Fórum ➡ Convert from one format into another using LINQ ( as much as possible ) ♦, C#

Fórum ➡ Convert from one format into another using LINQ ( as much as possible ) ♦

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.51
  
// In reply to
// Convert row values into columns using LINQ in C#
// http://social.msdn.microsoft.com/Forums/WindowsServer/en-us/61385c74-0127-45cd-9ba5-509c65f9f8d7/convert-row-values-into-columns-using-linq-in-c?forum=csharpgeneral

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

// aljodav
// http://rextester.com/users/376

namespace Rextester
{
    using T5=Tuple<string,string,string,string,string>;
    using LT5=List<Tuple<string,string,string,string,string>>;
    public class Program
    {
        public static void Main(string[] args)
        {
            string[] lines={ // e.g., string[] lines= File.ReadAllLines(...);
"PID,QUARTER,FEATURE",
"1,Q1,FRANCE",
"1,Q1,GERMANY",
"1,Q2,ITALY",
"1,Q3,RUSSIA",
"2,Q2,INDIA",
"2,Q3,USA",
"3,Q2,CHINA",
"3,Q3,AUSTRALIA",
"3,Q3,NEW ZEALAND",
"3,Q4,JAPAN",
            };
           
            // ①
            LT5 target= new LT5();
            T5 header= Tuple.Create("Id","Q1","Q2","Q3","Q4");
            
            // ②
            lines.Skip(1).ToList().ForEach(s=>{
                
                // ②A
                string[] values= s.Split(',');
                string id= values[0].Trim();
                string quarter= values[1].Trim().ToUpper();
                string feature= values[2].Trim();
                
                // ②B
                if(false== new[]{"Q1","Q2","Q3","Q4"}.Any(x=>x== quarter))
                    throw new Exception("‼✖ Invalid quarter ✖‼");
                
                // ②C
                int i= target
                    .FindIndex(x=>id== x.Item1&&string.Empty==(
                    quarter=="Q1"?x.Item2:
                    quarter=="Q2"?x.Item3:
                    quarter=="Q3"?x.Item4:
                    x.Item5));
                
                // ②D
                T5 t= Tuple.Create(
                    id,
                    quarter=="Q1"?feature:i==-1?string.Empty:target[i].Item2,
                    quarter=="Q2"?feature:i==-1?string.Empty:target[i].Item3,
                    quarter=="Q3"?feature:i==-1?string.Empty:target[i].Item4,
                    quarter=="Q4"?feature:i==-1?string.Empty:target[i].Item5);
                
                // ②E
                if(i==-1)target.Add(t);else target[i]= t;
                    
            });
            
            // ③
            target.Sort(); // 1st sort, and then
            target.Insert(0,header); // insert the header
            target.ForEach(t=>Console.WriteLine(
                Regex.Replace(Regex.Replace(t.ToString(),@"\(|\)",""),",","\t\t")
            ));
                
            // ‼✖ salutation is not counted ✖‼
            Console.WriteLine("\n\nHello, world!");
        }
    }
}


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