真不好意思问个基础问题，HashSet<T> 的 Contains()不出正确结果
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悬赏园豆：20
解决于 2013-09-13 15:37
HashSet<OrderDetailItem> list = new HashSet<OrderDetailItem>(); list.Add(new OrderDetailItem() { OrderNo = "23232322323", ProductCode = "338899", Barcode = "51023079339938838", Num = 1 }); list.Add(new OrderDetailItem() { OrderNo = "23232322323", ProductCode = "338899", Barcode = "51023079339938837", Num = 1 }); list.Add(new OrderDetailItem() { OrderNo = "23232322323", ProductCode = "338898", Barcode = "51023079339938836", Num = 1 }); list.Add(new OrderDetailItem() { OrderNo = "23232322323", ProductCode = "338899", Barcode = "51023079339938835", Num = 1 }); list.Add(new OrderDetailItem() { OrderNo = "23232322323", ProductCode = "338898", Barcode = "51023079339938834", Num = 1 }); list.Add(new OrderDetailItem() { OrderNo = "23232322323", ProductCode = "338899", Barcode = "51023079339938833", Num = 1 }); list.Add(new OrderDetailItem() { OrderNo = "23232322323", ProductCode = "338899", Barcode = "51023079339938832", Num = 1 }); list.Add(new OrderDetailItem() { OrderNo = "23232322323", ProductCode = "338899", Barcode = "51023079339938831", Num = 1 }); list.Add(new OrderDetailItem() { OrderNo = "23232322323", ProductCode = "338899", Barcode = "51023079339938830", Num = 1 }); var item = new OrderDetailItem() { OrderNo = "23232322323", ProductCode = "338899", Barcode = "51023079339938837", Num = 1 }; var mbEntity = list.Where(d => d.Barcode == item.Barcode).FirstOrDefault(); bool b = list.Contains(item); //为什么b老是false
