通过HTTPWebRequest发送文件并在web服务器上从$_FILES接收

我的。net应用程序通过HttpWebRequest向web-server发送一个简单的文本文件。但是在web服务器端，我总是得到一个空$_FILES数组。

我读了所有这些问题和文章:

• 使用。net webrequest发布多部分/表单数据
• 使用HTTPWebrequest (multipart/form-data)上传文件
• 如何接收POST数据发送使用" application/octet-stream "在PHP?
• 和PHP手册当然:处理文件上传

下面是测试代码:

public static void UploadFile()
{
    var boundary = "----------------------------" + DateTime.Now.Ticks.ToString("x");
    var httpRequest = (HttpWebRequest)WebRequest.Create(@"https://test.com/upload.php");
    httpRequest.Credentials = CredentialCache.DefaultNetworkCredentials;
    httpRequest.AllowAutoRedirect = true;
    httpRequest.MaximumAutomaticRedirections = 1;
    httpRequest.Method = "POST";
    httpRequest.ContentType = "multipart/form-data; boundary=" + boundary;
    httpRequest.KeepAlive = true;
    using (var requestStream = httpRequest.GetRequestStream())
    {
        var data = Encoding.UTF8.GetBytes("--" + boundary + "'r'n'r'n");
        requestStream.Write(data, 0, data.Length);
        data = Encoding.UTF8.GetBytes("Content-Disposition: form-data; name='"MAX_FILE_SIZE'"'r'n'r'n");
        requestStream.Write(data, 0, data.Length);
        data = Encoding.UTF8.GetBytes("1048576"); // 1Mb
        requestStream.Write(data, 0, data.Length);
        data = Encoding.UTF8.GetBytes("--" + boundary + "'r'n");
        requestStream.Write(data, 0, data.Length);
        data = Encoding.UTF8.GetBytes("Content-Disposition: form-data; name='"uploadedfile'"; filename='"upload.txt'"'r'n");
        requestStream.Write(data, 0, data.Length);
        data = Encoding.UTF8.GetBytes("Content-Type: application/octet-stream'r'n'r'n");
        requestStream.Write(data, 0, data.Length);
        data = File.ReadAllBytes(@"D:'upload.txt");
        requestStream.Write(data, 0, data.Length);
        data = Encoding.UTF8.GetBytes("'r'n--" + boundary + "--");
        requestStream.Write(data, 0, data.Length);
    }
    using (var response = (HttpWebResponse)httpRequest.GetResponse())
    using (var sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
        Console.WriteLine(sr.ReadToEnd());
}

/upload.php:

exit (var_dump($_FILES));

在控制台中输出总是:array(0){}
请帮助。