Hi Expert,
What is the best way to separate the individual characters in an array of strings strArr into an array of those characters charArr, as depicted below?
string[] strArr = { "123", "456", "789" };
char[] chrArr = { '1', '2', '3', '4', '5', '6', '7', '8', '9' };
This is what I am currently doing, but I do not think that it is very elegant:
int characterCount = 0;
for (int i = 0; i < strArr.Length; i++)
{
characterCount += strArr[i].Length;
}
int indexCount = 0;
char[] chrArr = new char[characterCount];
for (int i = 0; i < strArr.Length; i++)
{
for (int j = 0; j < strArr[i].Length; j++)
{
chrArr[indexCount] = strArr[i][j];
indexCount++;
}
}
Please help,
Thanks in advance.
static string[] strArr = { "123", "456", "789" };void Main()
{
const int iterations = 10000000; // 10 million
// Warm up JITter
StringJoin();
LINQSelectMany();
LINQ();
Stopwatch sw = Stopwatch.StartNew();
for (int index = 0; index < iterations; index++)
StringJoin();
sw.Stop();
sw.ElapsedMilliseconds.Dump("String.Join");
sw.Restart();
for (int index = 0; index < iterations; index++)
LINQSelectMany();
sw.Stop();
sw.ElapsedMilliseconds.Dump("LINQ SelectMany");
sw.Restart();
for (int index = 0; index < iterations; index++)
LINQ();
sw.Stop();
sw.ElapsedMilliseconds.Dump("LINQ");
}
public static void StringJoin()
{
char[] c = string.Join(string.Empty, strArr).ToCharArray();
}
public static void LINQSelectMany()
{
char[] c = strArr.SelectMany(s => s).ToArray();
}
public static void LINQ()
{
var characters = (from s in strArr
from c in s
select c).ToArray();
}