[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刪除列表框中的項目,但總成本沒有扣除。 請幫忙。 這是我的完整代碼,我的問題開始於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());
}
}
}
你的問題在這里:
int y = 0;
switch (y)
{
case 1:
totalremove = totalcost - 200;
break;
}
你為什么只需要一個switch
來執行一個案例? 並且還可以理解, y
開關變量是用0
初始化的,並且在緊接的下一行開關是評估,只有單個情況是1
然后它是如何產生預期結果的?
您需要做的實際操作,更多的是刪除操作,有必要獲取將要刪除的項的子總數,並從實際總數中減去該值。 這將是新的總數。 要獲得項目總數,您可以通過處理項目文本來獲取值,因此單擊“刪除”按鈕中的代碼為:
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());
}
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