Add Attachment from MultipartContent Stream

To create an attachment in Dynamics 365 CE from a stream in a MultipartContent response, first, check if the HTTP response is successful. Extract the stream from the multipart content, convert it to a byte array, and then create an annotation entity with the base64-encoded PDF content.

Requirement

Create an attachment in Dynamics 365 CE from the stream, which will be available in the MultipartContent response.

Details

Let’s say we are getting MultipartContent in HttpResponse. This response contains a stream that we want to use to create and attach a pdf file in notes. We can use the following code.

if (httReqresponse != null && httReqresponse.IsSuccessStatusCode)
                    {
  var multipartContent = await httReqresponse.Content.ReadAsMultipartAsync();
if (multipartContent != null && multipartContent.Contents.Count > 1)
                                {
                          HttpContent secondPart = multipartContent.Contents[1];
  var streamContent = await secondPart.ReadAsStreamAsync();
 byte[] bytesArrary;
            using (MemoryStream ms = new MemoryStream())
            {
                streamContent.CopyTo(ms);
                bytesArrary= ms.ToArray();
            }
            
                Entity notes = new Entity("annotation");
                notes["objectid"] = new EntityReference("<<Parenentitylookupname>>", <<guid>>);
                notes["objecttypecode"] = "<<Name of parent entity>>";
                notes["subject"] = "Notes Subject";
                notes["documentbody"] = Convert.ToBase64String(bytesArrary);
                //set mimetpe
                notes["mimetype"] = @"application/pdf";
                notes["filename"] = "FileName.pdf";
                service.Create(notes);
            }   
}
}

The code first checks if the HTTP response is not null and if the response status code indicates success. The response content is expected to be in a multipart format, which we are reading asynchronously. Once we have content, we can read the stream and create notes attachments.

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