![](/img/trans.png)
[英]c# removing item from listbox then it will deduct the value from the textbox
[英]How to remove and deduct total cost after removing an item from listbox?
我正在使用btnDelete_Click删除列表框中的项目,但总成本没有扣除。 请帮忙。 这是我的完整代码,我的问题开始于btnDelete_Click及以下。
public partial class POS:Form {int totalcost; int totalremove;
public POS()
{
InitializeComponent();
}
private void btnAdd_Click(object sender, EventArgs e)
{
String[] Juice;
Juice = new String[10];
Juice[0] = "Baby's Milk";
Juice[1] = "Pine Apple";
Juice[2] = "Vampire Venom";
Double[] Prices;
Prices = new Double[10];
Prices[0] = 200;
Prices[1] = 250;
Prices[2] = 300;
for (int i = 0; i < 4; i++)
{
lstBoxProducts.Items.Add(Juice[i] + "-" + Prices[i]);
}
}
private void btnAdd_Click_1(object sender, EventArgs e)
{
string text = lstBoxProducts.GetItemText(lstBoxProducts.SelectedItem);
lstProductChosen.Items.Add(text);
int x = 0;
if (lstBoxProducts.SelectedIndex == 0)
{
x = x + 1;
}
else if (lstBoxProducts.SelectedIndex == 1)
{
x = x + 2;
}
else if (lstBoxProducts.SelectedIndex == 2)
{
x = x + 3;
}
switch (x)
{
case 1:
totalcost = totalcost + 200;
break;
case 2:
totalcost = totalcost + 250;
break;
case 3:
totalcost = totalcost + 300;
break;
}
lbTotalCost.Text = ("Php" + totalcost.ToString());
}
private void POS_Load(object sender, EventArgs e)
{
}
private void btnDelete_Click(object sender, EventArgs e)
{
for (int i = lstProductChosen.SelectedIndices.Count - 1; i >= 0; i--)
{
lstProductChosen.Items.RemoveAt(lstProductChosen.SelectedIndices[i]);
}
int y = 0;
switch (y)
{
case 1:
totalremove = totalcost - 200;
break;
}
lbTotalCost.Text = ("Php" + totalcost.ToString());
}
}
}
你的问题在这里:
int y = 0;
switch (y)
{
case 1:
totalremove = totalcost - 200;
break;
}
你为什么只需要一个switch
来执行一个案例? 并且还可以理解, y
开关变量是用0
初始化的,并且在紧接的下一行开关是评估,只有单个情况是1
然后它是如何产生预期结果的?
您需要做的实际操作,更多的是删除操作,有必要获取将要删除的项的子总数,并从实际总数中减去该值。 这将是新的总数。 要获得项目总数,您可以通过处理项目文本来获取值,因此单击“删除”按钮中的代码为:
private void btnDelete_Click(object sender, EventArgs e)
{
int deleteCost = 0;
int itemCost = 0;
foreach(int selectedIndex in lstProductChosen.SelectedIndices)
{
itemCost = int.Parse(lstProductChosen.Items[selectedIndex].ToString().Split('-')[1]);
deleteCost += itemCost; lstProductChosen.Items.RemoveAt(selectedIndex);
}
totalcost = totalcost - deleteCost;
lbTotalCost.Text = ("Php" + totalcost.ToString());
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.