Opposite of String.Split with separators (.net)

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.

Solution 1:

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

Solution 2:

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"