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?

Mehrdad Afshari · Accepted Answer · 2008-12-19 11:19:12Z

163

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

answered Dec 19, 2008 at 11:19

Mehrdad Afshari

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2 Comments

You don't actually need the ToArray()... string.Join can take an IEnumerable, and IEnumerable.Select returns an IEnumerable.

@neminem string.Join(string, IEnumerable<string>) did not exist in 2008.

David Schmitt · Accepted Answer · 2008-12-19 11:19:41Z

39

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

answered Dec 19, 2008 at 11:19

David Schmitt

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