Asp.net Silverlight从处理程序接收响应

我有一个Silverlight应用程序，它位于网页上。它允许用户将多个文档上载到服务器。当我开始将文档上传到服务器时，我会通过POST请求调用处理程序，如果文件太大，我会将其分块发送，代码如下：

private void UploadFileEx()
{
    Status = FileUploadStatus.Uploading;
    var temp = FileLength - BytesUploaded;

    var ub = new UriBuilder(_urlServer);
    var complete = temp <= ChunkSize;

    ub.Query = string.Format("{3}locationCode={4}&filename={0}&StartByte={1}&Complete={2}", RockDocumentName, BytesUploaded, complete,
                                string.IsNullOrEmpty(ub.Query) ? string.Empty : string.Format("{0}&", ub.Query.Remove(0, 1)), _locationCode);

    var webrequest = (HttpWebRequest) WebRequest.Create(ub.Uri);
    webrequest.Method = "POST";

    // Begins an asynchronous request for a Stream object to use to write data.
    // The asynchronous callback method uses the EndGetRequestStream method to return the actual stream.
    // This means
    webrequest.BeginGetRequestStream(WriteCallback, webrequest);
}

private void WriteCallback(IAsyncResult asynchronousResult)
{
    var webrequest = (HttpWebRequest) asynchronousResult.AsyncState;
    // End the operation.
    // Here we obtain the stream to write the request
    var requestStream = webrequest.EndGetRequestStream(asynchronousResult);

    var buffer = new Byte[4096];
    int bytesRead;
    var tempTotal = 0;

    Stream fileStream = File.OpenRead();

    fileStream.Position = BytesUploaded;
    while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0 && tempTotal + bytesRead < ChunkSize)
    {
        requestStream.Write(buffer, 0, bytesRead);
        requestStream.Flush();
        BytesUploaded += bytesRead;
        tempTotal += bytesRead;

        if (UploadProgressChanged != null)
        {
            var percent = (int) ((BytesUploaded/(double) FileLength)*100);
            var args = new UploadProgressChangedEventArgs(percent, bytesRead, BytesUploaded, FileLength,
                                                            RockDocumentName);
            Dispatcher.BeginInvoke(() => UploadProgressChanged(this, args));
        }
    }

    fileStream.Close();
    requestStream.Close();

    // Whenever the operation is ready call the ReadCallback method (when this method
    // is called we know that the chunk of file has arrived successfully to the server,
    // it's time to process the next chunk).
    webrequest.BeginGetResponse(ReadCallback, webrequest);
}

这不像我想的那样有效。我做错了什么？我在处理程序中设置的标题是否错误？我的处理程序是否有其他方式与Silverlight客户端应用程序对话

---

任何帮助都将不胜感激。提前谢谢

如果处理程序将文档名作为响应正文的一部分而不是作为标题发回，您可能会更幸运

尝试以下代码，看看您得到了什么：

private void ReadCallback(IAsyncResult asynchronousResult)
{
    var webRequest = (HttpWebRequest) asynchronousResult.AsyncState;
    var webResponse = (HttpWebResponse) webRequest.EndGetResponse(asynchronousResult);
    var reader = new StreamReader(webResponse.GetResponseStream());
    var documentName = reader.ReadToEnd();
    reader.Close();


    if (BytesUploaded < FileLength)
        UploadFileEx();
    else
    {
        DocumentName = documentName;
        Status = FileUploadStatus.Complete;
    }
}

---

如果处理程序将文档名作为响应体的一部分而不是作为标题发回，您可能会更幸运

尝试以下代码，看看您得到了什么：

private void ReadCallback(IAsyncResult asynchronousResult)
{
    var webRequest = (HttpWebRequest) asynchronousResult.AsyncState;
    var webResponse = (HttpWebResponse) webRequest.EndGetResponse(asynchronousResult);
    var reader = new StreamReader(webResponse.GetResponseStream());
    var documentName = reader.ReadToEnd();
    reader.Close();


    if (BytesUploaded < FileLength)
        UploadFileEx();
    else
    {
        DocumentName = documentName;
        Status = FileUploadStatus.Complete;
    }
}

---

谢谢，成功了！把我从又一天的头撞在桌子上的事中救了出来。谢谢，这奏效了！把我从又一天的头撞到桌子上救了出来。

private void ReadCallback(IAsyncResult asynchronousResult)
{
    var webRequest = (HttpWebRequest) asynchronousResult.AsyncState;
    var webResponse = (HttpWebResponse) webRequest.EndGetResponse(asynchronousResult);
    var reader = new StreamReader(webResponse.GetResponseStream());
    var documentName = reader.ReadToEnd();
    reader.Close();


    if (BytesUploaded < FileLength)
        UploadFileEx();
    else
    {
        DocumentName = documentName;
        Status = FileUploadStatus.Complete;
    }
}

Context.Response.Write(“Document Name”);