Convert array of integers to comma-separated string

It's a simple question; I am a newbie in C#, how can I perform the following

• I want to convert an array of integers to a comma-separated string.

I have

int[] arr = new int[5] {1,2,3,4,5};

I want to convert it to one string

string => "1,2,3,4,5"

Solution 1:

var result = string.Join(",", arr);

This uses the following overload of string.Join:

public static string Join<T>(string separator, IEnumerable<T> values);

Solution 2:

.NET 4

string.Join(",", arr)

.NET earlier

string.Join(",", Array.ConvertAll(arr, x => x.ToString()))

Solution 3:

int[] arr = new int[5] {1,2,3,4,5};

You can use Linq for it

String arrTostr = arr.Select(a => a.ToString()).Aggregate((i, j) => i + "," + j);