CODEWITHSUNDEEP
c#.netfilestringstring-parsing
q0987
q0987

Reputation: 35982

C# - How to parse text file (space delimited numbers)?

Given a data file delimited by space,

10 10 10 10 222 331 
2 3 3 4 45
4 2 2 4

How to read this file and load into an Array

Thank you

Upvotes: 6

Views: 14161

Answers (4)

GregNash
GregNash

Reputation: 1336

I couldn't get Quick Joe Smith's answer to work, so I modified it. I put the modified code into a static method within a "FileReader" class:

public static double[][] readWhitespaceDelimitedDoubles(string[] input)
{
    double[][] array = input.Where(line => !String.IsNullOrWhiteSpace(line)) // Use this to filter blank lines.
        .Select(line => line.Split((string[])null, StringSplitOptions.RemoveEmptyEntries))
        .Select(line => line.Select(element => double.Parse(element)))
        .Select(line => line.ToArray())
        .ToArray();

        return array;
}

For my application, I was parsing for double as opposed to int. To call the code, try using something like this:

string[] fileContents = System.IO.File.ReadAllLines(openFileDialog1.FileName);
double[][] fileContentsArray = FileReader.readWhitespaceDelimitedDoubles(fileContents);

Console.WriteLine("Number of Rows:      {0,3}", fileContentsArray.Length);
Console.WriteLine("Number of Cols:      {0,3}", fileContentsArray[0].Length);

Upvotes: 0

Quick Joe Smith
Quick Joe Smith

Reputation: 8222

It depends on the kind of array you want. If you want to flatten everything into a single-dimensional array, go with Alex Aza's answer, otherwise, if you want a 2-dimensional array that maps to the lines and elements within the text file:

var array = File.ReadAllLines(filename)
                .Select(line => line.Split(" ".ToCharArray(), StringSplitOptions.RemoveEmptyEntries))
                .Where(line => !string.IsNullOrWhiteSpace(line)) // Use this to filter blank lines.
                .Select(int.Parse) // Assuming you want an int array.
                .ToArray();

Be aware that there is no error handling, so if parsing fails, the above code will throw an exception.

Upvotes: 6

Alex Aza
Alex Aza

Reputation: 78457

var fileContent = File.ReadAllText(fileName);
var array = fileContent.Split((string[])null, StringSplitOptions.RemoveEmptyEntries);

if you have numbers only and need a list of int as a result, you can do this:

var numbers = array.Select(arg => int.Parse(arg)).ToList();

Upvotes: 14

zsalzbank
zsalzbank

Reputation: 9857

You will be interested in StreamReader.ReadLine() and String.Split()

Upvotes: 1

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