C# 采集网页，浏览器可以打开，程序采集提示错误

Question

网址：https://pgi.kaipanla.com/w12/share/PContent2.html?AID=1548&tag=2&atype=ord
浏览器打开可以正常显示内容，使用WebRequest无法获得网页内容。
请给出demo

Answer 1

 using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Net;

namespace Q697477
{
    class Program
    {
        public static string PostData(string url, string param)
        {
            string strURL = url;
            System.Net.HttpWebRequest request;
            request = (System.Net.HttpWebRequest)WebRequest.Create(strURL);
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded; charset=UTF-8";
            string paraUrlCoded = param;
            byte[] payload;
            payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);
            request.ContentLength = payload.Length;
            Stream writer = request.GetRequestStream();
            writer.Write(payload, 0, payload.Length);
            writer.Close();
            System.Net.HttpWebResponse response;
            response = (System.Net.HttpWebResponse)request.GetResponse();
            System.IO.Stream s;
            s = response.GetResponseStream();
            string StrDate = "";
            string strValue = "";
            StreamReader Reader = new StreamReader(s, Encoding.UTF8);
            while ((StrDate = Reader.ReadLine()) != null)
            {
                strValue += StrDate + "\r\n";
            }
            return strValue;
        }
        static void Main(string[] args)
        {
            string s = PostData("https://article.kaipanla.com/w1/api/index.php?apiv=w12&PhoneOSNew=3", "c=ForumsMsgJX&a=GetInfo&MsgID=1548&Tag=1");
            Console.WriteLine(s);
        }
    }
}