error response stream
                httpWebResponse = webException.get_Response() as System.Net.HttpWebResponse;
                stream = httpWebResponse.GetResponseStream();
                streamReader = new System.IO.StreamReader(stream);
                responseString = streamReader.ReadToEnd();

                // Log the error response body (usually in JSON format)
                error(strFmt("Error Response (JSON): %1", responseString));

                // Close resources
                streamReader.Close();
                stream.Close();
                httpWebResponse.Close();
            }
            else
            {
                // Log the exception message if no response
                error(strFmt("WebException occurred: %1", webException.get_Message()));
            }
        }
        catch (Exception::CLRError)
        {
            ex = CLRInterop::getLastException().GetBaseException();
            throw error(ex.get_Message());
        }
        catch (ex)
        {
            ex = CLRInterop::getLastException().GetBaseException();
            throw error(ex.get_Message());
        }
        catch
        {
            error("Checking!");
        }
    }

Categories:

Dynamics 365 Finance

Error postman.png

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Bharani Preetham Pe... 3,634 Moderator on at

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Error handling for web responses in D365 FO x++

Try adding ExceptionType error and check.

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Martin Dráb 236,552 Most Valuable Professional on at

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Error handling for web responses in D365 FO x++

Please debug your code and tell us what happens there. Maybe you're getting a response and you need to analyze data in serviceResponse variable. Or maybe your catch blocks are completely ignored because the code executes inside a database transaction.

Just by the way, you can simplify your code by declaring variables locally where needed. In Dynamics AX, you had to declare variables on the top of a method, but it's not true anymore in F&O.

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Layan Jwei 8,049 Super User 2025 Season 2 on at

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Error handling for web responses in D365 FO x++

Hi,

can you let us know at which line of code does it fail exactly?

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Ammad majid 44 on at

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Error handling for web responses in D365 FO x++

Hi Layan,

It is failing on the below line of code. After that it must go to the catch block but it is not entering into any catch block.

response = request.GetResponse();

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Martin Dráb 236,552 Most Valuable Professional on at

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Error handling for web responses in D365 FO x++

As I mentioned a month ago, your catch block may be ignored because it's inside a transaction. Use the debugger, stop at the line with GetResponse() and check the value of TtsLevel in the Autos window.

If it's not zero, you have your answer.

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Ammad majid 44 on at

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Error handling for web responses in D365 FO x++

Hi Martin,

Thanks for your reply. I will check the value. But lets assume the value is not zero and we have this thing inside a transaction so what can I do to resolve this issue. I need the code debugger to get into the catch block. Is there some workaround?

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Ammad majid 44 on at

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Error handling for web responses in D365 FO x++

Hi Martin,

On debugging I can verify the Ttslevel = 3. How can I make the code to come in the catch block?

My task is to show the error message to user and the message I placed is in the catch block. So what can I do to achieve it?

Regards,

Ammad

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Martin Dráb 236,552 Most Valuable Professional on at

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Error handling for web responses in D365 FO x++

Your current solution simply can't work.

You'd have to place the catch block outside the transaction, i.e. the top-most transaction needs to be started inside your try block, not the other way around. Your next step is finding where the first transaction starts.

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