How to convert a string array to an int array to access data inside int array?

Question

I have string similar to this

string text = "3;4;5;6;7;;3;4;5;6;7;;3;4;5;6;7;;3;4;5;6;7;;3;4;5;6;7;;";

I want to convert the above string into an int array like

[[3,4,5,6,7],[3,4,5,6,7], [3,4,5,6,7], [3,4,5,6,7], [3,4,5,6,7]]

I want to do this so that I can access each number because I want to do some maths like (3+4)/2 and (5+6)/2 for each set of array.

Until now I am using a simple split method:

string[] columns = text.Split(';');

and printing it by using:

foreach (var item in columns)
{
    Console.WriteLine($"{item}");            
}

But this has not worked and I am getting one number after another each indicating separate item. I want [3,4,5,6,7] as one item and 5 items inside this particular item and in integer form. Can you help me with how to do this?

SteveZ · Accepted Answer · 2020-01-23 11:59:06Z

2

Try it like this:

var columns = text.Split(new[] { ";;" }, StringSplitOptions.RemoveEmptyEntries);            
foreach (var column in columns)
{
     var numbers = column.Split(';').Select(y => int.Parse(y));
}

If you want empty entries, you have to Change the StringSplitOptions to StringSplitOptions.None

edited Jan 23, 2020 at 11:59

answered Jan 23, 2020 at 11:54

SteveZ

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2 Comments

Green Fire Over a year ago

important to note that you added the StringSplitOptions.RemoveEmptyEntries property (at the split function) .... maybe he wants to be able to create empty arrays for inputs like "1;2;;;;3;4" that should result in [[1,2],[],[3,4]]

Vedant Gonnade Over a year ago

No, I dont want to create empty array, infact I added two semicolons in the string(;;) to make it easier to divide the string in equal parts.

Johnathan Barclay · Accepted Answer · 2020-01-23 12:04:51Z

2

var output = text.Split(";;", StringSplitOptions.RemoveEmptyEntries)
    .Select(s => s.Split(";").Select(i => int.Parse(i)));

Split first on the ;;.

Then for each group, split again on ;.

Then parse each to int.

Update as per comment

I assume that empty entries need to be ignored, but if not, just remove the StringSplitOptions:

var output = text.Split(";;")
    .Select(s => s.Split(";").Select(i => int.Parse(i)));

Or if you need to be compatible with .NET Framework:

var output = text.Split(new [] { ";;" }, StringSplitOptions.RemoveEmptyEntries)
    .Select(s => s.Split(';').Select(i => int.Parse(i)));

Or to include empty entries:

var output = text.Split(new [] { ";;" }, StringSplitOptions.None)
    .Select(s => s.Split(';').Select(i => int.Parse(i)));

edited Jan 23, 2020 at 12:04

answered Jan 23, 2020 at 11:49

Johnathan Barclay

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9 Comments

SteveZ Over a year ago

This won't work, because there is no string.Split(string) Method. See here learn.microsoft.com/de-de/dotnet/api/…

Green Fire Over a year ago

Same as for @SteveZ answer, important to note that you added the StringSplitOptions.RemoveEmptyEntries property (at the split function) .... maybe he wants to be able to create empty arrays for inputs like "1;2;;;;3;4" that should result in [[1,2],[],[3,4]]

Johnathan Barclay Over a year ago

@SteveZ There is in .NET Core: learn.microsoft.com/en-us/dotnet/api/…

Vedant Gonnade Over a year ago

I am using foreach loop to display items of outputs but getting this instead: System.Linq.Enumerable+WhereSelectArrayIterator`2[System.String,System.Int32]

Johnathan Barclay Over a year ago

@VedantGonnade Your question stated that you wanted integers; if your simply writing to the console then int.Parse is an unnecessary step. Regardless, to write to the console you would do foreach (var item in output) { Console.WriteLine(string.Join(",", item)); }

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