Convert RTF to HTML and vice versa in C# and VB.Net

Convert RTF to HTML and vice versa
in C# and VB.Net.


Complete code

using System;
using System.IO;
using System.Collections.Generic;
using SautinSoft;

namespace Sample
{
    class Test
    {

        static void Main(string[] args)
        {
            LoopBetweenHtmlAndRtf(Path.GetFullPath(@"..\..\Start from HTML\start.html"), 10);
            LoopBetweenHtmlAndRtf(Path.GetFullPath(@"..\..\Start from RTF\start.rtf"), 10);            
        }
        /// <summary>
        /// Converts between HTML to RTF and vice versa multiple times.
        /// </summary>
        /// <param name="startingFile">A path to RTF or HTML file. Starting file.</param>
        /// <param name="loops">The number of conversion cycles.</param>
        public static void LoopBetweenHtmlAndRtf(string startingFile, int loops)
        {
            RtfToHtml r = new RtfToHtml();
            r.ImageStyle.IncludeImageInHtml = true;                        

            HtmlToRtf h = new HtmlToRtf();            
            
            List<string> extns = new List<string>() { ".html", ".rtf" };
            if (Path.GetExtension(startingFile).ToLower() == ".rtf")
                extns.Reverse();

            string input = File.ReadAllText(startingFile);
            string output = String.Empty;
            string workingDir = Path.GetDirectoryName(startingFile);
            string fileName = String.Empty;

            Console.WriteLine("***** Conversion Started *****");

            for (int i = 0; i < loops; i++)
            {
                try
                {
                    if (extns[0] == ".rtf")
                    {
                        r.OpenRtf(input);
                        output = r.ToHtml();
                        fileName = Path.Combine(workingDir, String.Format("{0}.html", i + 1));
                    }
                    else
                    {
                        h.OpenHtml(input);
                        output = h.ToRtf();
                        fileName = Path.Combine(workingDir, String.Format("{0}.rtf", i + 1));
                    }
                    Console.WriteLine(Path.GetFileName(fileName));
                    File.WriteAllText(fileName, output);
                    extns.Reverse();
                    input = output;
                }
                catch (Exception ex)
                {
                    Console.WriteLine($"Error: {ex.Message}");
                    Console.WriteLine("Press any key ...");
                    Console.ReadKey();
                }
            }
            Console.WriteLine("***** Conversion Finished *****");

            // Open the folder with results.
            string directory = Path.GetDirectoryName(startingFile);
            System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(directory)
            { UseShellExecute = true });
        }
    }
}

Download.

        
            Imports System
Imports System.IO
Imports System.Collections.Generic
Imports SautinSoft

Namespace Sample
    Friend Class Test

        Shared Sub Main(ByVal args() As String)
            LoopBetweenHtmlAndRtf(Path.GetFullPath("..\Start from HTML\start.html"), 10)
            LoopBetweenHtmlAndRtf(Path.GetFullPath("..\Start from RTF\start.rtf"), 10)
        End Sub
        ''' <summary>
        ''' Converts between HTML to RTF and vice versa multiple times.
        ''' </summary>
        ''' <param name="startingFile">A path to RTF or HTML file. Starting file.</param>
        ''' <param name="loops">The number of conversion cycles.</param>
        Public Shared Sub LoopBetweenHtmlAndRtf(ByVal startingFile As String, ByVal loops As Integer)

            Dim r As New RtfToHtml()
            r.ImageStyle.IncludeImageInHtml = True

            Dim h As New HtmlToRtf()

            Dim extns As New List(Of String)() From {".html", ".rtf"}
            If Path.GetExtension(startingFile).ToLower() = ".rtf" Then
                extns.Reverse()
            End If

            Dim input As String = File.ReadAllText(startingFile)
            Dim output As String = String.Empty
            Dim workingDir As String = Path.GetDirectoryName(startingFile)
            Dim fileName As String = String.Empty

            Console.WriteLine("***** Conversion Started *****")

            For i As Integer = 0 To loops - 1
                Try
                    If extns(0) = ".rtf" Then
                        r.OpenRtf(input)
                        output = r.ToHtml()
                        fileName = Path.Combine(workingDir, String.Format("{0}.html", i + 1))
                    Else
                        h.OpenHtml(input)
                        output = h.ToRtf()
                        fileName = Path.Combine(workingDir, String.Format("{0}.rtf", i + 1))
                    End If
                    Console.WriteLine(Path.GetFileName(fileName))
                    File.WriteAllText(fileName, output)
                    extns.Reverse()
                    input = output
                Catch ex As Exception
                    Console.WriteLine($"Error: {ex.Message}")
                    Console.WriteLine("Press any key ...")
                    Console.ReadKey()
                End Try
            Next i
            Console.WriteLine("***** Conversion Finished *****")

            ' Open the folder with results.
            Dim directory As String = Path.GetDirectoryName(startingFile)
            System.Diagnostics.Process.Start(New System.Diagnostics.ProcessStartInfo(directory) With {.UseShellExecute = True})
        End Sub
    End Class
End Namespace

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If you are looking also for a .Net solution to Create or Modify HTML documents, see our Document .Net.


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