C# 面向对象，字符串中取数组

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication2
{
class Program
{
static void Main(string[] args)
{
string s;
string result;
int sum;
s = Console.ReadLine();
sum = Myclass.getnumber(s, out result);
Console.WriteLine("一共有"+ sum +"个数字，"+"所有的数字是"+ result);
Console.ReadKey();
}
}

class Myclass
{
public static int getnumber(string strsource, out string result)
{
char []s= strsource.ToCharArray();
char[] s1 = new char[1];
result="";
int i = 0;
foreach (char item in s)
{
if (item >= 48 && item <= 57)
{
s1[0] = item;
result += s1[0].ToString();
i++;
}
}
return i;
}
}

}