'宣言 Public MustOverride ReadOnly Property Document As C1Document
'使用法 Dim instance As C1DocumentSource Dim value As C1Document value = instance.Document
public abstract C1Document Document {get;}
'宣言 Public MustOverride ReadOnly Property Document As C1Document
'使用法 Dim instance As C1DocumentSource Dim value As C1Document value = instance.Document
public abstract C1Document Document {get;}