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
var numbers = sNumbers?.Split(',')?.Select(Int32.Parse)?.ToList(); Recent versions of C# (v6+) allow you to do null checks in-line using the null-conditional operator
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(); 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) ); It is also possible to int array to direct assign value.
like this
int[] numbers = sNumbers.Split(',').Select(Int32.Parse).ToArray(); 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.ToInt32The result will be:
var intList = new List<int>(Array.ConvertAll(sNumbers.Split(','), Convert.ToInt32)); 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(','); 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(); } 
Why stick with just int when we have generics? What about an extension method like :
public static List<T> Split<T>(this string @this, char separator, out bool AllConverted) { List<T> returnVals = new List<T>(); AllConverted = true; var itens = @this.Split(separator); foreach (var item in itens) { try { returnVals.Add((T)Convert.ChangeType(item, typeof(T))); } catch { AllConverted = false; } } return returnVals; } and then
string testString = "1, 2, 3, XP, *, 6"; List<int> splited = testString.Split<int>(',', out _); You can use this:
List<Int32> sNumberslst = sNumbers.Split(',').ConvertIntoIntList(); 
