'宣言
Public Class TxtRenderingExtension Implements GrapeCity.ActiveReports.Extensibility.Rendering.IConfigurable, GrapeCity.ActiveReports.Extensibility.Rendering.IRenderingExtension
public class TxtRenderingExtension : GrapeCity.ActiveReports.Extensibility.Rendering.IConfigurable, GrapeCity.ActiveReports.Extensibility.Rendering.IRenderingExtension