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

namespace ConsoleApplication7
{
    class Protocol
    {
        public void InputData() {
            string url;
            string protocol;
            Console.WriteLine("請輸入一個HTTP或者FTP地址：");
            url = Console.ReadLine();
            protocol = GetProtocol(url);
            Console.WriteLine("你輸入的地址使用的協議型別是：");
            Console.WriteLine(protocol);
            Console.ReadLine();
        }
        private string GetProtocol(string url) {
            int position;
            string protocol;
            position=url.IndexOf(":");
            if (position > 0)
            {
                protocol = url.Substring(0, position);
            }
            else {
                protocol = "沒找到";
            }
            return protocol;
        }
    }
}
 

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

namespace ConsoleApplication7
{
    class Program
    {
        static void Main(string[] args)
        {
            Protocol p = new Protocol();
            p.InputData();

        }
    }
}