Convert .RTF file to .PDF using PDFSharp library in ASP.Net using C# and VB.Net

Hi mashispano,

Refer below sample. Add the reference of Windows.Forms from add reference window in your project for reading the RTF file.

Namespaces

C#

using PdfSharp.Drawing;
using PdfSharp.Pdf;
using System.IO;

VB.Net

Imports PdfSharp.Drawing
Imports PdfSharp.Pdf
Imports System.IO

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    // Create a new PDF document.
    using (PdfDocument document = new PdfDocument())
    {
        // Adding an empty page.
        PdfPage page = document.AddPage();

        // Get an XGraphics object for drawing.
        using (XGraphics gfx = XGraphics.FromPdfPage(page))
        {
            // Creating font.
            XFont font = new XFont("Time New Roman", 15, XFontStyle.Regular);

            // Reading the RTF file using RichTextBox.
            System.Windows.Forms.RichTextBox richTextBox = new System.Windows.Forms.RichTextBox();
            richTextBox.Rtf = File.ReadAllText(Server.MapPath("~/templates/sample.rtf"));
            string text = richTextBox.Text;

            // Drawing the text.
            gfx.DrawString(text, font, XBrushes.Black, new XRect(0, 0, page.Width, page.Height), XStringFormats.Center);

            // Saving the document.
            string filename = Server.MapPath("~/export/" + "SAMPLE_" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".pdf");
            document.Save(filename);
        }
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    ' Create a new PDF document.
    Using document As PdfDocument = New PdfDocument()
        ' Adding an empty page.
        Dim page As PdfPage = document.AddPage()

        ' Get an XGraphics object for drawing.
        Using gfx As XGraphics = XGraphics.FromPdfPage(page)
            ' Creating font.
            Dim font As XFont = New XFont("Time New Roman", 15, XFontStyle.Regular)

            ' Reading the RTF file using RichTextBox.
            Dim richTextBox As Windows.Forms.RichTextBox = New Windows.Forms.RichTextBox()
            richTextBox.Rtf = File.ReadAllText(Server.MapPath("~/templates/sample.rtf"))
            Dim text As String = richTextBox.Text

            ' Drawing the text.
            gfx.DrawString(text, font, XBrushes.Black, New XRect(0, 0, page.Width, page.Height), XStringFormats.Center)

            ' Saving the document.
            Dim filename As String = Server.MapPath("~/export/" & "SAMPLE_" & DateTime.Now.ToString("yyyyMMddHHmmss") & ".pdf")
            document.Save(filename)
        End Using
    End Using
End Sub

Refer the following code. It will work for multiple line.

using (PdfDocument pdf = new PdfDocument())
{
    PdfPage pdfPage = pdf.AddPage();
    using (XGraphics graph = XGraphics.FromPdfPage(pdfPage))
    {
        var tf = new XTextFormatter(graph);
        var rect = new XRect(25, 25, pdfPage.Width - 50, pdfPage.Height);

        XPen xpen = new XPen(XColors.Navy, 0.4);

        graph.DrawRectangle(xpen, rect);
        XStringFormat format = new XStringFormat();
        format.LineAlignment = XLineAlignment.Near;
        format.Alignment = XStringAlignment.Near;

        XBrush brush = XBrushes.Purple;

        System.Windows.Forms.RichTextBox richTextBox = new System.Windows.Forms.RichTextBox();
        richTextBox.Rtf = File.ReadAllText(Server.MapPath("~/templates/sample.rtf"));
        string text = richTextBox.Text;
        tf.DrawString(text, new XFont("Time New Roman", 15, XFontStyle.Regular), brush, new XRect(rect.X + 5, rect.Y, rect.Width - 5, 34), format);

        string filename = Server.MapPath("~/export/" + "SAMPLE_" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".pdf");
        pdf.Save(filename);
    }
}