I have a string that has numbers
string sNumbers = "1,2,3,4,5";
I can split it then convert it to List<int>
sNumbers.Split( new[] { ',' } ).ToList<int>();
How can I convert string array to integer list?
So that I'll be able to convert string[]
to IEnumerable
Better use int.TryParse
to avoid exceptions;
var numbers = sNumbers
.Split(',')
.Where(x => int.TryParse(x, out _))
.Select(int.Parse)
.ToList();
You can also do it this way without the need of Linq:
List<int> numbers = new List<int>( Array.ConvertAll(sNumbers.Split(','), int.Parse) );
// Uses Linq
var numbers = Array.ConvertAll(sNumbers.Split(','), int.Parse).ToList();
You can use new C# 6.0 Language Features:
(s) => { return Convert.ToInt32(s); }
with
corresponding method group Convert.ToInt32
new Converter<string, int>(Convert.ToInt32)
with: Convert.ToInt32
The result will be:
var intList = new List<int>(Array.ConvertAll(sNumbers.Split(','), Convert.ToInt32));
You can use this:
List<Int32> sNumberslst = sNumbers.Split(',').ConvertIntoIntList();
On Unity3d, int.Parse
doesn't work well. So I use like bellow.
List<int> intList = new List<int>( Array.ConvertAll(sNumbers.Split(','),
new Converter<string, int>((s)=>{return Convert.ToInt32(s);}) ) );
Hope this help for Unity3d Users.
My problem was similar but with the inconvenience that sometimes the string contains letters (sometimes empty).
string sNumbers = "1,2,hh,3,4,x,5";
Trying to follow Pcode Xonos Extension Method:
public static List<int> SplitToIntList(this string list, char separator = ',')
{
int result = 0;
return (from s in list.Split(',')
let isint = int.TryParse(s, out result)
let val = result
where isint
select val).ToList();
}
Joze's way also need LINQ, ToList()
is in System.Linq
namespace.
You can convert Array to List without Linq by passing the array to List constructor:
List<int> numbers = new List<int>( Array.ConvertAll(sNumbers.Split(','), int.Parse) );
also you can use this Extension method
public static List<int> SplitToIntList(this string list, char separator = ',')
{
return list.Split(separator).Select(Int32.Parse).ToList();
}
usage:
var numberListString = "1, 2, 3, 4";
List<int> numberList = numberListString.SplitToIntList(',');
It is also possible to int array to direct assign value.
like this
int[] numbers = sNumbers.Split(',').Select(Int32.Parse).ToArray();
Source: Stackoverflow.com