Find all numbers in a string in a listbox and add them up

I have a listbox in winforms and it will contain a bunch of text and I want to find all the decminal numbers and add them up. All the decimal numbers will be after a hyphen. I will create an example of the listbox below.

Listbox

Sandwich - 5.00 
no onions

bbq sauce - 1.00

Can - 1.00
coke

var sum = OrderListBox.Items
        .OfType<string>()
        .Select(s => Convert.ToDecimal(s.Split(new string[] { "-" }, StringSplitOptions.RemoveEmptyEntries)[1]))
        .Sum();

I have this code but it errors whenever the listbox has a blank line or a line of text without a hyphen followed by a number

>Solution :

You could use Regex ( using System.Text.RegularExpressions; ) with the following:

string firstPattern = "-\\s*[0-9.]+";
string detailPattern = "[0-9.]+";
Regex firstRegex = new Regex(firstPattern);
Regex detailRegex = new Regex(detailPattern);
double sum = 0;
foreach (string item in listBox1.Items)
{
     string match = firstRegex.Match(item).Value;
     if (match != String.Empty)
     {
          double toAdd = 0;
          string num = detailRegex.Match(match).Value;
          Double.TryParse(num, out toAdd);
          sum += toAdd;
     }
}

This finds the strings with the hyphen followed by a number and then within that string just finds the number part of it. Then parse it to a double and add it to your sum variable.