我有两个列表,一个是原始列表,另一个是复制列表。我复制了原始列表,因为有一个原因:
我需要处理/操作原始列表中的数据,但是我不应该对其进行编辑。所以我创建了原始列表的副本来进行操作。但是一些我在复制列表上做的更改仍然会修改原始列表。
这是我的代码:
forPrintKitchenOrders = new List<OrderTemp>();
foreach (var itemss in forPrintKitchen)
{
forPrintKitchenOrders.Add(itemss); // HERE I AM ADDING ITEMS TO ANOTHER LIST BECAUSE I DON'T WANT TO EDIT ORIGINAL LIST (Change quantity etc)
}
if (forPrintKitchen.Count > 0)
{
foreach (var item in forPrintKitchenOrders.ToList())
{
foreach (var item2 in mainList)
{
if (item2.MainProductID == Convert.ToInt32(item._articleCode))
{
//I don't know why this is happening. I loop another list (copy of original list, because I didn't want to harm original list), and when I find certain item I am reducing quantity (-1),
//And later I realized and saw while I was debugging, that the value of quantity in my original "forPrintKitchen" list is also edited, I don't know how changed reflected there..
int calculate = Convert.ToInt32(item._quantity)-1; //this block is making me trouble, here I am reducing quantity and later that reflects to my forPrintKitchen list even if I am editing and looping //forPrintKitchenOrders(original's copy)
item._quantity = calculate.ToString();
}
}
}
foreach (var items in forPrintKitchen) //THIS IS MY ORIGILAN LIST AND SHE SHOULD NOT BE EDITED WHEN I EDIT "forPrintKitchenOrders" item
{
//Original List
OrdersKitchen kitchen = new OrdersKitchen();
kitchen.ProductID = Convert.ToInt32(items._articleCode);
kitchen.UserID = Util.User.UserID;
kitchen.UserName = Util.User.FirstName
kitchen.LastName = Util.User.LastName
kitchen.BillID = bill.BillID;
kitchen.Quantity = Convert.ToInt32(items._Quantity);
OrdersKitchen.Add(kitchen);
}
foreach (var itemss in mainList)
{
OrdersKitchen kitchen2 = new OrdersKitchen();
kitchen2.ProductID = Convert.ToInt32(itemss.MainProductID);
kitchen2.UserID = User.UserID;
kitchen2.UserName = Util.User.FirstName;
kitchen2.LastName = Util.User.LastName;
kitchen2.BillID = bill.BillID;
kitchen2.Quantity = Convert.ToInt32(0); //HARDCODE ZERO
OrdersKitchen.Add(kitchen2);
}
}
mainList.Clear();
//forPrintKitchenOrders.Clear();
}
在我看到回复后,我阅读了@sachin的帖子,并编写了类似于他们的代码。这样做可以吗?它看起来现在正在运行,但我不确定这个解决方案是否可行?
foreach (var itemss in forPrintKitchenOrders)
{
forPrintKitchenOrders.Add(new OrderTemp(itemss._articleCode,itemss._name,itemss._quantity,itemss._amount));
}
public class OrderTemp
{
public string _articleCode;
public string _name;
public string _quantity;
public double _amount;
public OrderTemp(string articleCode, string name, string quantity, double amount)
{
_articleCode = amount;
_name = name;
_quantity = quantity;
_amount = amount;
}
}
forPrintKitchenOrders.Add(itemss);
更改为forPrintKitchenOrders.Add(itemss.Clone());
。 - Rumpelstinsk