'宣言
Public Interface IDataModelTreeNode(Of T As {ITreeNode(Of T), IDataModel, IGrouping(Of DataValueType)}) Inherits IDataModel, GrapeCity.DataVisualization.Chart.IGrouping(Of DataValueType), ITreeNode(Of T)
public interface IDataModelTreeNode<T> : IDataModel, GrapeCity.DataVisualization.Chart.IGrouping<DataValueType>, ITreeNode<T> where T: ITreeNode<T>, IDataModel, IGrouping<DataValueType>