对ASP.NET的Java POST请求失败，C#正常工作

我有一个ASP.NET Web API2应用程序，其中控制器具有：

    public class LicenseController : ApiController
    {
        [Route("license")]
        [HttpPost]
        public XmlDocument PostLicense([FromBody] XmlDocument inputStream)
        {
            XmlDocument doc = new XmlDocument();
            doc.LoadXml("<root/>");
            return doc;
        }
}

我已经尝试更改了发出调用的Java代码的许多设置。为什么不将XML发布到web应用程序控制器

---

谢谢-dave

在编写XML后尝试调用

writer.flush（）

。@VGR-很好。但是我添加了它，它仍然在ASP.NET端给我一个空值。请注意，我已将此添加到上面的代码中。从请求中删除accept charset属性是否会有所不同？@VGR-仍然以null形式出现。我还尝试将内容类型设置为“text/plain”-仍然没有成功；charset=“UTF-8”？（我不认为这会有帮助，但值得一试。）

        static void Main(string[] args)
        {
            string xml = "<david><shirley/></david>";

            Uri httpSite = new Uri(phoneHomeUri + "/license");
            WebRequest wreq = WebRequest.Create(httpSite);
            wreq.UseDefaultCredentials = true;
            wreq.PreAuthenticate = true;
            wreq.Credentials = CredentialCache.DefaultCredentials;
            wreq.Method = "POST";
            wreq.ContentType = "text/xml";

            Stream request = wreq.GetRequestStream();
            byte[] byteArray = Encoding.UTF8.GetBytes(xml);
            request.Write(byteArray, 0, byteArray.Length);
            HttpWebResponse response = (HttpWebResponse) wreq.GetResponse();

            Stream receiveStream = response.GetResponseStream();
            Encoding encode = System.Text.Encoding.GetEncoding("utf-8");
            StreamReader readStream = new StreamReader(receiveStream, encode);
            string s = readStream.ReadToEnd();
}

HttpURLConnection urlConnection = (HttpURLConnection) new URL(phoneHomeUri + "/license").openConnection();
urlConnection.setDoOutput(true);
urlConnection.setDoInput(true);
urlConnection.setChunkedStreamingMode(0);
urlConnection.setRequestMethod("POST");
urlConnection.setRequestProperty("accept-charset", "UTF-8");
urlConnection.setRequestProperty("content-type", "text/xml");

OutputStreamWriter writer = new OutputStreamWriter(urlConnection.getOutputStream(), "UTF-8");
writer.write(xml);
writer.flush();


InputStream result = urlConnection.getInputStream();