Question

我有一个列表框，我的选定产品就像这样存储......

'产品名称'.padright（30）'价格''数量'

listBox1.Items.Add(details.Name.PadRight(30) + details.Price.ToString() + " " + 1 );

但是当我读取产品的价格时，它会选择价格和数量

string currentPriceString = foundItem.Replace(details.Name.PadRight(30), "");

string quantityString = foundItem.Replace(details.Name.PadRight(33), "");

我只想要currentPriceString中的价格和quantityString

中的数量

这是此方法的完整代码

private void ProductButton_Click(object sender, EventArgs e)
{

    Button ProductButton = sender as Button;
    DataAccess dataAccess = new DataAccess();
    int ProductID = Convert.ToInt32(ProductButton.Tag);

    Details details = dataAccess.ReadProductDetails(ProductID);

    decimal price = details.Price;

    string foundItem = CheckProductInListBox(details.Name);

    if (!String.IsNullOrEmpty(foundItem))
    {
        string currentPriceString = foundItem.Replace(details.Name.PadRight(30), "");
        decimal currentPriceValue;
        string quantityString = foundItem.Replace(details.Name.PadRight(33), "");
        int quantiy;
        MessageBox.Show(currentPriceString);

        if (Decimal.TryParse(currentPriceString, out currentPriceValue))
        {
            quantiy = Convert.ToInt16(quantityString);

            currentPriceValue += price;
            quantiy++;
            string newItem = details.Name.PadRight(30) + currentPriceValue.ToString()  + quantiy.ToString();

            int index = listBox1.Items.IndexOf(foundItem);
            listBox1.Items[index] = newItem;

        }
        else
        {
            MessageBox.Show("Error");
        }

    }
    else
    {
        listBox1.Items.Add(details.Name.PadRight(30) + details.Price.ToString() + " " + 1 );
    }
}

private string CheckProductInListBox(string name)
{
    foreach (string item in listBox1.Items)
    {
        if (item.Contains(name))
        {
            return item;
        }
    }
    return String.Empty;
}

Answer 1

在替换（foundItem.Replace(details.Name.PadRight(33), "");）时，您只是从字符串中删除名称部分，因此价格和数量肯定会存在。

你应该可以试试这段代码，

// suppose your found text is like this,
//foundItem = "AMIT".PadRight(30) + "200" + " " + "1";

您可以单独获得价格和数量，如下所示：

string currentPriceQuantityString = foundItem.Replace(details.Name.PadRight(30), "");
//currentPriceQuantityString => "200 1"

string[] strArray = currentPriceQuantityString.Split();

string currentPriceString = strArray[0]; //currentPriceString => "200"
string quantityString = strArray[1];     //quantityString => "1"

旁注：

我想你的话：

listBox1.Items.Add(details.Name.PadRight(30) + details.Price.ToString() + " " + 1 );

..应该是：

listBox1.Items.Add(details.Name.PadRight(30) + details.Price.ToString() + " " + "1" );

如何在列表框

1 个答案: