Render Tasks

Using a Render Task a developer can hook into the rendering process of the email and make changes to the message body/subject and the MailMessage-object itself. This can be used to add attachments, custom headers, or to replace/update content in the email.

Newsletter Studio uses Render Tasks to:

• Replace merge fields (ReplaceMergeFieldsRenderTask)
• Append tracking to links (AddClickTagsRenderTask)
• Insert tracking pixel in email (AddTrackingPixelRenderTask)
• Make relative links absolute (ReplaceRelativeLinksRenderTask)
• Replace Umbraco-links and relative images (ProcessUmbracoContentRenderTask)

Custom Render Task

Developers can create render tasks and register them during startup. Just implement IRenderTask, we will call the Process() method once for each recipient. Be aware that any heavy work inside a Render Task will slow down the rendering and send-out process.

public class AddAttachmentRenderTasks : IRenderTask
{
    public void Process(RenderTaskProcessingResult result, RenderTaskParameters parameters)
    {
        parameters.MailMessage.Attachments.Add(GetAttachmentFor(parameters.Recipient));
    }

    private Attachment GetAttachmentFor(IRecipientDataModel recipientDataModel)
    {
        using (var stream = File.OpenRead("c:\\temp\\invoice.pdf"))
        {
            return new Attachment(stream,"Invoice123.pdf");
        }
    }
}

We also need to register the Render Task during application startup

public class SiteComposer : IUserComposer
{
    public void Compose(Composition composition)
    {
        composition.NewsletterStudio().RenderTasks.Append<AddAttachmentRenderTasks>();
    }
}

Remove Core tasks

It's also possible to remove/replace the core Render Tasks. Here is an example of how to inactivate all the tracking:

public class MySiteComposer : IUserComposer
{
    public void Compose(Composition composition)
    {
        composition.NewsletterStudio().RenderTasks.Remove<AddTrackingPixelRenderTask>();
        composition.NewsletterStudio().RenderTasks.Remove<AddClickTagsRenderTask>();
    }
}

This will of course mean that any reports will not work.