c＃从列表框中删除项目，然后它将从文本框中扣除值

Question

after i delete an item to the listbox it will also deduct the value from the textbox. here's my code.

private void listBox1_DoubleClick(object sender, EventArgs e)
    {
        int total1 = Convert.ToInt32(txtTotal.Text);


        if (listBox1.Text =="item1 600")
        {

            listBox1.Items.RemoveAt(listBox1.SelectedIndex);
            total1 -= 600;
        }
    }

Thanks in advance!

Answer 1

You should probably think about creating an object that holds the two pieces of information. With the object you could override the .ToString() method to only show Item1 and get the 600 from the non-viewed property.

Something like:

public class MyItem
{
   public string Text {get; set;}
   public string Amount {get; set;}

   public override string ToString()
   {
       return Text;
   }
} 

Then you can instantiate a new object and set the Name and Amount properties and then add it to your listbox.

When you are about to remove your item, you can get the Amount from the object and subtract it from your total. This would alleviate you having to create an If statement for every item in your list. Which

Answer 2

This should work it will remove 600 from the total TextBox:

    private void listBox1_DoubleClick(object sender, EventArgs e)
    {
        int total1 = int.Parse(txtTotal.Text);

        if (listBox1.SelectedValue.ToString() == "item1 600")
        {

            listBox1.Items.RemoveAt(listBox1.SelectedIndex);
            total1 -= 600;

            txtTotal.Text = total1 + "";
        }
    }