Opposite of String.Split with separators (.net)

Question

Is there a way to do the opposite of String.Split in .Net? That is, to combine all the elements of an array with a given separator.

Taking ["a", "b", "c"] and giving "a b c" (with a separator of " ").

UPDATE: I found the answer myself. It is the String.Join method.

I have forgotten, searched for, and found this question / answer 3 times now in the last year. — sparks, Jan 28 '13 at 22:25
This can get confusing, since LINQ gives `string[]` a Join method that does something completely different. — yoozer8, May 03 '13 at 18:22

score 143 · Accepted Answer · edited Dec 11 '13 at 13:33

143

Found the answer. It's called String.Join.

edited Dec 11 '13 at 13:33

qwlice

556
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answered Jan 18 '09 at 16:46

robintw

27,571
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score 18 · Answer 2 · answered Jul 14 '17 at 18:13

You can use String.Join:

string[] array = new string[] { "a", "b", "c" };
string separator = " ";
string joined = String.Join(separator, array); // "a b c"

Though more verbose, you can also use a StringBuilder approach:

StringBuilder builder = new StringBuilder();

if (array.Length > 0)
{
    builder.Append(array[0]);
}
for (var i = 1; i < array.Length; ++i)
{
    builder.Append(separator);
    builder.Append(array[i]);
}

string joined = builder.ToString(); // "a b c"

score 0 · Answer 3 · answered Oct 08 '22 at 17:04

using string.join():

string[] array = new string[] { "a", "b", "c" };
string separator = ",";
string joined = String.Join(separator, array); // "a,b,c"

using StringBuilder

StringBuilder namesSB = new StringBuilder();
namesSB.AppendJoin(separator, array);
string joined =namesSB.ToString();

Opposite of String.Split with separators (.net)

3 Answers3

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