Re-use List again

Question

Hi All,
I have count number after find 3 digits in Button_1 and then put to the list D4.
My question is how to use back D4 in Button_2.

My code test;

using System;  
using System.Collections.Generic;  
using System.ComponentModel;  
using System.Data;  
using System.Drawing;  
using System.Linq;  
using System.Text;  
using System.Threading.Tasks;  
using System.Windows.Forms;  
  
namespace Checking_13  
{  
    public partial class Form1 : Form  
    {  
        public static List<string> D1 = new List<string>();  
        public static List<string> D2 = new List<string>();  
  
        public static List<string> D3 = new List<string>();  
        public static List<string> D4 = new List<string>();  
        public static List<string> D5 = new List<string>();  
        public static List<int> D6 = new List<int>();  
  
  
         List<int> interested = new List<int>();  
  
        public Form1()  
        {  
            InitializeComponent();  
        }  
        private void Form1_Load(object sender, EventArgs e)  
        {  
  
            string centerIds_list = ("101, 221, 324, 471, 114, 233, 341, 443, 101, 324, 728");  
            List<string> result = centerIds_list?.ToString().Split(',').Select(s => s.Trim()).ToList();  
            foreach (var Val in result)  
            {  
                listBox1.Items.Add(Val);  
                D1.Add(Val);  
            }  
  
            string centerIds_list_ = ("742, 101, 728, 221, 384, 471, 114, 233, 349, 443, 101, 247");  
            List<string> result_ = centerIds_list_?.ToString().Split(',').Select(s => s.Trim()).ToList();  
  
            foreach (var Val_ in result_)  
            {  
                listBox2.Items.Add(Val_);  
                D2.Add(Val_);  
            }  
  
        }  
  
        private void button1_Click(object sender, EventArgs e)  
        {  
            var c = D2.Where(x => D1.Contains(x));  
            foreach (var voc in c)  
            {  
                D3.Add(voc);  
            }  
  
            var r =D3.Cast<string>().Select(i => i.Split(',').Select(n => string.Concat(n.Trim().OrderBy(f => f))))  
                .SelectMany(a => a)  
                .GroupBy(n => n)  
                .Select(g => new { n = g.Key, f = g.Count() });  
  
            string[] LCount = r.Select(z => $"{z.n} = {z.f}").ToArray();  
            listBox3.Items.AddRange(LCount);  
  
  
            D4.Add(LCount.ToString());  
  
        }  
  
        private void button2_Click(object sender, EventArgs e)  
        {  
  
            var SameNum = D4.Select(n => n.ToString()).Where(n => n.Distinct().Count() == 3).ToArray();  
  
            foreach (var Num_ in SameNum)  
            {  
                listBox4.Items.Add(Num_);  
            }  
  
        }  
  
        private void button3_Click(object sender, EventArgs e)  
        {  
  
        }  
  
        private void button4_Click(object sender, EventArgs e)  
        {  
  
        }  
  
        private void button5_Click(object sender, EventArgs e)  
        {  
  
        }  
    }  
}  
  
  

Answer 1

Hi @MiPakTeh , Welcome to Microsoft Q&A, you could try the following code to get what you wanted.

//D4.Add(LCount.ToString());  
foreach (var item in LCount)  
{  
    D4.Add(item);  
}  

And:

var SameNum = D4.Select(n => n).Where(n => n.Distinct().Count() == 5).ToArray();  

Best Regards,
Jiale

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