【第三十篇】C#合集

1.List<T>去重，并把里面的值加起来

            List<OrderPaymentPrintOutputDto> result = new List<OrderPaymentPrintOutputDto>();
            while (payList.Count > 0)
            {
                OrderPaymentPrintOutputDto m = payList[0];
                payList.RemoveAt(0);
                List<OrderPaymentPrintOutputDto> listB = new List<OrderPaymentPrintOutputDto>();
                foreach (OrderPaymentPrintOutputDto item in payList)
                {
                    if (item.PaymentName.Equals(m.PaymentName))
                    {
                        m.PayAmount += item.PayAmount;
                    }
                    else
                    {
                        listB.Add(item);
                    }
                }
                payList = listB;
                result.Add(m);
            }

 

2.List中相同的项，把值加起来去重

var payments = new Cust