How do I get the values inserted in a multiline textbox and put it in a list?

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I have a textbox (multiline = true) with values separated by lines, for example:
1
2
3
4
I wanted these values to be placed, via a button, in a list or even a vector to be able to use them in a calculation

What I have tried:

C#

//cálcular o Nspt inicial e final
//textInt_FNspt_N1 it's a texbox

        List<int32> N1 = new List<int>();

        private void btn_FNspt_calnspt_Click(object sender, EventArgs e)
        {
            N1.Clear();

            foreach (Int32 item in textInt_FNspt_N1.Text)
	        {
                N1.Add(Convert.ToInt32(item));		 
	        }
            MessageBox.Show(N1.Count.ToString());
        }

but when I do this code I ask to show the list size to the messagebox, which generates a different value ...

Posted 9-Mar-20 11:47am

João Henrique Braga

Updated 9-Mar-20 20:42pm

MadMyche

v2

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phil.o · Accepted Answer · 2020-03-09T20:43:00

You have to enumerate the lines and parse the values:

C#

private void btn_FNspt_calnspt_Click(object sender, EventArgs e)
{
   N1.Clear();

   string[] lines = textInt_FNspt_N1.Text.Split
   (
      new string[] { Environment.NewLine },
      StringSplitOptions.RemoveEmptyEntries
   );

   foreach (string line in lines)
   {
      if (int.TryParse(line, out int value))
      {
         N1.Add(value);
      }
   }

   MessageBox.Show(N1.Count.ToString());
}

How do I get the values ​​inserted in a multiline textbox and put it in a list?