c# multipart/form-data submit programmatically

Question

So got an small problem. Im creating an small application to automate an form submission on one website. But the bad thing is that they are using multipart/form-data for tha

Answer 1

The best way to send multipart form data in C# is shown in the snippet, here you see that adding different type of content is as easy as adding it to the wrapper multipart content type:

var documentContent = new MultipartFormDataContent();
documentContent.Add(new StringContent("AnalyticsPage.xlsx"), "title");
documentContent.Add(new ByteArrayContent(File.ReadAllBytes("C:\\Users\\awasthi\\Downloads\\AnalyticsPage.xlsx")), "file", "AnalyticsPage.xlsx");

Then just make an api call:

using (var client = new HttpClient(new HttpClientHandler() { UseDefaultCredentials = true, CookieContainer = new CookieContainer() }))
{
  response = client.PostAsync(documentAddApi, documentContent).Result;
  var responseContent = response.Content.ReadAsStringAsync().Result;
 }

Here the expectation is that the rest endpoint you are making a call to is accepting a 'title' field for the file and the byte array of the file named 'file'.