DinkToPdf

.NET Core P/Invoke wrapper for wkhtmltopdf library that uses Webkit engine to convert HTML pages to PDF.

Install

Library can be installed through Nuget here. Run command bellow from the package manager console:

PM> Install-Package RndUsr0.DinkToPdf -Version 1.0.9-20190207.1

The package now contains the native libraries for Windows, Linux and MacOS, so it shouldn't be necessary to copy them separately as previously required below.

Copy native library to root folder of your project. From there .NET Core loads native library when native method is called with P/Invoke. You can find latest version of native library here. Select appropriate library for your OS and platform (64 or 32 bit).

IMPORTANT

This has now been tested with IIS on Windows Server 2012 R2 and 2016. You will need to install the MS visual C++ 2015 redistributable package available here. The library has also been tested in console applications and with Kestrel web server both for Web Application and Web API .

Basic converter

Use this converter in single threaded applications.

Create converter:

var converter = new BasicConverter(new PdfTools());

Synchronized converter

Use this converter in multi threaded applications and web servers. Conversion tasks are saved to blocking collection and executed on a single thread.

var converter = new SynchronizedConverter(new PdfTools());

Define document to convert

var doc = new HtmlToPdfDocument()
{
    GlobalSettings = {
        ColorMode = ColorMode.Color,
        Orientation = Orientation.Landscape,
        PaperSize = PaperKind.A4Plus,
    },
    Objects = {
        new ObjectSettings() {
            PagesCount = true,
            HtmlContent = @"Lorem ipsum dolor sit amet, consectetur adipiscing elit. In consectetur mauris eget ultrices  iaculis. Ut                               odio viverra, molestie lectus nec, venenatis turpis.",
            WebSettings = { DefaultEncoding = "utf-8" },
            HeaderSettings = { FontSize = 9, Right = "Page [page] of [toPage]", Line = true, Spacing = 2.812 }
        }
    }
};

Convert

If Out property is empty string (defined in GlobalSettings) result is saved in byte array.

byte[] pdf = converter.Convert(doc);

If Out property is defined in document then file is saved to disk:

var doc = new HtmlToPdfDocument()
{
    GlobalSettings = {
        ColorMode = ColorMode.Color,
        Orientation = Orientation.Portrait,
        PaperSize = PaperKind.A4,
        Margins = new MarginSettings() { Top = 10 },
        Out = @"C:\DinkToPdf\src\DinkToPdf.TestThreadSafe\test.pdf",
    },
    Objects = {
        new ObjectSettings()
        {
            Page = "http://google.com/",
        },
    }
};

converter.Convert(doc);

Dependency injection

Converter must be registered as singleton.

public void ConfigureServices(IServiceCollection services)
{
    // Add converter to DI
    services.AddSingleton(typeof(IConverter), new SynchronizedConverter(new PdfTools()));
}