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c#linq
wderoode
wderoode

Reputation: 63

How to convert List<String[]> to List<int[]>?

I am trying to cast a list of string arrays to a list of int arrays. I have tried the following:

List<int[]> dataset = Read(fileName, separator).Select(
    line => Array.ConvertAll(line, s => int.Parse(s)
);

Read return a list of string array: List<String[]> dataset

Upvotes: 2

Views: 3221

Answers (3)

Roger
Roger

Reputation: 86

List<string[]> source = new List<string[]>
{
    new string[2] { "2", "3" },
    new string[4] { "4", "5", "6", "7" },
    new string[1] { "1" }
};

List<int[]> result = source.Select(array => Array.ConvertAll(array, item => int.Parse(item))).ToList();

Upvotes: 0

AlbertoCh
AlbertoCh

Reputation: 120

You can try something like this:

List<int[]> Listintegers = yourList
    .Select(y => y.Select(x => int.Parse(x)).ToArray())
    .ToList();

Upvotes: 0

Yeldar Kurmangaliyev
Yeldar Kurmangaliyev

Reputation: 34244

You can use .ToList<T>() to convert .Select() result (which is IEnumerable<int[]>) to a list.
This way, you apply int.Parse to every item of item array, and convert the result to List.
Also, in order to provide code homogeneity, you can use LINQ Select and ToArray instead of Array.ConvertAll:

List<string[]> stringArrayList = ...;
List<int[]> intArrayList = stringArrayList
    .Select(stringArray => stringArray.Select(int.Parse).ToArray())
    .ToList();

One little correction: you do not cast string to an int, you convert / parse it.

Upvotes: 3

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