Using iTextSharp to correctly display Hebrew / Arabic text (Right to Left) in a PDF Document

Introduction

iTextSharp is a useful library for creating PDF documents in .Net. However because of the right to left nature of Hebrew and Arabic texts, adding them to the document normally through iTextSharp renders them unreadable.
Lets take a look at how we can solve this problem.

Download iTextSharp here

Please read the comments to guide you through the code.

Code

using iTextSharp.text;
using iTextSharp.text.pdf;
using System.Text.RegularExpressions;
using System.IO;
using System.Diagnostics;

public void WriteDocument()
{   //Declare a itextSharp document
    Document document = new Document(PageSize.A4);

    //Create our file stream and bind the writer to the document and the stream
    PdfWriter writer = PdfWriter.GetInstance(document, new FileStream(@"C:\Test.Pdf", FileMode.Create));

    //Open the document for writing
    document.Open();

   //Add a new page
    document.NewPage();

    //Reference a Unicode font to be sure that the symbols are present.
    BaseFont bfArialUniCode = BaseFont.CreateFont(@"C:\ARIALUNI.TTF", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
    //Create a font from the base font
    Font font = new Font(bfArialUniCode, 12);

    //Use a table so that we can set the text direction
    PdfPTable table = new PdfPTable(1);
    //Ensure that wrapping is on, otherwise Right to Left text will not display
    table.DefaultCell.NoWrap = false;

    //Create a regex expression to detect hebrew or arabic code points
    const string regex_match_arabic_hebrew = @"[\u0600-\u06FF,\u0590-\u05FF]+";
    if (Regex.IsMatch("מה קורה", regex_match_arabic_hebrew, RegexOptions.IgnoreCase))
    {
        table.RunDirection = PdfWriter.RUN_DIRECTION_RTL;
    }

    //Create a cell and add text to it
    PdfPCell text = new PdfPCell(new Phrase("מה קורה", font));
    //Ensure that wrapping is on, otherwise Right to Left text will not display
    text.NoWrap = false;

    //Add the cell to the table
    table.AddCell(text);

    //Add the table to the document
    document.Add(table);

    //Close the document
    document.Close();

    //Launch the document if you have a file association set for PDF's
    Process AcrobatReader = new Process();
    AcrobatReader.StartInfo.FileName = @"C:\Test.Pdf";
    AcrobatReader.Start();

}

Conclusion

We used a regex expression to detect if the text was Hebrew or Arabic and then set the .RunDirection of the PdfpTable or PdfPCell accordingly.
Ensure that .NoWrap is set to false on the default cell of the table and any cells that you may create manually, if wrapping is turned off the right to left text will not be displayed.