System.Net.WebException:底层连接已关闭:接收时发生意外错误 [英] System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a receive

问题描述

我正在尝试在 C# 中创建一个方法来从 url 返回网页 html 内容的字符串.我尝试了几种不同的方法，但出现错误 System.Net.WebException:底层连接已关闭:接收时发生意外错误.

I'm trying to create a method in C# to return a string of a web pages html content from the url. I have tried several different ways, but I am getting the error System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a receive.

以下在本地工作正常，但在远程服务器上运行时出现上述错误:

The following works fine locally, but gets the above error when running on a remote server:

  public static string WebPageRead(string url)
    {
        string result = String.Empty;

        WebResponse response = null;
        StreamReader reader = null;

        try
        {
            if (!String.IsNullOrEmpty(url))
            {
                HttpWebRequest request = HttpWebRequest.Create(url) as HttpWebRequest;
                request.Method = "GET";
                request.KeepAlive = false;
                request.ProtocolVersion = HttpVersion.Version10;

                response = request.GetResponse();
                reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
                result = reader.ReadToEnd();
            }
        }
        catch (Exception exc)
        {
            throw exc;
        }
        finally
        {
            if (reader != null)
            {
                reader.Close();
            }

            if (response != null)
            {
                response.Close();
            }
        }

        return result;
    }

推荐答案

感谢您的回复，问题是由于远程服务器上的 DNS 问题！为了确认，我最后使用了以下代码:

Thanks for the responses, the problem was due to a DNS issue on the remote server! Just to confirm, I went with the following code in the end:

    public static string WebPageRead(string url)
    {
        string content = String.Empty;

        if (!String.IsNullOrEmpty(url))
        {
            HttpWebRequest request = HttpWebRequest.Create(url) as HttpWebRequest;

            if (request != null)
            {
                request.Method = "GET";
                request.KeepAlive = false;
                request.ProtocolVersion = HttpVersion.Version10;

                try
                {
                    using (WebResponse response = request.GetResponse())
                    {
                        using (Stream stream = response.GetResponseStream())
                        {
                            using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
                            {
                                content = reader.ReadToEnd();
                            }
                        }
                    }
                }
                catch (Exception exc)
                {
                    throw exc;
                }
            }
        }                    

        return content;
    }

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