两个list，循环一个，另一个Remove报错，念不明白 求解

两个list，循环一个，另一个Remove报错，想不明白 求解

C# code

        List<Model.ElectricityMeterInfo> operateModels = new List<DaHuaElectricMeter.Model.ElectricityMeterInfo>();        List<Model.ElectricityMeterInfo> operateTmpModels = new List<DaHuaElectricMeter.Model.ElectricityMeterInfo>(); foreach (Model.ElectricityMeterInfo emi in Command.SystemData.emiModels)                    {                        operateModels.Add(emi);                        operateTmpModels.Add(emi);                    } foreach (Model.ElectricityMeterInfo e in operateModels) {  operateTmpModels.Remove(e);}

C# code

                        List<int> list1 = new List<int>();            List<int> list2 = new List<int>();            for (int i = 0; i < 10; i++)            {                list1.Add(i);                list2.Add(i);            }            foreach (var item in list1)            {                list2.Remove(item);            }            List<object> list3 = new List<object>();            List<object> list4 = new List<object>();            for (int i = 0; i < 10; i++)            {                object temp = new object();                list3.Add(temp);                list4.Add(temp);            }            foreach (var item in list3)            {                list4.Remove(item);            }