Custom Field

[Joël]

Is it possible to create personalized fields derived from CodeBasedField ?

And if so, how ? I tested but I am apparently blocked with the GetResultFragment() function.

[Boby]

Hi Laurent,
Custom page fields are not fully supported for now, as there are known issues with their serialization to XAML. If you decide  to use them, you can use the base CodeBasedField.CreateFragmentFromText method inside the GetResultFragment:

public class PagesNumberField : CodeBasedField
{
    public static readonly string FieldType = "NUMPAGES";

    static PagesNumberField()
    {
        CodeBasedFieldFactory.RegisterFieldType(PagesNumberField.FieldType, () => { return new PagesNumberField(); });
    }

    public override string FieldTypeName
    {
        get { return PagesNumberField.FieldType; }
    }

    protected override DocumentFragment GetResultFragment()
    {
        int pagesNumber = 0;
        if (this.Document != null)
        {
            pagesNumber = DocumentStructureCollection.GetChildrenCount(this.Document.DocumentLayoutBox);
        }

        string resultString = pagesNumber.ToString();

        return this.CreateFragmentFromText(resultString);
    }

    public override Field CreateInstance()
    {
        return new PagesNumberField();
    }
}

Note that this is just a sample implementation. It, for example, won't work in headers and footers.

All the best,
Boby
the Telerik team

[Joël]

It's perfect, thanks a lot.