是否有系统的方法（通过iText或其他方式）替换ReportViewer生成的PDF报告中的占位符项？

I have found that one of the Microsoft Reporting controls (the Chart) is inadequate for my needs. Since these controls aren't extensible, I've extended the functionality of a WPF control and am saving the control as a graphic. Unfortunately, ReportViewer's image control doesn't support vector graphics, either. Therefore my goal is to generate the PDF from ReportViewer with certain "placeholders" (e.g. a rectangle item), and then come behind with iTextSharp and add the vector graphic on top of these placeholders. Since the report length flows based on the input data, I can't know the coordinates of these placeholders before getting them. I have found that one of the Microsoft Reportin