'宣言 Public Shared ReadOnly Property PageWidth As LengthRef
'使用法 Dim value As LengthRef value = LengthRef.Predefined.PageWidth
public static LengthRef PageWidth {get;}
            '宣言 Public Shared ReadOnly Property PageWidth As LengthRef
'使用法 Dim value As LengthRef value = LengthRef.Predefined.PageWidth
public static LengthRef PageWidth {get;}