Sometimes you have a report which you want to print without showing a preview in ReportViewer. You can print an RDLC report programmatically using LocalReport object and CreateStreamCallback callback function.

There is an article in MSDN which describes how to print an RDLC report programmatically. Based on the idea of that article, I created an extension method for LocalReport class, called Print to make it easier to print the report without showing the report or any dialog:

It has two overloads:

• Print(): It uses the default page settings of the report.
• Print(PageSettings): It uses the page settings object which is passed to the method.

As an example, you can easily use it this way:

this.reportViewer1.LocalReport.Print();

LocalReport Print Extension Method

Here is the extension method:

using Microsoft.Reporting.WinForms;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Printing;
using System.IO;

public static class LocalReportExtensions
{
    public static void Print(this LocalReport report)
    {
        var pageSettings = new PageSettings();
        pageSettings.PaperSize = report.GetDefaultPageSettings().PaperSize;
        pageSettings.Landscape = report.GetDefaultPageSettings().IsLandscape;
        pageSettings.Margins = report.GetDefaultPageSettings().Margins;
        Print(report, pageSettings);
    }

    public static void Print(this LocalReport report, PageSettings pageSettings)
    {
        string deviceInfo =
            $@"<DeviceInfo>
                <OutputFormat>EMF</OutputFormat>
                <PageWidth>{pageSettings.PaperSize.Width * 100}in</PageWidth>
                <PageHeight>{pageSettings.PaperSize.Height * 100}in</PageHeight>
                <MarginTop>{pageSettings.Margins.Top * 100}in</MarginTop>
                <MarginLeft>{pageSettings.Margins.Left * 100}in</MarginLeft>
                <MarginRight>{pageSettings.Margins.Right * 100}in</MarginRight>
                <MarginBottom>{pageSettings.Margins.Bottom * 100}in</MarginBottom>
            </DeviceInfo>";

        Warning[] warnings;
        var streams = new List<Stream>();
        var currentPageIndex = 0;

        report.Render("Image", deviceInfo, 
            (name, fileNameExtension, encoding, mimeType, willSeek) => 
            {
                var stream = new MemoryStream();
                streams.Add(stream);
                return stream;
            }, out warnings);

        foreach (Stream stream in streams)
            stream.Position = 0;

        if (streams == null || streams.Count == 0)
            throw new Exception("Error: no stream to print.");

        var printDocument = new PrintDocument();
        printDocument.DefaultPageSettings = pageSettings;
        if (!printDocument.PrinterSettings.IsValid)
            throw new Exception("Error: cannot find the default printer.");
        else
        {
            printDocument.PrintPage += (sender, e) =>
            {
                Metafile pageImage = new Metafile(streams[currentPageIndex]);
                Rectangle adjustedRect = new Rectangle(
                    e.PageBounds.Left - (int)e.PageSettings.HardMarginX,
                    e.PageBounds.Top - (int)e.PageSettings.HardMarginY,
                    e.PageBounds.Width,
                    e.PageBounds.Height);
                e.Graphics.FillRectangle(Brushes.White, adjustedRect);
                e.Graphics.DrawImage(pageImage, adjustedRect);
                currentPageIndex++;
                e.HasMorePages = (currentPageIndex < streams.Count);
                e.Graphics.DrawRectangle(Pens.Red, adjustedRect);
            };
            printDocument.EndPrint += (Sender, e) =>
            {
                if (streams != null)
                {
                    foreach (Stream stream in streams)
                        stream.Close();
                    streams = null;
                }
            };
            printDocument.Print();
        }
    }
}