Extend TallPDF.NET

TallPDF.NET exposes its functionality through a set of cohesive .NET classes,You can extend all these classes by inheriting from them. These specialization can then be used both programmatically and from XML.

Inherit from a TallPDF.NET Class

The following class definition shows how you can create a special Heading called H1 that encapsulates all settings that are specific to level-1 headings.

using TallComponents.PDF.Layout.Paragraphs;

namespace MyCompany.TallPDF
{
  public class H1 : Heading
  {
    public H1() : base(0)
    {
      Label = "Chapter";
      Bookmark = "#l #0 #c";
      Fragments.Add(new Fragment("#l #0 #c",Font.HelveticaBold, 14));
    }

    public string Text
    {
      get { return Caption; }
      set { Caption = value; }
    }
  }
}

Code sample: Create a specialized Heading

The following client code shows how H1 would typically be used:

Document document = new Document();
Section section = document.Sections.Add();
H1 h1 = new H1();
h1.Text = "Extend TallPDF.NET";
section.Add(h1);

Code sample: Use the specialized Heading

Use Specialized Class in XML

Given the specialized class H1, you can now use it in XML as follows:

<document>
   <section>
      <paragraph type="MyCompany.TallPDF.H1">
         Hello Extended World
      </paragraph>
   </section>
</document>

Code sample: Use specialized class in XML

Note that the content of the text node is assigned to the Text property of H1. See also Section Text Properties in Chapter Generate PDF from XML.

NOTE: It is necessary to force the CLR to load the assembly that defines H1 before you do the conversion. Otherwise, the CLR will not be able to create a new instance of your custom type through the .NET reflection mechanisms. You can do this by referring a type inside this assembly or by loading the assembly explicitly by calling Assembly.LoadFrom("path to my assembly.dll" ).

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