'宣言
Public Class _DataFieldGroupingDefinition (Of TKey,TGrouping As IGrouping(Of TKey)) Implements IDataFieldGroupingDefinition, GrapeCity.DataVisualization.Chart.IEquatable(Of IGroupingDefinition), IGroupingDefinition, IQueryInterface
public class _DataFieldGroupingDefinition<TKey,TGrouping> : IDataFieldGroupingDefinition, GrapeCity.DataVisualization.Chart.IEquatable<IGroupingDefinition>, IGroupingDefinition, IQueryInterface where TGrouping: IGrouping<TKey>