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