'宣言
Public Class _NumberDataFieldDefinition Inherits _DataFieldDefinition Implements IDataFieldDefinition, GrapeCity.DataVisualization.Chart.IEquatable(Of IDataFieldDefinition), INumberDataFieldDefinition
public class _NumberDataFieldDefinition : _DataFieldDefinition, IDataFieldDefinition, GrapeCity.DataVisualization.Chart.IEquatable<IDataFieldDefinition>, INumberDataFieldDefinition