Shortest method to convert an array to a string in c#/LINQ

Question

Closed as exact duplicate of this question.

I have an array/list of elements. I want to convert it to a string, separated by a custom delimitator. For example:

[1,2,3,4,5] => "1,2,3,4,5"

What's the shortest/esiest way to do this in c#?

I have always done this by cycling the list and checking if the current element is not the last one before adding the separator.

for(int i=0; i<arr.Length; ++i)
{
    str += arr[i].ToString();
    if(i<arr.Length)
        str += ",";
}

Is there a LINQ function that can help me write less code?

score 162 · Accepted Answer · answered Dec 19 '08 at 11:19

162

String.Join(",", arr.Select(p=>p.ToString()).ToArray())

answered Dec 19 '08 at 11:19

Mehrdad Afshari

7

You don't actually need the ToArray()... string.Join can take an IEnumerable, and IEnumerable.Select returns an IEnumerable. – neminem Sep 05 '12 at 21:33
11

@neminem `string.Join(string, IEnumerable)` did not exist in 2008. – Mehrdad Afshari Sep 07 '12 at 21:01

score 39 · Answer 2 · answered Dec 19 '08 at 11:19

39

String.Join(",", array.Select(o => o.ToString()).ToArray());

answered Dec 19 '08 at 11:19

David Schmitt

2 Answers2