The cast to value type 'System.Decimal' failed because the materialized value is null. Eithe
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CurrentStock = db.BillEntry.Where(b => b.GoodsId == item.GoodsId).Sum(b => (decimal?)b.Qty) ?? 0,
出现这种错误是因为没有获取到数据造成的，可以使用三元判断来操作，注意Sum里的Qty应该可以为空，如果为空则返回0，否则正式返回。
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