CSV file into two dimensional array

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1.00/5 (1 vote)

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Newbie C# programmer here (3 months)

My CSV file looks like this:
0,1,2,3
4,5,6,7
8,9,10,11
12,13,14,15
16,17,18,19
20,21,22,23

How do I code this into a 2D array?

What I have tried:

StreamReader stream = null;
  string line;
  string[] fields;

  // open the file for reading; assumes file exists
  stream = new StreamReader(new FileStream(path, FileMode.Open, FileAccess.Read));
  while (!stream.EndOfStream) // while there is still data in the file
  {
      line = stream.ReadLine(); // read next line with product data
      part = line.Split(','); // split into fields using comma as delimiter

      for (int i = 0; i < part.GetLength(0); i++)
      {
          list[i, 0] = part[i];
          for (int j = 0; j < list.GetLength(1); j++)
          {
              list[0, i] = part[i];
          }

      }

      lst.Items.Add(list);

Posted 19-Apr-18 15:56pm

Member 13787083

Updated 8-May-22 12:53pm

v2

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2 solutions

Solution 5

//read the .csv file and store it in a list of string values
    var DataReader = new BufferedReader(new FileReader(csvPath.toString()));
    String line;
    var Arr = new ArrayList<String>();
    while ((line = DataReader.readLine()) != null) {
        Arr.add(line);
    }

    //break each item in the list to a matrix 
    var TwoDimdata = new String[Arr.size()][Arr.get(0).toString().split(",").length];
    for (var i = 0; i < TwoDimdata.length; i++) {
        for (var j = 0; j < TwoDimdata[0].length; j++) {
            var arr = Arr.get(i).split(",");
            TwoDimdata[i][j] = arr[j];
        }
    }

Posted 8-May-22 12:53pm

Member 15200630

Updated 8-May-22 12:55pm

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George Swan · Accepted Answer · 2018-04-19T19:50:00

I think that what you may need here is a jagged array. A jagged array is an array of arrays.

C#

string fileName = @"C:\temp\myfile.txt";
string[] lines = File.ReadAllLines(fileName);
 int[][] jaggedArray = new int[lines.Length][];
 for (int i = 0; i < lines.Length; i++)
 {
     string[] strArray = lines[i].Split(',');
     int[] intArray = Array.ConvertAll(strArray, int.Parse);
     jaggedArray[i] = intArray;
 }
 string result = string.Join(", ", jaggedArray[0]);
 Console.WriteLine(result);//0,1,2,3