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UiPath例外処理の落とし穴

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mainから子xamlを呼び出し手処理させている場合、mainと子のどちらにtrycatchを入れるとよいのか。

mainにて[invoke workflow file]をtrycatchで囲むと、
子にて例外が発生した場合、out引数に値が設定されない。
デフォルト値となる(データテーブルであればnull,Boolean型であればfalse)

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