System.Data.UniqueConstraint.CheckConstraint C# (CSharp) Метод

        internal override void CheckConstraint(DataRow row, DataRowAction action)
        {
            if (Table.EnforceConstraints &&
                (action == DataRowAction.Add ||
                 action == DataRowAction.Change ||
                 (action == DataRowAction.Rollback && row._tempRecord != -1)))
            {
                if (row.HaveValuesChanged(ColumnsReference))
                {
                    if (ConstraintIndex.IsKeyRecordInIndex(row.GetDefaultRecord()))
                    {
                        object[] values = row.GetColumnValues(ColumnsReference);
                        throw ExceptionBuilder.ConstraintViolation(ColumnsReference, values);
                    }
                }
            }
        }