通过 HtppClient Post 请求发送超过 1 个文件 c#

Question

I'm currently working with an API and I have to send files thanks to http post protocol.

With postman, everithing works fine and I can send an array of files that can contains more than 1 file:

For that, I'm using HttpClient in my c# application, but I only can send one file. Moreover, my body must contains form-data body so I created a MultipartFormDataContent object for send my file.

public async Task<SubmitIdentityResults> SubmitIdentity(Guid companyId, DocumentTypes docType, SubmitIdentityParameters submitIdentityParameters)
        {
            try
            {
                var accesstoken = await _authTokenFromClientID.GetAccessToken();
                var client = _httpClientFactory.CreateClient("MyClient");
                client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("bearer", accesstoken);


                MultipartFormDataContent form = new MultipartFormDataContent();
                form.Add(new StreamContent(submitIdentityParameters.File!), "Files", submitIdentityParameters.FileName!);

                var response = await client.PostAsync($"api/Document/{docType.ToString()}", form);

                if (response.StatusCode == System.Net.HttpStatusCode.NoContent)
                {
                    return default(SubmitIdentityResults)!;
                }
                return await response.Content.ReadFromJsonAsync<SubmitIdentityResults>() ?? default(SubmitIdentityResults)!;

            }
            catch (Exception)
            {
                throw;
            }
        }

There is a way to develop the same bahaviour in c# with httpclient and mulitipartformdata?

Answer 1

I think you should pass an array SubmitIdentityParameters[] submitIdentityParameters and do like this.

foreach (var file in submitIdentityParameters)
{
    form.Add(new StreamContent(file.File!), "Files", file.FileName!);
}