'宣言 Protected MustOverride Function GetLength() As System.Integer
'使用法 Dim instance As ParagraphObject Dim value As System.Integer value = instance.GetLength()
protected abstract System.int GetLength()
'宣言 Protected MustOverride Function GetLength() As System.Integer
'使用法 Dim instance As ParagraphObject Dim value As System.Integer value = instance.GetLength()
protected abstract System.int GetLength()