C# Multipart form-data in HttpClient Post REST API
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All, Finally i am able to reproduce the Postman code in C# programmatically.
I able to add the "metadata" property in the multipart form-data.
Reference: Upload Files Using HttpClient
string Seshat_URL = "https://azr-stg.dev03.abs.ase.southcentralus.us.wc.net/files/v11";
using (var multiPartStream = new MultipartFormDataContent())
{
multiPartStream.Add(new StringContent("{}"), "metadata");
multiPartStream.Add(new ByteArrayContent(filecontent, 0, filecontent.Length), "file", docName);
HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, Seshat_URL);
request.Content = multiPartStream;
//"application/json" - content type
request.Headers.Accept.Add(JSON_GENERIC_MEDIA_TYPE);
request.Headers.Add("X-Client-Id", ClientId);
request.Headers.Add("Tenant-Id", TenantId);
HttpCompletionOption option = HttpCompletionOption.ResponseContentRead;
System.Net.ServicePointManager.ServerCertificateValidationCallback = ((sender, certificate, chain, sslPolicyErrors) => true);
using (HttpResponseMessage response = _httpClient.SendAsync(request, option).Result)
{
if (response.IsSuccessStatusCode)
{
var deserializedObject = JsonConvert.DeserializeObject<Wc.MCM.UIMVC.Helpers1.BlobResponse>(response.Content.ReadAsStringAsync().Result);
return deserializedObject.fileId.ToString();
}
}
}//End Try
Author by
AdithyaM
Updated on June 04, 2022Comments
-
AdithyaM over 1 year
Below is the code from Postman. I need to send this Body and Header in the POST Request
var client = new RestClient("https://azr-stg.dev03.abs.ase.southcentralus.us.wc.net/files/v11"); var request = new RestRequest(Method.POST); request.AddHeader("cache-control", "no-cache"); request.AddHeader("Content-Type", "application/pdf"); request.AddHeader("X-Client-Id", "94437320-3bcf-498d-915a"); request.AddHeader("Tenant-Id", "0d3ad0cd-3bb3-4fc0-bd15"); request.AddHeader("content-type", "multipart/form-data; boundary=----WebKitFormBoundary7MA"); request.AddParameter("multipart/form-data; boundary=----WebKitFormBoundary7MA", "------WebKitFormBoundary7MA\r\nContent-Disposition: form-data; name=\"file\"; filename=\"sample.pdf\"\r\nContent-Type: application/pdf\r\n\r\n\r\n------WebKitFormBoundary7MA\r\nContent-Disposition: form-data; name=\"metadata\"\r\n\r\n\r\n------WebKitFormBoundary7MA--", ParameterType.RequestBody); IRestResponse response = client.Execute(request);
The above post is working good in Postman and able to upload the file, but i want to do this in programmatically. The API accepts content types ( like text, pdf, image files ).
how to format the body and header content to send the above with HttpClient request using multipart form-data
Here is where I am with example code for HttpClient. I am getting bad request / internal server error.
HttpClient _httpclient = new HttpClient() using (var multiPartStream = new MultipartFormDataContent()) { MemoryStream stream = new MemoryStream(filecontent); //JsonSerializer.WriteObject(stream, newDocument); ByteArrayContent firstPart = new ByteArrayContent(stream.ToArray()); firstPart.Headers.ContentType = JSON_GENERIC_MEDIA_TYPE; firstPart.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data") { Name = "metadata" }; multiPartStream.Add(firstPart); stream.Dispose(); StreamContent otherContent = new StreamContent(content); otherContent.Headers.ContentType = new MediaTypeHeaderValue(applicationContentType); //otherContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data") { Name = "file" }; otherContent.Headers.Add("Content-Disposition", $"form-data; name=\"file\"; filename=\"{docFullName}\""); multiPartStream.Add(otherContent); HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, urlTwo); request.Content = multiPartStream; request.Headers.Accept.Add(“application/json”); request.Headers.Add("X-Client-Id", "94437320-3bcf-498d-915a"); request.Headers.Add("Tenant-Id", "0d3ad0cd-3bb3-4fc0-bd15"); HttpCompletionOption option = HttpCompletionOption.ResponseContentRead; using (HttpResponseMessage response = _httpClient.SendAsync(request, option).Result) { if (response.IsSuccessStatusCode) { var deserializedObject = JsonConvert.DeserializeObject<Walmart.MDM.MasterUIMVC.Helpers1.RootObject>(response.Content.ReadAsStringAsync().Result); return deserializedObject.properties.r_object_id.ToString(); }
Appreciate any help.