C#多部分表单数据httpclient上传csv服务

Question

我有一个windows服务，正在上传一个多部分数据表单在C#。它上传了一个csv，其中包含身份验证变量，形式如下：一个密钥、一个上下文和一个UUID。变量是在自定义标记类中设置的。每次我尝试上传，我得到一个403错误。

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace UploadScheduler.Service
{
    class UploadHttp
    {
        // HttpClient is instantiated once per application
        static readonly HttpClient client = new HttpClient();
        //myUserKey and myUuid are redacted values
        public static string userKey = "myUserKey";
        public static string uuid = "myUuid";

        public static void UploadFile(FileInfo file, Token token, DateTime lwt, DateTime nwt)
        {
            FileInfo fi = new FileInfo(file.FullName);
            string fileName = fi.Name;
            byte[] fileContents = File.ReadAllBytes(fi.FullName);
            Uri webService = new Uri(token.Url);
            HttpRequestMessage requestMessage = new HttpRequestMessage(HttpMethod.Post, webService);
            requestMessage.Headers.ExpectContinue = false;
            HttpWebRequest webRequest = WebRequest.CreateHttp(token.Url);
            webRequest.ServicePoint.Expect100Continue = false;
            MultipartFormDataContent multiPartContent = new MultipartFormDataContent();
            ByteArrayContent byteArrayContent = new ByteArrayContent(fileContents);
            byteArrayContent.Headers.Add("Content-Type", "text/csv");
            multiPartContent.Add(byteArrayContent, "file", fileName);
            multiPartContent.Add(new StringContent(token.Key), "key");
            multiPartContent.Add(new StringContent(token.Context), "context");
            multiPartContent.Add(new StringContent(token.Uuid), "uuid");
            requestMessage.Content = multiPartContent;

            try
            {
                //Task<HttpResponseMessage> httpRequest = client.SendAsync(requestMessage, HttpCompletionOption.ResponseContentRead, CancellationToken.None);
                Task<HttpResponseMessage> httpRequest = client.PostAsync(token.Url, multiPartContent, CancellationToken.None);
                HttpResponseMessage httpResponse = httpRequest.Result;
                HttpStatusCode statusCode = httpResponse.StatusCode;
                HttpContent responseContent = httpResponse.Content;

                if (responseContent != null)
                {
                    Task<String> stringContentsTask = responseContent.ReadAsStringAsync();
                    String stringContents = stringContentsTask.Result;
                    Library.RecordUpload(file, lwt, nwt);
                }
            }
            catch (Exception ex)
            {
                Library.WriteLog("Upload Error: " + file.Name + " " + ex.Message);
                //Library.WriteLog(ex.StackTrace);
            }
        }
    }
}

在我的开发过程中，我创建了自己的S3 bucket，并添加了能够成功上传文件的NuGet AWS S3类。现在我上传到第三方桶，我不断得到一个403错误。谢了！

Answer 1

我使用Postman创建我的请求，然后用RestSharp NuGet包为C#生成代码。

public static void UploadFile(FileInfo file, Token token, DateTime lwt, DateTime nwt)
        {
            string status = "";
            string reason = "";
            try
            {
                var client = new RestClient(token.Url);
                client.Timeout = -1;
                var request = new RestRequest(Method.POST);
                request.AddParameter("key", token.Key);
                request.AddParameter("uuid", token.Uuid);
                request.AddParameter("context", token.Context);
                request.AddFile("file", file.FullName);
                IRestResponse response = client.Execute(request);
                status = response.StatusCode.ToString();
                reason = response.ErrorMessage.ToString();
                Library.RecordUploadSuccess(file, lwt, nwt);
            }
            catch (Exception ex)
            {
                Library.RecordUploadError(file, status, reason);
                //Library.RecordUploadError(file, ex.Message, ex.StackTrace);
            }
        }

强烈建议使用多部分表单数据。