'宣言 Public MustInherit Class GaugeBuilder (Of TControl As Gauge, TBuilder As GaugeBuilder(Of TControl,TBuilder)) Inherits ControlBuilder(Of TControl,TBuilder)
public abstract class GaugeBuilder<TControl,TBuilder> : ControlBuilder<TControl,TBuilder> where TControl: Gauge where TBuilder: GaugeBuilder<TControl,TBuilder>