將數據從一個集合復制到另一個C＃

Question

我想將數據從一個集合復制到另一個。 我正在使用以下代碼。

foreach (var x in invVM.invFreeItemsWithBatch)
            {
                invVM.invitemsWithBatch.Add(x);
            }

但這是錯誤的。 我該如何糾正？

public ObservableCollection<InvFreeItemWithBatch> invFreeItemsWithBatch = new ObservableCollection<InvFreeItemWithBatch>();
    public ObservableCollection<InvFreeItemWithBatch> AddInvFreeItemsByBatch(int intitemID, string stritem, double dblqty, double dblamount, string struOM, bool blnfreeIssue,
        double dbluPrice, double dbldiscPerce, double dbldiscAmount, string strbatch, double dblBalanceForFreeqty)
    {
        invFreeItemsWithBatch.Add(new InvFreeItemWithBatch(intitemID, stritem, dblqty, dblamount, struOM, blnfreeIssue, dbluPrice, dbldiscPerce,
            dbldiscAmount, strbatch, dblBalanceForFreeqty));
        stritem = ""; struOM = "";
        return invFreeItemsWithBatch;
    }

    public ObservableCollection<InvItemWithBatch> invitemsWithBatch = new ObservableCollection<InvItemWithBatch>();
    public ObservableCollection<InvItemWithBatch> AddInvItemsByBatch(int intitemID, string stritem, double dblqty, double dblamount, string struOM, bool blnfreeIssue,
        double dbluPrice, double dbldiscPerce, double dbldiscAmount, string strbatch, double dblBalanceForFreeqty)
    {
        invitemsWithBatch.Add(new InvItemWithBatch(intitemID, stritem, dblqty, dblamount, struOM, blnfreeIssue, dbluPrice, dbldiscPerce,
            dbldiscAmount, strbatch, dblBalanceForFreeqty));
        stritem = ""; struOM = "";
        return invitemsWithBatch;
    }

Answer 1

invFreeItemsWithBatch包含不同的類型invitemsWithBatch元件。

一個列表包含InvItemWithBatch元素的類型，另一個列表包含InvFreeItemWithBatch。

如果願意，可以在foreach創建新元素。

foreach (var x in invVM.invFreeItemsWithBatch)
{
    var newItem = new InvFreeItemWithBatch();
    // set the values of newItem to match the values of x
    // ...
    invVM.invitemsWithBatch.Add(newItem);
}

還考慮使InvItemWithBatch基類InvFreeItemWithBatch的：

class InvFreeItemWithBatch : InvItemWithBatch

這樣你可以輸入

foreach (var x in invVM.invFreeItemsWithBatch)
        {
            invVM.invitemsWithBatch.Add(x);
        }

但是您必須考慮到，兩個列表對x引用相同。