问题
i am new in C# and working on Console Applications now a days i wrote the following code :
Program.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Ch06Ex01
{
class Program
{
static void Write()
{
Console.WriteLine("Please enter any string..!!");
}
static void Main(string[] args)
{
Write();
string name = Console.ReadLine();
Write();
string name1 = Console.ReadLine();
Write();
string name2 = Console.ReadLine();
Write();
string name3 = Console.ReadLine();
Console.WriteLine("{0}, {1}, {2}, {3}",name,name1,name2,name3);
Console.WriteLine("enter \"y\" to restart the program and \"n\" to exit the Program");
string selectedOption = Console.ReadLine();
if (selectedOption == "y")
{
// howto call static void Main(string[] args) here agin so that the program start itself from the start point
}
//else if (selectedOption == "n")
{
//Terminate the Program
}
Console.ReadKey();
}
}
}
Now at the point :
if (selectedOption == "y")
{
// howto call static void Main(string[] args) here agin so that the program start itself from the start point
}
i wanted to reboot the program if User enter "y" and terminate it if the user enter "n", for this purpose firs of all i tried to use goto statement like :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Ch06Ex01
{
class Program
{
static void Write()
{
Console.WriteLine("Please enter any string..!!");
}
static void Main(string[] args)
{
StartPoint;
Write();
string name = Console.ReadLine();
Write();
string name1 = Console.ReadLine();
Write();
string name2 = Console.ReadLine();
Write();
string name3 = Console.ReadLine();
Console.WriteLine("{0}, {1}, {2}, {3}",name,name1,name2,name3);
Console.WriteLine("enter \"y\" to restart the program and \"n\" to exit the Program");
string selectedOption = Console.ReadLine();
if (selectedOption == "y")
{
// howto call static void Main(string[] args) here agin so that the program start itself from the start point
goto StartPoint;
}
//else if (selectedOption == "n")
Console.ReadKey();
}
}
}
but it didn't work for me at StartPoint; it gives error that
Only assignment, call, increment, decrement, await, and new object expressions can be used as a statement C:\Users\Ahsan\Desktop\C# for Beginners Examples\Ch06Ex01\Ch06Ex01\Program.cs 18 13 Ch06Ex01
then i tried to call main function itself at point
if (selectedOption == "y")
{
// howto call static void Main(string[] args) here agin so that the program start itself from the start point
}
but it gives me a lot of error here , don' know how to do it now, can any one help me out ? don't know how to do this thing work.... calling " static void Main(string[] args) "in the class again would be preferred....
回答1:
Just call the method again, passing in the same arguments that where passed in initially, also try to avoid using goto if you can:
if (selectedOption == "y")
{
// howto call static void Main(string[] args) here agin so that the program start itself from the start point
Main(args);
}
回答2:
Firstly, your label is incorrect. The end of a label should have a colon character :.. so your label should have been this:
StartPoint:
However:
You should just loop until a condition is met. In this case.. the condition is to not restart:
bool running = true;
while (running) {
/*
* all of your other code
* should go here
*/
if (selectedOption != "y") {
running = false;
}
}
回答3:
You realy should not use a goto or call your Main again (recursion), do while is a better solution to repeat your logic muliple times:
string selectedOption;
do {
Write();
string name = Console.ReadLine();
Write();
string name1 = Console.ReadLine();
Write();
string name2 = Console.ReadLine();
Write();
string name3 = Console.ReadLine();
Console.WriteLine("{0}, {1}, {2}, {3}",name,name1,name2,name3);
Console.WriteLine("enter \"y\" to restart the program and \"n\" to exit the Program");
selectedOption = Console.ReadLine();
} while (selectedOption == "y")
Console.ReadKey();
回答4:
Try put the code that you will execute outside the main class in another method like
void execute()
{
Write();
string name = Console.ReadLine();
Write();
string name1 = Console.ReadLine();
Write();
string name2 = Console.ReadLine();
Write();
string name3 = Console.ReadLine();
Console.WriteLine("{0}, {1}, {2}, {3}",name,name1,name2,name3);
Console.WriteLine("enter \"y\" to restart the program and \"n\" to exit the Program");
string selectedOption = Console.ReadLine();
}
then in the main
static void Main(string[] args)
{
bool run = true
while(run){
execute()
Console.WriteLine("enter \"y\" to restart the program and \"n\" to exit the Program");
selectedOption = Console.ReadLine();
if (selectedOption == "n")
{
run = false;
}
}
}
回答5:
something like this :
static void Main(string[] args)
{
string selectedOption = "";
do
{
...........
}
while (selectedOption == "y")
if (selectedOption == "n")
{
//Terminate the Program
}
}
来源：https://stackoverflow.com/questions/19655806/how-to-call-static-void-mainstring-args-in-the-class-again