UiPathでデバッグ。この行は既に別のテーブルに属していますとは?
![](https://aftp.tokyo/wp-content/uploads/2021/05/2021-05-16-11_36_34-ActiproWindowChromeShadow.jpg)
UiPathで「この行は既に別のテーブルに属しています。」とエラーが表示されたことはありませんか?考えられるケースはいくつかあります。今回は考えられるケースのうち、代表的な例を挙げたいと思います。
代表的な例 「データ行を追加」でエラー発生
一番代表的な例は「データ行を追加」ではないでしょうか。データ行を追加とは、指定したデータテーブルの中に追加したいDataRow型配列を入力させるアクティビティなのですが、ここに指定したデータテーブルとは異なるDataRowを入れるとエラー「この行は既に別のテーブルに属しています。」が発生します。
例えば以下のような例。
![](https://aftp.tokyo/wp-content/uploads/2021/05/2021-05-16-11_53_05-ActiproWindowChromeShadow.jpg)
このケースとだと、多分InDtの先頭行だけを追加したいと思われます。列名も列数もOutDtと一緒なのに、なぜエラーになっちゃうのって思いますよね。実は新規追加したい行はデータテーブル「OutDt」とは異なっているんです。
![](https://aftp.tokyo/wp-content/uploads/2021/05/2021-05-16-12_02_30-ActiproWindowChromeShadow.jpg)
DataTableに属したDataRowを配列として出力する
DataRowって基本的にDataTable.DataRowと親にDataTableが存在しているんですね。
DataTable
├DataColumns
└DataRows
└row
なので、DataTable.Rows(0)のように指定した場合、DataRowは既に親が決まってるんです。親を切り替えることはできません。なのでその親離れをするためにDataTalbe.Rows(0).ItemArrayをすることで、このDataRowを親離れすることができます。
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