Question

I am having difficulting locating a piece of code that will successfully read a file and store the information in a separate array.

Someone has suggested

var lines = File.ReadAllLines("peter_testresults.txt"); 

in a past question but “var” is not recognized.

CODE:

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;
    using System.IO;

    namespace WindowsFormsApplication4
    {
        public partial class Form1 : Form
        {
            public Form1()
            {
                InitializeComponent();
            }

            //return a pass/fail
            //return number of correct answers
            //return number of incorrect answers
            //return index figures of incorrect values

    correctAnswers ={B,D,A,A,C,A,B,A,C,D,B,C,D,A,D,C,C,B,D,A} 


    private string determinePassOrFail (); //return a pass/fail


        string[] lines= File.ReadAllLines("peter_testresults.txt");

        var c = correctAnswers.Where((x, i) => x.Equals(lines[i])).Count();





     private int numberCorrectAnswers(); //return number of correct answers
        {

        }


    private int numberIncorrectAnswers(); //return number of incorrect answers

    {

    }

    private string questionsIncorrectAnswers(); //return index figures of incorrect
  values

    {

    }





    }
            }

Answer 1

If you can’t use var (implicitly typed local variables) then that suggests you’re using a C# 2 compiler (e.g. VS2005), and therefore almost certainly .NET 2. (I’m assuming you’re not stuck with C# 1…)

Alternatively, you could be trying to use this as a field:

class Foo
{
    var lines = File.ReadAllLines("...");
}

That won’t work as fields can’t be implicitly typed – but I’d argue that doing that IO in a field initializer is a bad idea anyway…

This should still work though:

string[] lines = File.ReadAllLines("peter_testresults.txt");

as File.ReadAllLines was first introduced in .NET 2.

As an aside, I’d strongly advise you to try to upgrade to a more modern version of C#…