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;
}
}
}