I need to create an array that indexes each line of text as a new index. C#/Xamarin/Android

Question

I have a text file with 7000+ lines in it(in list form). I need to create an array that changes each line into a new index so that I can add checkboxes next to each item. (Which will then print to a .txt file if checked.)

I have found a few articles about how to do this but none of them really answered my question. I honestly don't even know where to begin turning it into an array. Please let me know what information you need to assist me.

Answer 1

If you need to create a List object by reading a file and want to have each separate line as a list item, here is what you can do.

//File name
const string f = "TextFile1.txt";

// Declare new List.
List<string> lines = new List<string>();

// Use using StreamReader for disposing.
using (StreamReader r = new StreamReader(f))
{
    string line;
    while ((line = r.ReadLine()) != null)
    {
    lines.Add(line);
    }
}

And then if you wish to convert this list into an array, you can use the .ToArray() method of the List object.

    string[] arrayOfLines = lines.ToArray();

I hope i got your question correctly and this helps. Thanks.

Answer 2

string filename = @"C:\Example\existingfile.txt";
var lines = new List<string>();

using (StreamReader reader = File.OpenText(filename))
{
    while(!reader.EndOfStream) lines.Add(reader.ReadLine());
}

You can then iterate over the List like an array.

Answer 3

If your List is stored in a String you could try it the following way:

String largeList; 
String nl = System.getProperty("line.separator");

String[] lines = largeList.split(nl);

Lines contains now every line accessible by lines[x] -> x is the row number