循环删除集合

                int count = RepaymentCollection.Count;
                int i = 0;
                while(i<count )
                {
                    if (RepaymentCollection[i].CheckResult != "√")
                    {
                        InputRepayment r = new InputRepayment();
                        r = GetCheckedRepayment(RepaymentCollection[i]);
                        RepaymentCollection.RemoveAt(i);
                        RepaymentCollection.Insert(i, r);
                    }
                    i++;
                }