SolarWinds API - Attachment is uploading but not associating to parent

Question

I'm trying to upload an attachment to an existing incident using the API. I can see I'm receiving a 201 HTTP status; however, when I look at the incident on SolarWinds no attachment is showing. The attachment exists though, and I'm able to navigate to it but no association/relationship. 
 HttpClient client = new HttpClient();
 HttpRequestMessage message = new HttpRequestMessage();

FileStream f = File.Open(attachment.AttachmentContent.Path, FileMode.Open);
 
 MultipartFormDataContent form = new MultipartFormDataContent();
 form.Add(new StringContent(attachment.AttachmentContent.Type), "file[attachable_type]");
 form.Add(new StringContent($"file[attachable_id]={Convert.ToInt32(attachment.AttachmentContent.Number)}"));
 form.Add(new StreamContent(f), "file[attachment]", Path.GetFileName(attachment.AttachmentContent.Path));

message.RequestUri = new Uri(url);
 message.Content = form;
 message.Method = HttpMethod.Post;

client.DefaultRequestHeaders.Add("X-Samanage-Authorization", "Bearer " + AuthenticationToken);
 HttpResponseMessage response = client.SendAsync(message).Result;
 LastResponse = response;

if (!response.IsSuccessStatusCode) throw new ApplicationException("Didn't receive OK 200");
 return response.Content.ReadAsStringAsync().Result; 
 I'm baffled now and out of ideas. I hope someone is able to assist. Note: I've put this in the wrong forum previously, not a repeat I'll be deleting the other one shortly.

robertholland94 · Accepted Answer

Hi Rinat, I've managed to resolve the issue. It looks like it was something I did wrong. New code attached below. HttpClient client = new HttpClient();
 HttpRequestMessage message = new HttpRequestMessage();

FileStream f = File.Open(attachment.AttachmentContent.Path, FileMode.Open);

MultipartFormDataContent form = new MultipartFormDataContent();
 form.Add(new StringContent(attachment.AttachmentContent.Type), "file[attachable_type]");
 form.Add(new StringContent(attachment.AttachmentContent.Number), "file[attachable_id]");
 form.Add(new StreamContent(f), "file[attachment]", attachment.AttachmentContent.Path);

message.RequestUri = new Uri(url);
 message.Content = form;
 message.Method = HttpMethod.Post;

client.DefaultRequestHeaders.Add("X-Samanage-Authorization", "Bearer " + AuthenticationToken);
 client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/vnd.samanage.v1.3+json"));

HttpResponseMessage response = client.SendAsync(message).Result;
 LastResponse = response;

if (!response.IsSuccessStatusCode) throw new ApplicationException("Didn't receive OK 200");
 return response.Content.ReadAsStringAsync().Result;

SolarWinds API - Attachment is uploading but not associating to parent

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