public class UnicodeFontProvider : FontFactoryImp
    {
        static UnicodeFontProvider()
        {
            // روش صحیح تعریف فونت   
            var systemRoot = Environment.GetEnvironmentVariable("SystemRoot");
            FontFactory.Register(Path.Combine(systemRoot, "fonts\\tahoma.ttf"));
            // ثبت سایر فونت‌ها در اینجا
            //FontFactory.Register(Path.Combine(Environment.CurrentDirectory, "fonts\\irsans.ttf"));
        }

        public override Font GetFont(string fontname, string encoding, bool embedded, float size, int style, BaseColor color, bool cached)
        {
            if (string.IsNullOrWhiteSpace(fontname))
                return new Font(Font.FontFamily.UNDEFINED, size, style, color);
            return FontFactory.GetFont(fontname, BaseFont.IDENTITY_H, BaseFont.EMBEDDED, size, style, color);
        }
    }

    public class ImageProvider : AbstractImageProvider
    {
        public override string GetImageRootPath()
        {
            var path = Environment.GetFolderPath(Environment.SpecialFolder.MyPictures);
            return path + "\\"; // مهم است که این مسیر به بک اسلش ختم شود تا درست کار کند
        }
    }

    public static class XMLWorkerUtils
    {
        /// <summary>
        /// نحوه تعریف یک فایل سی اس اس خارجی
        /// </summary>
        public static ICssFile GetCssFile(string filePath)
        {
            using (var stream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
            {
                return XMLWorkerHelper.GetCSS(stream);
            }
        }
    }

    /// <summary>
    /// معادل پی دی افی المان‌های اچ تی ام ال را جمع آوری می‌کند
    /// </summary>
    public class ElementsCollector : IElementHandler
    {
        private readonly Paragraph _paragraph;

        public ElementsCollector()
        {
            _paragraph = new Paragraph
            {
                Alignment = Element.ALIGN_LEFT  // سبب می‌شود تا در حالت راست به چپ از سمت راست صفحه شروع شود
            };
        }

        /// <summary>
        /// این پاراگراف حاوی کلیه المان‌های متن است
        /// </summary>
        public Paragraph Paragraph
        {
            get { return _paragraph; }
        }

        /// <summary>
        /// بجای اینکه خود کتابخانه اصلی کار افزودن المان‌ها را به صفحات انجام دهد
        /// قصد داریم آن‌ها را ابتدا جمع آوری کرده و سپس به صورت راست به چپ به صفحات نهایی اضافه کنیم
        /// </summary>
        /// <param name="htmlElement"></param>
        public void Add(IWritable htmlElement)
        {
            var writableElement = htmlElement as WritableElement;
            if (writableElement == null)
                return;

            foreach (var element in writableElement.Elements())
            {
                fixNestedTablesRunDirection(element);
                _paragraph.Add(element);
            }
        }

        /// <summary>
        /// نیاز است سلول‌های جداول تو در توی پی دی اف نیز راست به چپ شوند
        /// </summary>        
        private void fixNestedTablesRunDirection(IElement element)
        {
            var table = element as PdfPTable;
            if (table == null)
                return;

            table.RunDirection = PdfWriter.RUN_DIRECTION_RTL;
            foreach (var row in table.Rows)
            {
                foreach (var cell in row.GetCells())
                {
                    cell.RunDirection = PdfWriter.RUN_DIRECTION_RTL;
                    foreach (var item in cell.CompositeElements)
                    {
                        fixNestedTablesRunDirection(item);
                    }
                }
            }
        }
    }

            using (var pdfDoc = new Document(PageSize.A4))
            {
                var pdfWriter = PdfWriter.GetInstance(pdfDoc, new FileStream("test.pdf", FileMode.Create));
                pdfWriter.RgbTransparencyBlending = true;
                pdfDoc.Open();


                var html = @"<span style='color:blue; font-family:tahoma;'><b>آزمایش</b></span>   
                                    کتابخانه <i>iTextSharp</i> <u>جهت بررسی فارسی نویسی</u>
                            <table style='color:blue; font-family:tahoma;' border='1'><tr><td>eeمتن</td></tr></table>
                            <code>This is a code!</code>
                            <br/>
                            <img src='av-13489.jpg' />
                            ";

                var cssResolver = new StyleAttrCSSResolver();
                // cssResolver.AddCss(XMLWorkerUtils.GetCssFile(@"c:\path\pdf.css"));
                cssResolver.AddCss(@"code 
                                     {
                                        padding: 2px 4px;
                                        color: #d14;
                                        white-space: nowrap;
                                        background-color: #f7f7f9;
                                        border: 1px solid #e1e1e8;
                                     }",
                                     "utf-8", true);

                // کار جمع آوری المان‌های ترجمه شده به المان‌های پی دی اف را انجام می‌دهد
                var elementsHandler = new ElementsCollector();

                var htmlContext = new HtmlPipelineContext(new CssAppliersImpl(new UnicodeFontProvider()));
                htmlContext.SetImageProvider(new ImageProvider());
                htmlContext.CharSet(Encoding.UTF8);
                htmlContext.SetAcceptUnknown(true).AutoBookmark(true).SetTagFactory(Tags.GetHtmlTagProcessorFactory());
                var pipeline = new CssResolverPipeline(cssResolver,
                                                       new HtmlPipeline(htmlContext, new ElementHandlerPipeline(elementsHandler, null)));
                var worker = new XMLWorker(pipeline, parseHtml: true);
                var parser = new XMLParser();
                parser.AddListener(worker);
                parser.Parse(new StringReader(html));

                // با هندلر سفارشی که تهیه کردیم تمام المان‌های اچ تی ام ال به المان‌های پی دی اف تبدیل شدند
                // الان تنها کافی کافی است تا این‌ها را در یک جدول راست به چپ محصور کنیم تا درست نمایش داده شوند
                var mainTable = new PdfPTable(1) { WidthPercentage = 100, RunDirection = PdfWriter.RUN_DIRECTION_RTL };
                var cell = new PdfPCell
                {
                    Border = 0,
                    RunDirection = PdfWriter.RUN_DIRECTION_RTL,
                    HorizontalAlignment = Element.ALIGN_LEFT
                };
                cell.AddElement(elementsHandler.Paragraph);
                mainTable.AddCell(cell);

                pdfDoc.Add(mainTable);
            }

            Process.Start("test.pdf");

import Pagination from "./common/pagination";

<Pagination
  itemsCount={this.state.movies.length}
  pageSize={this.state.pageSize}
  onPageChange={this.handlePageChange}
/>

  state = {
    movies: getMovies(),
    pageSize: 4
  };

  handlePageChange = page => {
    console.log("handlePageChange", page);
  };

import React, { Component } from "react";

class Pagination extends Component {
  render() {
    return (
      <nav>
        <ul className="pagination">
          <li className="page-item">
            <a className="page-link">1</a>
          </li>
        </ul>
      </nav>
    );
  }
}

export default Pagination;

class Pagination extends Component {
  // ...
  getPageNumbersArray() {
    const { itemsCount, pageSize } = this.props;
    const pagesCount = Math.ceil(itemsCount / pageSize);
    if (pagesCount === 1) {
      return null;
    }

    const pages = new Array();
    for (let i = 1; i <= pagesCount; i++) {
      pages.push(i);
    }
    return pages;
  }
}

class Pagination extends Component {
  render() {
    const pages = this.getPageNumbersArray();
    if (!pages) {
      return null;
    }

    return (
      <nav>
        <ul className="pagination">
          {pages.map(page => (
            <li key={page} className="page-item">
              <a className="page-link">{page}</a>
            </li>
          ))}
        </ul>
      </nav>
    );
  }

<a
   onClick={() => this.props.onPageChange(page)}
   className="page-link"
   style={{ cursor: "pointer" }}
>
   {page}
</a>

<Pagination
  itemsCount={this.state.movies.length}
  pageSize={this.state.pageSize}
  onPageChange={this.handlePageChange}
  currentPage={this.state.currentPage}
/>

class Movies extends Component {
  state = {
    movies: getMovies(),
    pageSize: 4,
    currentPage: 1
  };

  handlePageChange = page => {
    console.log("handlePageChange", page);
    this.setState({currentPage: page});
  };

<li
  key={page}
  className={
    page === this.props.currentPage
    ? "page-item active"
    : "page-item"
  }
>

  paginate() {
    const first = (this.state.currentPage - 1) * this.state.pageSize;
    const last = first + this.state.pageSize;
    return this.state.movies.slice(first, last);
  }

  render() {
    const { length: count } = this.state.movies;

    if (count === 0) return <p>There are no movies in the database.</p>;

    const movies = this.paginate();

> npm i -g typescript eslint tslint eslint-plugin-react-hooks jshint babel-eslint eslint-plugin-react eslint-plugin-mocha

> npm i prop-types --save

 C:/Users/{username}/AppData/Local/Microsoft/TypeScript/3.6/node_modules/@types/prop-types/index

 import PropTypes from "prop-types";

Pagination.propTypes = {
  itemsCount: PropTypes.number.isRequired,
  pageSize: PropTypes.number.isRequired,
  currentPage: PropTypes.number.isRequired,
  onPageChange: PropTypes.func.isRequired
};

export default Pagination;

public RegistryKey CreateSubKey( string subkey);

RegistryKey MyReg = Registry .CurrentUser.CreateSubKey( "SOFTWARE\\SomeCompany\\SomeApp\\SomeVer" );

public RegistryKey OpenSubKey( string name);
public RegistryKey OpenSubKey( string name, bool writable);

RegistryKey MyReg = Registry .CurrentUser.OpenSubKey( "SOFTWARE\\SomeCompany\\SomeApp\\SomeVer" , true );

public object GetValue( string name);
public object GetValue( string name, object defaultValue);

public void SetValue( string name, object value);

RegistryKey MyReg = Registry .CurrentUser.CreateSubKey( "SOFTWARE\\SomeCompany\\SomeApp\\SomeVer" );
int nSomeVal = ( int )MyReg.GetValue( "SomeVal" , 0);
MyReg.SetValue( "SomeValue" , nSomeVal + 1);
MyReg.Close();

public void DeleteSubKey( string subkey);
public void DeleteSubKey( string subkey, bool throwOnMissingSubKey);

public void DeleteSubKeyTree( string subkey);
public void DeleteSubKeyTree( string subkey, bool throwOnMissingSubKey);

public void DeleteValue( string name);
public void DeleteValue( string name, bool throwOnMissingValue);

public string [] GetSubKeyNames();

public string [] GetSubKeyNames();

public void Flush();

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:PreviewerTest"
             x:Class="PreviewerTest.MainPage">

<Label Text="Welcome to Xamarin Forms!" 
           VerticalOptions="Center" 
           HorizontalOptions="Center" />
</ContentPage>

//returns the file content as an array of bytes
public FileContentResult FileContentActionResult()
{
   var file = System.IO.File.ReadAllBytes(@"C:\path\dir1\HomeController.cs");
   return File(file, "text/plain", "HomeController.cs");
}

public IActionResult TestFileContentActionResult()
{
   var file = System.IO.File.ReadAllBytes(@"C:\path\dir1\HomeController.cs");
   return new FileContentResult(file, "text/plain") { FileDownloadName = "HomeController.cs" };
}

//return the file as a stream
public FileStreamResult FileStreamActionResult()
{
   //var file = System.IO.File.ReadAllBytes(@"C:\path\dir1\HomeController.cs");
   //var stream = new MemoryStream(file, writable:true);

   var fileStream = new FileStream(@"C:\path\dir1\HomeController.cs", FileMode.Open, FileAccess.Read);
   return File(fileStream, "text/plain", "HomeController.cs");
}

public IActionResult TestFileStreamActionResult()
{
   //var file = System.IO.File.ReadAllBytes(@"C:\path\dir1\HomeController.cs");
   //var stream = new MemoryStream(file, writable:true);
   var fileStream = new FileStream(@"C:\path\dir1\HomeController.cs", FileMode.Open, FileAccess.Read);
   return new FileStreamResult(fileStream, "text/plain") { FileDownloadName = "HomeController.cs" };
}

//returns a file specified with a virtual path
public VirtualFileResult VirtualFileActionResult()
{
   return File("/css/site.css", "text/plain", "site.css");
}

public IActionResult TestVirtualFileActionResult()
{
   return new VirtualFileResult("/css/site.css", "text/plain") { FileDownloadName = "site.css" };
}

//returns the specified file on disk, that is it's physical address
public PhysicalFileResult PhysicalFileActionResult()
{
   return PhysicalFile(@"C:\path\dir1\HomeController.cs", "text/plain", "HomeController.cs");
}

public IActionResult TestPhysicalFileActionResult()
{
   return new PhysicalFileResult(@"C:\path\dir1\HomeController.cs", "text/plain")
   {
      FileDownloadName = "HomeController.cs"
   };
}

 select SERVERPROPERTY('IsFullTextInstalled');

 instance features -> database engine services -> Full Text

 SQL Server encountered error 0x80070422 while communicating with full-text filter daemon host (FDHost) process.

 sp_fulltext_service 'restart_all_fdhosts'

 char, nchar, varchar, nvarchar, text, ntext, image, xml, varbinary(max)

 exec sys.sp_help_fulltext_system_components 'filter';

 exec sys.sp_fulltext_service 'load_os_resources', 1;
EXEC sp_fulltext_service 'update_languages';
EXEC sp_fulltext_service 'restart_all_fdhosts';

 select * from sys.fulltext_document_types;

 select lcid, name from sys.fulltext_languages order by name;

 select * from sys.fulltext_semantic_language_statistics_database;

 x64\Setup\SemanticLanguageDatabase.msi
x86\Setup\SemanticLanguageDatabase.msi

CREATE DATABASE semanticsdb
    ON ( FILENAME = 'D:\SQL_Data\SemanticLanguageDatabase\semanticsdb.mdf' )
    LOG ON ( FILENAME = 'D:\SQL_Data\SemanticLanguageDatabase\semanticsdb_log.ldf' )
    FOR ATTACH
GO

EXEC sp_fulltext_semantic_register_language_statistics_db @dbname = N'semanticsdb'
GO

<script src="_framework/blazor.webassembly.js" autostart="false"></script>

<body>
<div id="app">
    <div class="d-flex flex-column min-vh-100">
        <div class="d-flex vh-100">
<div class="d-flex w-100 justify-content-center align-self-center">
<div class="d-flex flex-column w-25">
<div>Loading <label id="progressbarLabel"></label></div>
<div class="progress mt-2" style="height: 2em;">
  <div id="progressbar" class="progress-bar progress-bar-striped"></div>  
</div>
</div>
</div>
        </div>
    </div>
</div>

(function () {
  let resourceIndex = 0;
  const fetchResponsePromises = [];
  const progressbar = document.getElementById("progressbar");
  const progressbarLabel = document.getElementById("progressbarLabel");
  const loadStart = new Date().getTime();

  if (!isAutostartDisabled()) {
    console.warn(
      "`blazor.webassembly.js` script tag doesn`t have the `autostart=false` attribute."
    );
    return;
  }

  Blazor.start({
    loadBootResource: function (type, filename, defaultUri, integrity) {
      if (type === "dotnetjs") {
        progressbarLabel.innerText = filename;
        return defaultUri;
      }

      const responsePromise = fetch(defaultUri, {
        cache: "no-cache",
        integrity: integrity,
      });
      fetchResponsePromises.push(responsePromise);
      responsePromise.then((response) => {
        if (!progressbar) {
          console.warn("Couldn't find the progressbar element on the page.");
          return;
        }

        if (!progressbarLabel) {
          console.warn(
            "Couldn't find the progressbarLabel element on the page."
          );
          return;
        }

        resourceIndex++;
        const totalResourceCount = fetchResponsePromises.length;
        const percentLoaded = Math.round(
          100 * (resourceIndex / totalResourceCount)
        );
        progressbar.style.width = `${percentLoaded}%`;
        progressbar.innerText = `${percentLoaded} % [${resourceIndex}/${totalResourceCount}]`;
        progressbarLabel.innerText = filename;
        if (percentLoaded >= 100) {
          var span = new Date().getTime() - loadStart;
          console.log(`All done in ${span} ms.`);
        }
      });

      return responsePromise;
    },
  });

  function isAutostartDisabled() {
    var wasmScript = document.querySelector(
      'script[src="_framework/blazor.webassembly.js"]'
    );
    if (!wasmScript) {
      return false;
    }

    var autostart = wasmScript.attributes["autostart"];
    return autostart && autostart.value === "false";
  }
})();

<script src="_framework/blazor.webassembly.js" autostart="false"></script>
<script src="js/blazorLoader.js"></script>
</body>