UploadData和UploadFile WebClient

Question

[基本上与此人相同，不幸的是线程在被回答之前就死了。] WebClient's UploadFile and UploadData not sending same headers (with multipart/form-data)

我可以使用WebClients UploadFile上载文件，但是无法使用UploadData上载转换为字节数组的相同文件。

提琴手的不同之处： 在UploadData上：Content-Length：13264

Content-Type：multipart / form-data；边界= --------------------- 8d77fde3018f8e5

关于UploadFile：内容长度：13457

Content-Type：multipart / form-data；边界= --------------------- 8d77fdcfcc453c5

为什么会这样？目前，我拥有的文件存储在内存中，而不是存储在文件中，在本地保存文件实际上不是一种选择。

有人有什么主意吗？

编辑：

var bytes = System.IO.File.ReadAllBytes("dummy.pdf");


    using (WebClient client = new WebClient())
    {
        client.Headers.Add("Access-Token", token);
        client.Headers.Add("Client-Secret", clientSecret);

        client.UploadFile("website", "dummy.pdf");

    }
    string boundary = "---------------------" + DateTime.Now.Ticks.ToString("x");
    var newLine = Environment.NewLine;
    var fileHeaderFormat = "--"+boundary + newLine +
                           "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"" + newLine +
        "Content-Type: application/octet-stream" + newLine + newLine;


    var req = (HttpWebRequest)HttpWebRequest.Create(@"website");
    req.Method = WebRequestMethods.Http.Post;
    req.ContentType = "multipart/form-data; boundary=" + boundary;
    req.Headers.Add("Access-Token", token);
    req.Headers.Add("Client-Secret", clientSecret);
    req.Headers.GetType().InvokeMember("ChangeInternal",
        BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.InvokeMethod,
        Type.DefaultBinder, req.Headers, new object[] { "Connection", "Keep-Alive" }
    );


    using (var reqStream = req.GetRequestStream())
    {
        var reqWriter = new StreamWriter(reqStream);
        var tmp = string.Format(fileHeaderFormat, "file", "dummy.pdf");
        reqWriter.Write(tmp);
        reqWriter.Flush();
        reqStream.Write(bytes, 0, bytes.Length);
    }
    var res = req.GetResponse();
    using (var resStream = res.GetResponseStream())
    {
        var reader = new StreamReader(resStream);
        var t = reader.ReadToEnd();
    }