采集反爬虫网站，采集不到内容！跪求大神指点迷津！

//以下是部分代码

 List<string> Weburllist = new List<string>();

                List<string> Weburllistzx = new List<string>();

                StringBuilder weburlSB = new StringBuilder();

                bool IsGenxin = false;

                MatchCollection mcexplain = Regex.Matches(sjurlDR["LinkContent"].ToString(), 



@"(?<=\$-\$).*?(?=\$_\$)", RegexOptions.Singleline);

                foreach (Match m in mcexplain)

                {

                    Weburllist.Add(m.Value);

                }               



                System.Net.WebRequest newswebrequest = System.Net.WebRequest.Create(sjurlDR



["LinkUrl"].ToString());



                Uri uri = new Uri(sjurlDR["LinkUrl"].ToString());

                SetHeaderValue(newswebrequest.Headers, "Host", uri.Host);

                SetHeaderValue(newswebrequest.Headers, "UserAgent", "Mozilla/5.0 (Windows NT 



6.1; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0");

                SetHeaderValue(newswebrequest.Headers, "Accept", "text/html,application/xhtml



+xml,application/xml;q=0.9,*/*;q=0.8");

                SetHeaderValue(newswebrequest.Headers, "Accept-Language", "zh-CN,zh;q=0.8,en-



US;q=0.5,en;q=0.3");

                SetHeaderValue(newswebrequest.Headers, "Accept-Encoding", "gzip, deflate, 



sdch");

                SetHeaderValue(newswebrequest.Headers, "Cookie:", 



"gscu_792856215=62888640q5c56420; _gscbrs_792856215=1");

                SetHeaderValue(newswebrequest.Headers, "Connection", "Keep-Alive");

                SetHeaderValue(newswebrequest.Headers, "Cache-Control", "max-age=0");



                //newswebrequest.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip, deflate, 



sdch");

                //newswebrequest.Headers.Add(HttpRequestHeader.AcceptLanguage, "zh-



CN,zh;q=0.8");

                //newswebrequest.Headers.Add(HttpRequestHeader.CacheControl, "max-age=0");

                //SetHeaderValue(newswebrequest.Headers, "Accept", "text/html,application/xhtml



+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");

                //SetHeaderValue(newswebrequest.Headers, "Connection", "Keep-Alive");

                //newswebrequest.Headers.Add(HttpRequestHeader.Cookie, 



"_gscu_792856215=62888640q5c56420; _gscbrs_792856215=1");

                //SetHeaderValue(newswebrequest.Headers, "Host", "zjks.com");

                //SetHeaderValue(newswebrequest.Headers, "UserAgent", "Mozilla/5.0 (Windows NT 



6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.94 Safari/537.36");





                System.Net.WebResponse newswebresponse = newswebrequest.GetResponse();

                System.IO.Stream newsstream = newswebresponse.GetResponseStream();

                System.IO.StreamReader sr = new StreamReader(newsstream, 



System.Text.Encoding.UTF8);

                string ProductionContent = string.Empty;

                ProductionContent = sr.ReadToEnd();

                sr.Close();



                Regex reg = new Regex(@"http(s)?://([\w-]+\.)+[\w-]+/?");

                string wangzhanyuming = reg.Match(sjurlDR["LinkUrl"].ToString(), 0).Value;

                MatchCollection mc = Regex.Matches(ProductionContent.Replace("href=\"/", "href=



\"" + wangzhanyuming).Replace("href='/", "href='" + wangzhanyuming).Replace("href=/", "href=" + 



wangzhanyuming).Replace("href=\"./", "href=\"" + wangzhanyuming), @"<[aA][^>]* href=[^>]*>", 



RegexOptions.Singleline);

                int Index = 1;

                foreach (Match m in mc)

                {

                    MatchCollection mc1 = Regex.Matches(m.Value.Replace("\"", "'"), @"[a-zA-



z]+://[^']*", RegexOptions.Singleline);

                    if (mc1.Count > 0)

                    {

                        foreach (Match m1 in mc1)

                        {

                            string linkurlstr = string.Empty;

                            linkurlstr = m1.Value.Replace("\"", "").Replace("'", "").Replace



(">", "").Replace(";", "");

                            weburlSB.Append("$-$");

                            weburlSB.Append(linkurlstr);

                            weburlSB.Append("$_$");

                            if (!Weburllist.Contains(linkurlstr) && !Weburllistzx.Contains



(linkurlstr))

                            {

                                IsGenxin = true;

                                Weburllistzx.Add(linkurlstr);

                                linkSb.AppendFormat("{0}<br/>", linkurlstr);

                            }

                        }

                    }

                    else

                    {

                        if (m.Value.IndexOf("javascript") == -1)

                        {

                            string amstr = string.Empty;

                            string wangzhanxiangduilujin = string.Empty;

                            wangzhanxiangduilujin = sjurlDR["LinkUrl"].ToString().Substring(0, 



sjurlDR["LinkUrl"].ToString().LastIndexOf("/") + 1);

                            amstr = m.Value.Replace("href=\"", "href=\"" + 



wangzhanxiangduilujin).Replace("href='", "href='" + wangzhanxiangduilujin);

                            MatchCollection mc11 = Regex.Matches(amstr, @"[a-zA-z]+://[^\s]*", 



RegexOptions.Singleline);



                            foreach (Match m1 in mc11)

                            {

                                string linkurlstr = string.Empty;

                                linkurlstr = m1.Value.Replace("\"", "").Replace("'", 



"").Replace(">", "").Replace(";", "");

                                weburlSB.Append("$-$");

                                weburlSB.Append(linkurlstr);

                                weburlSB.Append("$_$");

                                if (!Weburllist.Contains(linkurlstr) && !Weburllistzx.Contains



(linkurlstr))

                                {

                                    IsGenxin = true;

                                    Weburllistzx.Add(linkurlstr);

                                    linkSb.AppendFormat("{0}<br/>", linkurlstr);

                                }

                            }

                        }

                    }

                    Index++;

                }

                System.Threading.Thread.Sleep(1000);

                if (IsGenxin)

                {

                    originlinksInfo oinfo = new originlinksInfo();

                    oinfo = originlinksLogic.Get(int.Parse(sjurlDR["ID"].ToString()));

                    oinfo.LinkContentnext = oinfo.LinkContent;

                    oinfo.LinkContent = weburlSB.ToString();

                    originlinksLogic.Update(oinfo);

                    System.Threading.Thread.Sleep(2000);

                }

					

//如http://www.zjks.com/，这个网站总是采集失败，在这句代码

System.Net.WebResponse newswebresponse = newswebrequest.GetResponse();//这里在采集时总是跳出