System.ArgumentException: '這個資料列已經屬於其他資料表。'

https://stackoverflow.com/questions/722052/this-row-already-belongs-to-another-table-error-when-trying-to-add-rows

 這個資料列已經屬於其他資料表。

This Row already belongs to another table error when trying to add rows?

DataTable dtNeedAdd = dtAfter.Clone();
....
DataRow drAdd = dtNeedAdd.NewRow();
drAdd = drNew;
dtNeedAdd.Rows.Add(drAdd);

需改成ImportRow

DataTable dtNeedAdd = dtAfter.Clone();
....
DataRow drAdd = dtNeedAdd.NewRow();
drAdd = drNew;
//dtNeedAdd.Rows.Add(drAdd);
dtNeedAdd.ImportRow(drAdd);