'宣言
Public Class _RadialCartesianPlotDataLabelViewListLayoutPolicy(Of TPlotView As ICartesianPlotView) Inherits _PlotDataLabelViewListLayoutPolicy(Of TPlotView) Implements IPlotDataLabelViewListLayoutPolicy
public class _RadialCartesianPlotDataLabelViewListLayoutPolicy<TPlotView> : _PlotDataLabelViewListLayoutPolicy<TPlotView>, IPlotDataLabelViewListLayoutPolicy where TPlotView: ICartesianPlotView