C#中使用语句和循环来控制程序流总程序....

using System;
using System.Collections.Generic;
using System.Text;namespace WebSites1
{
    class Program
    {　　        //Program entry
        static int Main(string[] args)
        {
            string[] siteName = new string[6];
            string phrase = "What is your pleasure";
            string choice;
            int count = 0;            //If there was a cmd line arg,use it;
            if (args.Length == 0)
            { 
                Console.WriteLine("{0},Master?",phrase);
            }
            else
            {
                Console.WriteLine("{0},{1}?",phrase,args[0]);
            }            do
            {
                //Print menu.
                Console.WriteLine("");
                Console.WriteLine("A - Add Site");
                Console.WriteLine("S - Sort List");
                Console.WriteLine("R - Show Report /n");
                Console.WriteLine("Q - Quit/n");
                Console.WriteLine("Please Choose(A/S/R/Q): ");                choice = Console.ReadLine();
                //Figure out what user wanted.
                switch(choice)
                {
                    //Add a site
                    case "a":
                    case "A":
                        Console.WriteLine("/nAdding Site/n");
                        string doAgain = "Y";                        //Keep it up as long as user wants
                        while(doAgain.ToUpper() == "Y")
                        {
                            Console.Write(
                                "Please Enter Site Name: ");
                              siteName[count++]=Console.ReadLine();                            Console.Write("Add Another?:");
                            doAgain=Console.ReadLine();                            //There can only by 5 items
                            if(count>=5)
                            {
                                
                                break;                            }
             
                        }
                        break;
                        //Sort the site list
                    case "s":
                    case "S":
                        Console.WriteLine("Sorting List....");                        int n = siteName.Length - 2;
                        int j,k;
                        string save;                        //Insertion sort,start at end & move up
                        for (k = n - 1; k >= 0; k--)
                        {
                            j = k + 1;
                            save = siteName[k];
                            //Sentinel makes inner
                            //loop more efficient
                            siteName[n + 1] = save;                            //Insert siteName[k] into its sorted position
                            while (string.Compare(save, siteName[j]) > 0)
                            {
                                siteName[j - 1] = siteName[j];
                                j++;
                            }
                            siteName[j - 1] = save;                        }
                        //clean out sentinel so it's not printed
                        siteName[siteName.Length-1] = null;                        Console.WriteLine("Done sorting");
                        break;
                        //Print a report
                    case "r":
                    case "R":
                        string filter = "";
                        string response = "";                        //If user wants to filter,get filter string
                        Console.Write("Would you like a Filter?");
                        response=Console.ReadLine();                        if(response.ToUpper() =="Y")
                        {
                            Console.Write("/nPlease enter a filter:");
                            filter = Console.ReadLine();
                        }                        Console.WriteLine("");
                        Console.WriteLine("Site Report");
                        Console.WriteLine("");                        //Process every entry in siteName
                        foreach(string site in siteName)
                        {
                            //Execute filter
                            if(response.ToUpper() == "Y" && site != null & site.IndexOf(filter) == -1)
                            {
                                continue;
                            }                            //Print non-filtered items
                            Console.WriteLine("/t {0}",site);
                      }
                        break;                        //Exit Program
                    case "q":
                    case "Q":
                        Console.WriteLine("GoodBye");
                        break;                        //User entered bad data
                    default:
                        Console.WriteLine("Huh??");
                        break;
              }//end swith             //keep going until user wants to quit 
         }while((choice = choice.ToUpper()) != "Q");            return 0;
        }
    }
}