public class PostToXml
    {
        
        public int PostId { get; set; }

        public string title { get; set; }

        public string link { get; set; }
        
        public string description { get; set; }

        public Nullable<DateTime> pubDate { get; set; }

      
    }

       public ContentResult RSS()
        {
            
            var items = GetRssFeed();
            var rss = new XDocument(new XDeclaration("1.0", "utf-8", "yes"),
              new XElement("rss",
                new XAttribute("version", "2.0"),
                  new XElement("channel",
                    new XElement("title", "آخرین مطالب سایت"),
                    new XElement("link", "http://" + Request.Url.Host+"/rss"),
                    new XElement("description", "آخرین مطالب سایت من"),
                    new XElement("copyright","(c)" + DateTime.Now.Year + ", نام سایت من.تمامی حقوق محفوظ است"),
                  from item in items
                  select
                  new XElement("item",
                    new XElement("title", item.title),
                    new XElement("description", item.description),
                    new XElement("link", item.link),
                    new XElement("pubDate", item.pubDate)

                  )
                )
              )
            );
            return Content(rss.ToString(), "text/xml");
        }



        public ContentResult Sitemap()
        {
            XNamespace ns = "http://www.sitemaps.org/schemas/sitemap/0.9";
            var items = GetLinks();
            var sitemap = new XDocument(new XDeclaration("1.0", "utf-8", "yes"),
                new XElement(ns + "urlset",
                    from item in items
                    select
                    new XElement("url",
                      new XElement("loc", item.link),
                      new XElement("changefreq", "monthly"),
                      new XElement("priority", "0.5")
                      )
                    )
                  );
            return Content(sitemap.ToString(), "text/xml");
        }


        public IEnumerable<PostToXml> GetRssFeed()
        {
          // یک کوئری که لیستی از تایپ مشخص شده به ما بدهد
        }

         public IEnumerable<PostToXml> GetLinks()
        {
            // یک کوئری که لیستی از تایپ مشخص شده به ما بدهد
        }

routes.MapRoute(
              "Sitemap", "sitemap",
              new { controller = "XML", action = "Sitemap" });
 routes.MapRoute(
              "RSS", "rss",
               new { controller = "XML", action = "RSS" });

http://domain.com/rss
http://domain.com/sitemap  

name: Build Application Code

on: [push]

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Check out code
        uses: actions/checkout@v2
      - name: Install Libraries
        uses: pip install -r requirements.txt -t .
    
    test:
      runs-on: ubuntu-latest
      needs: build
      steps:
      ...

name: Update Recent Blog Posts

on:
  schedule:
    - cron: "0 0 * * 0" # Run once a week at 00:00 (midnight) on Sunday
  workflow_dispatch:

jobs:
  update_posts:
    runs-on: ubuntu-latest

    steps:
    - name: Check out repository code
      uses: actions/checkout@v3

    - name: Run the script for fetching latest blog posts
      shell: pwsh
      run: |
        . ./.github/scripts/Get-Posts.ps1
        
    - name: Commit and Push the changes
      uses: mikeal/publish-to-github-action@master
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Xml.Linq;

namespace LinqToRSS
{
 public static class LanguageExtender
 {
     public static string SafeValue(this XElement input)
     {
         return (input == null) ? string.Empty : input.Value;
     }

     public static DateTime SafeDateValue(this XElement input)
     {
         return (input == null) ? DateTime.MinValue : DateTime.Parse(input.Value);
     }
 }

 public class RssEntry
 {
     public string Title { set; get; }
     public string Description { set; get; }
     public string Link { set; get; }
     public DateTime PublicationDate { set; get; }
     public string Author { set; get; }
     public string BlogName { set; get; }
     public string BlogAddress { set; get; }
 }

 public class Rss
 {
     static XElement selectDate(XElement date1, XElement date2)
     {
         return date1 ?? date2;
     }

     public static List<RssEntry> GetEntries(string feedUrl)
     {
         //applying namespace in an XElement
         XName xn = XName.Get("{http://purl.org/dc/elements/1.1/}creator");//{namespace}root
         XName xn2 = XName.Get("{http://purl.org/dc/elements/1.1/}date");

         var feed = XDocument.Load(feedUrl);
         if (feed.Root == null) return null;

         var items = feed.Root.Element("channel").Elements("item");
         var feedQuery =
             from item in items
             select new RssEntry
                        {
                            Title = item.Element("title").SafeValue(),
                            Description = item.Element("description").SafeValue(),
                            Link = item.Element("link").SafeValue(),
                            PublicationDate =
                                selectDate(item.Element(xn2), item.Element("pubDate")).SafeDateValue(),
                            Author = item.Element(xn).SafeValue(),
                            BlogName = item.Parent.Element("title").SafeValue(),
                            BlogAddress = item.Parent.Element("link").SafeValue()
                        };

         return feedQuery.ToList();
     }
 }

 class Program
 {
     static void Main(string[] args)
     {
         List<RssEntry> entries = Rss.GetEntries("http://weblogs.asp.net/aspnet-team/rss.aspx");
         if (entries != null)
             foreach (var item in entries)
                 Console.WriteLine(item.Title);

         Console.WriteLine("Press a key...");
         Console.ReadKey();
     }
 }
}

<?xml version="1.0" encoding="UTF-8" ?>
<?xml-stylesheet type="text/xsl" href="http://weblogs.asp.net/utility/FeedStylesheets/rss.xsl" media="screen"?>
<rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/" xmlns:wfw="http://wellformedweb.org/CommentAPI/">
<channel>
 <title>Latest Microsoft Blogs</title>
 <link>http://weblogs.asp.net/aspnet-team/default.aspx</link>
 <description />
 <dc:language>en</dc:language>
 <generator>CommunityServer 2007 SP1 (Build: 20510.895)</generator>
 <item>
   <title>Comments on my recent benchmarks.</title>
   <link>http://misfitgeek.com/blog/aspnet/comments-on-my-recent-benchmarks/</link>
   <pubDate>Mon, 10 Aug 2009 23:33:59 GMT</pubDate>
   <guid isPermaLink="false">c06e2b9d-981a-45b4-a55f-ab0d8bbfdc1c:7166225</guid>
   <dc:creator>Misfit Geek: msft</dc:creator>
   <slash:comments>0</slash:comments>
   <wfw:commentRss xmlns:wfw="http://wellformedweb.org/CommentAPI/">http://weblogs.asp.net/aspnet-team/rsscomments.aspx?PostID=7166225</wfw:commentRss>
   <comments>http://misfitgeek.com/blog/aspnet/comments-on-my-recent-benchmarks/#comments</comments>
   <description>Overall I’ve been pretty impressed ...</description>
   <category domain="http://weblogs.asp.net/aspnet-team/archive/tags/ASP.NET/default.aspx">ASP.NET</category>
 </item>
</channel>
</rss>

var items = feed.Root.Element("channel").Elements("item");

XName.Get("{mynamespace}root");
//or
XName.Get("root", "mynamespace");