Question

我正在异步使用HttpWebRequest类，如下面的代码所示（它只是windows应用程序）：

    private void StartWebRequest(string url)
    {           
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.BeginGetResponse(new AsyncCallback(FinishWebRequest), request);          
    }

    private void FinishWebRequest(IAsyncResult result)
    {
            HttpWebResponse response = (result.AsyncState as HttpWebRequest).EndGetResponse(result) as HttpWebResponse;
            Stream responseStream = response.GetResponseStream();
            int num = 100000;
            byte[] buffer = new byte[num];
            int offset = 0;
            while ((num2 = responseStream.Read(buffer, offset, 1000)) != 0)
            {
                offset += num2;
            }
            MemoryStream stream = new MemoryStream(buffer, 0, offset);
            Bitmap bitmap = (Bitmap)Image.FromStream(stream);
            bitmap.Save(@"z:\new.jpg");
            response.Close();

            responseStream.Close();
            stream.Close();

    }

有时我会收到错误：

The underlying connection was closed : An unexpected error occured on a send

无论如何都要解决这个问题？

Answer 1

您必须将代码放在try和catch块中，如果发现错误，请尝试重新连接。您可以预定义试验次数的配额（例如，尝试最多3次），网络环境是不可预测的，因此您必须保持任何不可靠性。 BTW，在最后的试验之后不要忘记关闭流和连接

HttpWebResponse异步底层连接已关闭：发送时发生意外错误

1 个答案: