Family Day update

Task/CSV-data-manipulation/C-sharp/csv-data-manipulation.cs

@@ -1,108 +1,21 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
 using System.IO;
+using System.Linq;
 
-namespace CSV
+namespace CSV_data_manipulation
 {
-    class CSV
+    class Program
     {
-        private Dictionary<Tuple<int, int>, string> _data;
-        private int _rows;
-        private int _cols;
-
-        public int Rows { get { return _rows; } }
-        public int Cols { get { return _cols; } }
-
-        public CSV()
+        static void Main()
         {
-            Clear();
-        }
-
-        public void Clear()
-        {
-            _rows = 0;
-            _cols = 0;
-            _data = new Dictionary<Tuple<int, int>, string>();
-        }
-
-        public void Open(StreamReader stream, char delim = ',')
-        {
-            string line;
-            int col = 0;
-            int row = 0;
-
-            Clear();
-
-            while ((line = stream.ReadLine()) != null)
+            var input = File.ReadAllLines("test_in.csv");
+            var output = input.Select((line, i) =>
             {
-                if (line.Length > 0)
-                {
-                    string[] values = line.Split(delim);
-                    col = 0;
-                    foreach (var value in values)
-                    {
-                        this[col,row] = value;
-                        col++;
-                    }
-                    row++;
-                }
-            }
-            stream.Close();
-        }
-
-        public void Save(StreamWriter stream, char delim = ',')
-        {
-            for (int row = 0; row < _rows; row++)
-            {
-                for (int col = 0; col < _cols; col++)
-                {
-                    stream.Write(this[col, row]);
-                    if (col < _cols - 1)
-                    {
-                        stream.Write(delim);
-                    }
-                }
-                stream.WriteLine();
-            }
-            stream.Flush();
-            stream.Close();
-        }
-
-        public string this[int col, int row]
-        {
-            get
-            {
-                try
-                {
-                    return _data[new Tuple<int, int>(col, row)];
-                }
-                catch
-                {
-                    return "";
-                }
-            }
-
-            set
-            {
-                _data[new Tuple<int, int>(col, row)] = value.ToString().Trim();
-                _rows = Math.Max(_rows, row + 1);
-                _cols = Math.Max(_cols, col + 1);
-            }
-        }
-
-        static void Main(string[] args)
-        {
-            CSV csv = new CSV();
-
-            csv.Open(new StreamReader(@"test_in.csv"));
-            csv[0, 0] = "Column0";
-            csv[1, 1] = "100";
-            csv[2, 2] = "200";
-            csv[3, 3] = "300";
-            csv[4, 4] = "400";
-            csv.Save(new StreamWriter(@"test_out.csv"));
+                if (i == 0)
+                    return line + ",SUM";
+                var sum = line.Split(',').Select(int.Parse).Sum();
+                return line + "," + sum;
+            }).ToArray();
+            File.WriteAllLines("test_out.csv", output);
         }
     }
 }