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

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?

Answer 1

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