1.NAVER APIを使用してニュース情報を取得する

01.参考ブログ

-1.NAVER APIを使用して完全な構成とXMLコードを提供する

-2.JSONでニュースデータを受信して出力する

02.プロジェクト準備（コンソールプロジェクト）

-1.NAVERニュースAPI鍵を取得する

urlとapiの情報はすべてここで参考すればいいです!
https://developers.naver.com/docs/serviceapi/search/news/news.md#%EB%89%B4%EC%8A%A4

-2.NugetでNetonsoftを使用します。Jsonインストール

-3.(オプション)API Tester

API Testerを使用する理由は、コンソールを介して1つまたは複数のHTTPメッセージを送信することができますが、URLのみを表示したい場合は、API Testerが非常に効率的です.
https://chrome.google.com/webstore/detail/talend-api-tester-free-ed/aejoelaoggembcahagimdiliamlcdmfm?page=1&hl=ko&itemlang=pt

03.プロジェクト

-1. News.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;

namespace NewCloling
{
    class News
    {
        public string Title { get; set; }
        public string OriginalLink{get; set;}
        public string Link { get; set; }
        public string Description { get; set; }
        public DateTime Pubdate { get; set; }

        public News(string title, string originalLink, string link, string description, DateTime pubdate)
        {
            Title = title;
            OriginalLink = originalLink;
            Link = link;
            Description = description;
            Pubdate = pubdate;
        }

        public static News Make(XmlNode xn)
        {
            try
            {
                string title = Strip(xn.SelectSingleNode("title").InnerText);
                string olink = Strip(xn.SelectSingleNode("originallink").InnerText);
                string link = Strip(xn.SelectSingleNode("link").InnerText);
                string description = Strip(xn.SelectSingleNode("description").InnerText);
                DateTime pubdate = DateTime.Parse(xn.SelectSingleNode("pubDate").InnerText);
                return new News(title, olink, link, description, pubdate);
            }
            catch
            {
                return null;
            }
        }

        private static string Strip(string innerText)
        {
            int s = innerText.IndexOf("<");
            int e = innerText.IndexOf(">");
            while(s < e)
            {
                string b = innerText.Substring(0, s);
                string a = innerText.Substring(e + 1);
                innerText = b + a;
                s = innerText.IndexOf("<");
                e = innerText.IndexOf(">");
            }
            return innerText;
        }

        public override string ToString()
        {
            return Title;
        }
    }
}

-2. NaverNews.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Text;
using System.Xml;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

namespace NewCloling
{
    class NaverNews
    {
        public string SRC { get; set; }
        public string ID { get; set; }
        public string Secret { get; set; }

        public NaverNews(string iD, string secret)
        {
            this.ID = iD;
            this.Secret = secret;
        }

        public int Find(string src)
        {
            this.SRC = src;
            Stream stream;
            string url = $"https://openapi.naver.com/v1/search/news.xml?query={SRC}&sort=date";
            XmlDocument xdoc = MakeXMLDocument(url, out stream);
            XmlNode node = xdoc.SelectSingleNode("rss");
            XmlNode n = node.SelectSingleNode("channel");
            int total = int.Parse(n.SelectSingleNode("total").InnerText);
            stream.Close();
            return total;
        }

        private XmlDocument MakeXMLDocument(string url, out Stream stream)
        {
            WebRequest request = null;
            request = WebRequest.Create(url);
            request.Headers.Add("X-Naver-Client-Id", ID);
            request.Headers.Add("X-Naver-Client-Secret", Secret);

            WebResponse response = request.GetResponse();
            stream = response.GetResponseStream();
            XmlDocument xdoc = new XmlDocument();
            xdoc.Load(stream);
            return xdoc;
        }

        public List<News> FindNewsToXML(int start, int display)
        {
            Stream stream;
            string url = $"https://openapi.naver.com/v1/search/news.xml?query={SRC}&display={display}&start={start}&sort=date";

            XmlDocument xdoc = MakeXMLDocument(url, out stream);
            XmlNode node = xdoc.SelectSingleNode("rss");
            XmlNode n = node.SelectSingleNode("channel");
            XmlNodeList xnl = n.SelectNodes("item");
            List<News> nc = new List<News>();
            News news;
            foreach(XmlNode xn in xnl)
            {
                news = News.Make(xn);
                if(news == null)
                {
                    break;
                }
                nc.Add(news);
            }
            stream.Close();
            return nc;
        }

        private string MakeJSONDocument(string url)
        {
            string responseFromServer = string.Empty;

            try
            {
                WebRequest request = WebRequest.Create(url);

                request.Method = "GET";
                request.ContentType = "application/json";
                request.Headers["X-Naver-Client-Id"] = ID;
                request.Headers["X-Naver-Client-Secret"] = Secret;

                using (WebResponse response = request.GetResponse())
                using (Stream dataStream = response.GetResponseStream())
                using (StreamReader reader = new StreamReader(dataStream))
                    responseFromServer = reader.ReadToEnd();
            }
            catch
            {
                return null;
            }

            return responseFromServer;
        }

        public List<News> FindNewsJson(int start, int display)
        {
            string url = $"https://openapi.naver.com/v1/search/news.json?query={SRC}&display={display}&start={start}&sort=date";

            var parseJson = JObject.Parse(MakeJSONDocument(url));
            
            // var QueryResultCount = Convert.ToInt32(parseJson["display"]);
            // var TotalResultCount = Convert.ToInt32(parseJson["total"]);

            List<News> news =  JsonConvert.DeserializeObject<List<News>>(parseJson["items"].ToString());

            return news;
        }
    }
}

-3. Program.cs

using System;
using System.Collections.Generic;

namespace NewCloling
{
    class Program
    {
        static void Main(string[] args)
        {
            // naver api id & scret key
            string id = "";
            string secret = "";

            NaverNews nn = new NaverNews(id, secret);
            nn.SRC = "대구";
            List<News> news = nn.FindNewsJson(1, 20);

            foreach (News ns in news)
            {
                Console.WriteLine(ns.Title);
                Console.WriteLine("==");
                Console.WriteLine(ns.Description);
                Console.WriteLine("===========================");
            }

            /*
            int total = nn.Find("코로나");
            Console.WriteLine(total);
            List<News> nc = nn.FindNewsToXML(1, 20);
            foreach(News ns in nc)
            {
                Console.WriteLine(ns.Title);
                Console.WriteLine("==");
                Console.WriteLine(ns.Description);
                Console.WriteLine("===========================");
            }
            */
        }
    }
}

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