'宣言
Public Class _RegionEqualityComparer Inherits GrapeCity.DataVisualization.Chart._ObjectEqualityComparer(Of IRegion) Implements GrapeCity.DataVisualization.Chart.IEqualityComparer(Of IRegion)
public class _RegionEqualityComparer : GrapeCity.DataVisualization.Chart._ObjectEqualityComparer<IRegion>, GrapeCity.DataVisualization.Chart.IEqualityComparer<IRegion>