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获取表示 SADataReader 是否已关闭的值。
Public ReadOnly Overrides Property IsClosed As Boolean
public override bool IsClosed {get;}
如果 SADataReader 已关闭,则返回 true,否则返回 false。
关闭 SADataReader 后,只能调用 IsClosed 和 RecordsAffected 属性。