c#获取html内容

Question

我自己写的，用WebClient访问，为什么不能访问下面的链接呢？提示不能连接远程服务器
static void Main(string[] args)
{
            WebClient MyWebClient = new WebClient();
            Byte[] html = MyWebClient.DownloadData("https://detail.1688.com/offer/44007847996.html?spm=0.0.0.0.1P0sGD");    //获取html
            string  pageHtml = Encoding.Default.GetString(html);
          //此处插入正则匹配，获取价格……略……还没学会
           Console.WriteLine(pageHtml);    //显示下载的html
           Console.Read();
}
我目的是想从阿里巴巴某件商品网页自动获取商品价格，跪求前辈指点……

Answer 1

字符串前面加@,Byte[] html = MyWebClient.DownloadData(@"https://xxxxx");

Answer 2

还是不行，提示不能连接远程服务器
Byte[] pageData = MyWebClient.DownloadData(@"https://detail.1688.com/offer/44007847996.html?spm=0.0.0.0.1P0sGD");

Answer 3

        static void Main(string[] args)
        {            WebClient client = new WebClient();            Byte[]  sb= client.DownloadData("http://www.cnblogs.com");
            string res = Encoding.UTF8.GetString(sb);
            Console.WriteLine(res);
            Console.ReadLine();            Byte[] sb1 = client.DownloadData(@"https://detail.1688.com/offer/44007847996.html?spm=0.0.0.0.1P0sGD");    //获取html
            res = Encoding.UTF8.GetString(sb1);
            Console.WriteLine(res);
            Console.ReadLine();
        }前面是正常的，后面是不对，可能是因为https的原因？
提示：
未处理 System.Net.WebException
  HResult=-2146233079
  Message=无法连接到远程服务器
  Source=System
  StackTrace:
       在 System.Net.WebClient.DownloadDataInternal(Uri address, WebRequest& request)
       在 System.Net.WebClient.DownloadData(Uri address)
       在 System.Net.WebClient.DownloadData(String address)
       在 ConsoleApp1.ClassWebclient.Main(String[] args)
       在 System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       在 System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       在 Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       在 System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       在 System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       在 System.Threading.ThreadHelper.ThreadStart()
  InnerException: System.Net.Sockets.SocketException
       HResult=-2147467259
       Message=由于目标计算机积极拒绝，无法连接。 127.0.0.1:80
       Source=System
       ErrorCode=10061
       NativeErrorCode=10061
       StackTrace:
            在 System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
            在 System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)
       InnerException: 
另外，获取dom结点，建议使用htmlpaster或者xmlDocument工具和xpath进行导航，比正则要好。

Answer 4

WebClient 不支持 https。你可以使用 HttpWebRequest 方式访问，并且要注意为其对象的 ClientCertificates 集合加入你的证书，才能访问服务器。 

Answer 5

百度搜下 周金桥的帖子，C#中用HttpWebRequest中发送GET/HTTP/HTTPS请求
https://www.cnblogs.com/youfeng365/p/6138944.html