I am afraid the feature of exporting ListView data directly to PDF document is not supported. For the sake of correction, I have logged this requirement as PDFNET-20664 in our issue tracking system. We will further look into the details of this requirement and will keep you updated on the status of correction. For the time being, please try using DataTable and format the table programmatically. For more related information, please visit the following link for more information on Working with Tables
We apologize for your inconvenience.