need help in ArrayList

y s

i have a problem to separate last number from arrayList.
my exist arrayList are shown below:
1 2
1 3
1 2
2 3
1 2 3
1 3
2 3
1 2 3
may i know how to separate the last number, and store it into 2 araryList?
my expected output is
1st arraylist :
1
1
1
2
1 2
1
2
1 2

my second arrayList is:
2
3
2
3
3
3
3
3

hope someone can help me.

7 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes15y ago
Accepted answer
Is it possible that richTextBox11 contains a blank line?

If it does, I'd try instead:

foreach (string s in richTextBox11.Lines)
{
   int len = s.Length;
   if (len == 0) continue;
   al2.Add(s.Substring(0, len - 2));
   al3.Add(s.Substring(len - 1));
}
0
Sam Hobbs15y ago
Good, thank you. However please check the checkbox for Vuples's reply; it is the one that answered the question, correct?
0
Sam Hobbs15y ago
Yes if a reply solves the problem then you need to check the checkbox indicating that the reply helped. If you don't then people might stop helping you.
0
Suthish Nair15y ago
So why not accept the post as Answer. We need to tell this to everyone every time. Its must be a simple practice.
0
y s15y ago
Thanks very much , it is working now.
0
y s15y ago
i had try your code, but show me an error which is length cannot be less than zero.

        ArrayList al2 = new ArrayList();
            ArrayList al3 = new ArrayList();
            foreach (string s in richTextBox11.Lines)
            {
                int len = s.Length;
                al2.Add(s.Substring(0, len - 2));
                al3.Add(s.Substring(len - 1));
            }
richTextBox15.Clear();
            foreach (string s in al2)
            {
                richTextBox15.AppendText(s);

            }
richTextBox16.Clear();
            foreach (string s in al3)
            {richTextBox16.AppendText(s);

            }

M i make some mistake?
0
Vulpes15y ago
Try:

using System;
using System.Collections;

class Test
{
   static void Main()
   {
   ArrayList al1 = new ArrayList();
   al1.Add("1 2");
   al1.Add("1 3");
   al1.Add("1 2");
   al1.Add("2 3");
   al1.Add("1 2 3");
   al1.Add("1 3");
   al1.Add("2 3");
   al1.Add("1 2 3");

   ArrayList al2 = new ArrayList();
   ArrayList al3 = new ArrayList();

   foreach(string s in al1)
   {
   int len = s.Length;
   al2.Add(s.Substring(0, len - 2));
   al3.Add(s.Substring(len - 1));
   }

   Console.Clear();
   foreach(string s in al2) Console.WriteLine(s);
   Console.WriteLine();
   foreach(string s in al3) Console.WriteLine(s);
   Console.ReadKey();
   }
}
0