'宣言 Public Overloads Shared Sub AddLevel(Of T)( _ ByVal hierarhyDescriptor As HierarchyDescriptor(Of T), _ ByVal expr As Expression(Of Func(Of T,Object)), _ ByVal levelName As String, _ ByVal userDataExpr As Expression(Of Func(Of T,Object)) _ )
public static void AddLevel<T>( HierarchyDescriptor<T> hierarhyDescriptor, Expression<Func<T,object>> expr, string levelName, Expression<Func<T,object>> userDataExpr )