Question

好的，所以我的申请是一个简单的婴儿礼品登记处。在左侧groupBox中，我有2个输入文本框（item，store）和一个用于输出的listBox（lstWish）。这边是愿望清单。在右侧groupBox中，我有2个输入文本框（firstName，lastName）和一个listBox（lstPurchased）用于输出。按下button_click后，lstWish中的所选项目将移至lstPurchased。 lstWish目前输出类似于＆＃34;项目可在商店＆＃34;。

当项目从lstWish转到lstPurchased时，我想从firstName lastName＆＃34;添加＆＃34;。因此，lstPurchased将从firstName lastName＆＃34;读取＆＃34;商店中可用的商品。如何在移动字符串的同时添加字符串的后半部分？

以下是移动项目的方法：

private void MoveListBoxItems(ListBox lstWish, ListBox lstPurchased)
    {
        ListBox.SelectedObjectCollection sourceItems = lstWish.SelectedItems;
        foreach (var item in sourceItems)
        {
            lstPurchased.Items.Add(item);
        }
        while (lstWish.SelectedItems.Count > 0)
        {
            lstWish.Items.Remove(lstWish.SelectedItems[0]);
        }
    }

以下是按钮点击的代码：

private void btnBuy_Click(object sender, EventArgs e)
    {
        if (txtFirst.Text == "" || txtLast.Text == "")
        {
            MessageBox.Show("Please enter first and last name.", "Warning");
            this.DialogResult = DialogResult.None;
        }
        else
        {
            DialogResult result = MessageBox.Show("Click Yes to confirm purchase. Click No to cancel."
                , "Thank You", MessageBoxButtons.YesNo);
            if (lstWish.SelectedIndex >=0)
            {
                MoveListBoxItems(lstWish, lstPurchased);                   
            }
            else
            {
                return;
            }
        }
    }

列表是一个列表集合。有两个自定义类，礼物和来宾。这是具有填充listBox的toString的类Gift：

namespace GiftRegistry
{
class Gift
{
    #region Fields
    private string _item;
    private string _store;
    //private string _purchaser;
    #endregion

    #region Properties
    public string Item { get; set; }//modify the set clauses to include regex and title case and          .trim()

    public string Store { get; set; }

    //public string Purchaser { get; set; }
    #endregion

    #region Constructors
    public Gift()
    {
        this.Item = String.Empty;
        this.Store = String.Empty;
    }

    public Gift(string Item, string Store)
    {
        this.Item = Item;
        this.Store = Store;
    }
    #endregion

    #region Method
    public override string ToString()
    {
        return string.Format("{0} availble at {1}", this.Item, this.Store);
    }
    #endregion        
}

}

嘉宾班：

class Guest
{
    #region Fields
    private string _lastName;
    private string _firstName;
    #endregion

    #region Properties
    public string LastName
    {
        get { return _lastName; }
        set
        {                
            if (value == null)
                throw new ArgumentNullException("Name", "Please enter a name");
            _lastName = value.Trim();
        }
    }
    public string FirstName 
    {
        get { return _firstName; }
        set
        {//see above about regular expressions
            if (value == null)
                throw new ArgumentNullException("Name", "Please enter a name");
            _firstName = value.Trim();
        }
    }
    #endregion

    #region Constructors
    public Guest()
    {
        this.LastName = String.Empty;
        this.FirstName = String.Empty;
    }

    public Guest(string lastName)
    {
        this.LastName = lastName;
        this.FirstName = String.Empty;
    }

    public Guest(string lastName, string firstName)
    {
        this.LastName = lastName;
        this.FirstName = firstName;
    }
    #endregion

    #region Method
    public override string ToString()
    {
        return string.Format("{0} {1}", this.FirstName, this.LastName);
    }
    #endregion

}

Answer 1

在MoveListBoxItems()中，您可以将firstName和lastName连接到：

lstPurchased.Items.Add(string.Format("{0} from {1} {2}", item.ToString(), firstName, lastName));

将项目从一个列表框移动到另一个列表框时，如何添加到第二个列表框中的字符串？

1 个答案: