我最近为宝资通写软件，这个软件需要从网上下网页。但是使用 HttpRequest 的时候发现 StreamReader 等方法可能等待很久不会返回，能否有方法设置超时解决卡住线程

使用 HttpRequest 的时候，用 Stream 的方法读取需要服务器返回，如果服务器没有返回，那么这个同步方法将会卡住不会返回

可以通过 ReadWriteTimeout 设置超时时间

request.ReadWriteTimeout = 20000;

加上超时，就让应用不会在服务器没有返回等待太久。因为有些时候服务器或网络差，不能在比较短时间返回，我们设置这个不能太小。

               HttpWebRequest request = (HttpWebRequest) WebRequest.Create(url);

                request.Timeout = 20000;

                //网络响应

                request.ReadWriteTimeout = 20000;

                //request.Headers.Add(HttpRequestHeader.Accept, "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");

                //request.Headers["Accept"] = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";

                request.Method = "GET";

                request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";

                //request.CachePolicy=new HttpRequestCachePolicy()

                //{

                //};

                request.ContentType = "application/x-www-form-urlencoded";

                request.UserAgent =

                    "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36";

                request.AllowAutoRedirect = true;

                HttpWebResponse response = (HttpWebResponse) request.GetResponse();

                if (response.StatusCode == HttpStatusCode.OK)

                {

                    using (StreamReader stream = new StreamReader(response.GetResponseStream()))

                    {

                        return stream.ReadToEnd().Replace("\\u0027", "'");

                    }

                }