I've been following along a book I've been studying as I'm rather new to C# and one of the projects is to create a date of birth calculator using the console template on VSC. Now i'm sure I've followed the tutorial correctly but for some reason my program close on the last line to present the entered information and outputs
exited with code 0 (0x0)
This is what I've got:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace HelloWorldAgain
{
class Program
{
static void Main(string[] args)
{
string userName = "";
int userAge = 0;
int currentYear = 0;
Console.Write("Please enter your name: ");
userName = Console.ReadLine();
Console.Write("Please enter your age: ");
userAge = Convert.ToInt32(Console.ReadLine());
Console.Write("Please enter current year: ");
currentYear = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Hello World! My name is {0} and I am {1} years old. I was born in {2}.", userName, userAge, currentYear - userAge);
}
}
}
Console applications are designed to run and exit. You should add something to prevent it from finishing before you want it to. The standard way to do this is to wait for input using:
Console.ReadLine();
Add the Readline() to the end of your code:
Console.WriteLine("Hello World! My name is {0} and I am {1} years old. I was born in {2}.", userName, userAge, currentYear - userAge);
Console.ReadLine()
The exit 0 code means that the program has been finished without errors. After the last line, there is nothing left to execute, which means the application have done their job. If you want to keep the application "executing", you may use the trick of Console.ReadLine() , which simply wait to read something.
Exiting with code 0 is perfectly normal and generally indicates your program ran successfully.
If you run a console program from visual studio with the debugger it will close the terminal window when your program completes. IF you run without the debugger it will generally keep the window open until you press a key.
If you want the terminal to stay open in the debugger then either add a breakpoint to the last line of your code or add an additional Console.Readline at the end of your program
Related
This question already has answers here:
Why is the console window closing immediately once displayed my output?
(15 answers)
Closed 7 years ago.
I'm learning to program in C# and I'm having problems with the console, when I run the code below the console show the output but immediately close the window and I can't see anything. I don't know what to do to keep the window open. Any suggestion? I'll be very grateful.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace testApp_1
{
class Program
{
static void Main(string[] args)
{
String word = "Hello world!";
Console.WriteLine(word);
}
}
}
This happens because when you reach the last line, you also reach the end of the program, thus it terminates. To keep the console window open, just add
Console.ReadKey() as the last line.
The execution continues after writing to the console and then the program exits. you need to do something to pause the execution, usually you would read something from the console:
Console.ReadKey();
to pause until the user presses a key
so your whole program might look like:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace testApp_1
{
class Program
{
static void Main(string[] args)
{
String word = "Hello world!";
Console.WriteLine(word);
//if you want the user to exit with any key press do this
Console.WriteLine("Press any key to exit.");
Console.ReadKey();
//if you want the user to hit 'enter' to exit do this
Console.WriteLine("Press enter to exit.");
Console.ReadLine();
}
}
}
you can read about Console.ReadKey and Console.ReadLine on MSDN
Your code closes immediately, because it doesn't have anything else to do. What you'll want to do is to add this to the bottom of your code:
Console.Readline();
That will cause it to wait until you press Enter.
You can use following method to read some user input:
https://msdn.microsoft.com/de-de/library/system.console.readline%28v=vs.110%29.aspx
But you have to do some input.
You can also use logger frameworks: log4net:
http://logging.apache.org/log4net/
Console.ReadLine() is missing.
If you hit ctrl + F5 ( run without debugging) it will not close. But if you run with debugging, it will close after execution.
You can use Console.ReadLine(); in the end to wait for the user to hit return.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace testApp_1
{
class Program
{
static void Main(string[] args)
{
String word = "Hello world!";
Console.WriteLine(word);
Console.ReadLine();
}
}
}
I've a selfHost webapi console, and this console must run while executing integration tests.
In a normal way, the console ends with a "Hit ENTER to exit... ".
Here I can't press enter, so my idea was to kill process at the end.
But When I launch my console with ant I've :
"Launch ConsoleHost"
"Hit ENTER to exit... "
"Console ending ... "
I know that input is redirected.
So how is it possible to solve my problem ?
Change Console.ReadLine() in something else ?
call ant exec in another way (with input setted... to what) ?
I've try exec spawn, parallel process, ant-contrib forget/wait
Please help :)
Console code is very simple :
static void Main()
{
var host = new Host();
host.Start();
Console.ReadLine();
host.Stop();
Console.Out.WriteLine("Console ending ...");
}
I'm trying to run a program like a for loop. But when it starts debugging the console window disappears immediately. How do I stop this. I need something like press any key to continue.
Have a statement like
Console.Read()
That way, the console will remain until you press a key.
For more information, read here.
Write Console.ReadLine() or Console.Read() or Console.ReadKey() at the end of your program.
It will make your screen wait for your key press in order to exit.
I just found out that pressing the Ctrl + F5 key makes the console stay.
You didn't mention any example code. This is my example code. Program waits for pressing a key
class Program
{
static void Main(string[] args)
{
for (int i = 0; i < 3; i++)
{
Console.WriteLine(i);
}
Console.ReadKey();
}
}
When I run my program, the console window seems to run and close. How to keep it open so I can see the results?
class Program
{
public class StringAddString
{
public virtual void AddString()
{
var strings2 = new string[] { "1", "2", "3", "4", "5","6", "7", "8", "9"};
Console.WriteLine(strings2);
Console.ReadLine();
}
}
static void Main(string[] args)
{
StringAddString s = new StringAddString();
}
}
Put a Console.Read() as the last line in your program. That will prevent it from closing until you press a key
static void Main(string[] args)
{
StringAddString s = new StringAddString();
Console.Read();
}
If you want to keep it open when you are debugging, but still let it close normally when not debugging, you can do something like this:
if (System.Diagnostics.Debugger.IsAttached) Console.ReadLine();
Like other answers have stated, the call to Console.ReadLine() will keep the window open until enter is pressed, but Console.ReadLine() will only be called if the debugger is attached.
There are two ways I know of
1) Console.ReadLine() at the end of the program. Disadvantage, you have to change your code and have to remember to take it out
2) Run outside of the debugger CONTROL-F5 this opens a console window outside of visual studio and that window won't close when finished. Advantage, you don't have to change your code. Disadvantage, if there is an exception, it won't drop into the debugger (however when you do get exceptions, you can simply just rerun it in the debugger)
Console.ReadKey(true);
This command is a bit nicer than readline which passes only when you hit enter, and the true parameter also hides the ugly flashing cursor while reading the result :) then any keystroke terminates
You forgot calling your method:
static void Main(string[] args)
{
StringAddString s = new StringAddString();
s.AddString();
}
it should stop your console, but the result might not be what you expected, you should change your code a little bit:
Console.WriteLine(string.Join(",", strings2));
You can handle this without requiring a user input.
Step 1. Create a ManualRestEvent at the start of Main thread
ManualResetEvent manualResetEvent = new ManualResetEvent(false);
Step 2 . Wait ManualResetEvent
manualResetEvent.WaitOne();
Step 3.To Stop
manualResetEvent.Set();
Write Console.ReadKey(); in the last line of main() method. This line prevents finishing the console. I hope it would help you.
If your using Visual Studio just run the application with Crtl + F5 instead of F5. This will leave the console open when it's finished executing.
Use Console.Readline() at the end .Your code will not close until you close it manually.Since Readline waits for input that needs to be entered for your code hence your console will be open until you type some input.
For visual c# console Application use:
Console.ReadLine();
Console.Read();
Console.ReadKey(true);
for visual c++ win32 console application use:
system("pause");
press ctrl+f5 to run the application.
Make sure to useConsole.ReadLine();
to keep the preceeding Console.WriteLine(""); message from closing.
Console.Read()
-> Console stays open until you press a button on your keyboard
To be able to give it input without it closing as well you could enclose the code in a while loop
while (true)
{
<INSERT CODE HERE>
}
It will continue to halt at Console.ReadLine();, then do another loop when you input something.
If you're using Visual Studio, then the IDE has an option to keep the window open under
Tools > Options > Debugging >
Automatically close the console when debugging stops
Unlike CTRL + F5, this allows you to use breakpoints while debugging.
I am trying to create a super basic consol application why does the consol display for less then half a second and then exit?
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace MyHelloWorldApplication
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Test");
}
}
}
You are doing nothing after the Console.Writeline() method so the app will close.
Adding a Console.ReadKey() will stop the app from closing until you have pressed a key.
If you are using VisualStudio try CTRL + F5 or just F5 key. One of them will do the trick.
F5 - Will let you to run the application with debugging enabled.
CTRL + F5 - Will run application with out debugging.
Or Try:
Console.ReadLine();
At the end of Main method which will let program run until Enter key is pressed.
I presume you're debugging, in which case it disappears because execution of your program has finished.
Add a Console.ReadLine(); call to the end of your main method and it won't exit until you hit the return key.
it starts, runs, writes "Test" then closes.
add
Console.ReadLine();
after your WriteLine("Test") and it'll wait for you to press ENTER before closing.
using System.Threading;
Thread.Sleep(500);//500 msec.