'宣言 Public MustInherit Class FlexPieBaseBuilder (Of T,TControl As FlexPieBase(Of T), TBuilder As FlexPieBaseBuilder(Of T,TControl,TBuilder)) Inherits FlexChartBaseBuilder(Of T,TControl,TBuilder)
public abstract class FlexPieBaseBuilder<T,TControl,TBuilder> : FlexChartBaseBuilder<T,TControl,TBuilder> where TControl: FlexPieBase<T> where TBuilder: FlexPieBaseBuilder<T,TControl,TBuilder>