I am writing a simple C# console application in VS 2013 but the problem is that output screen flashes for a moment and disappears suddenly . I use the alternate way and write Console.Readline() method in the end and problem is fixed .So but i personally think that this is just a trick to stop the screen and not the proper way.So can anyone explain me the proper way of doing this ??
The program immediately closes because there's nothing stopping it from closing. Insert a breakpoint at return 0; or add Console.Read(); before return 0; to prevent the program from closing.
After you are done with your program, press Ctrl+F5 ( Run without
debugging). This will prompt before closing the window and this is
what you want.
Or use this line at the end
Console.ReadKey();
No, this is the correct way of doing it. Console.ReadLine() and Console.ReadKey() are a blocking statement: they halt the thread to wait for input before continueing. If you wouldn't do this the program would reach its end and thus exit the console.
In a larger console program you might have a while(running) loop instead and a GUI won't have this problem until its GUI thread is explicitly stopped (closing the window), but for a simple console app you can just use this 'trick'.
Yes, as long as you don't stop the application it keeps running and ends when done processing.
That's why you need the Console.ReadLine(), it stops processing and waits until you tell it to continue.
when you run the program in Debug mode if you do'nt have any BreakPoints or if .NET engine does not need to Read IO from user then it just finishes the excution without waiting anymore.
if you want to stop the execution at the end want to see the console screen you can either use any IO Read Statements as below:
Console.ReadLine();
Console.Read();
Console.ReadKey();
OR
You can run your program in without Debugging mode by simply pressing Ctrl+F5
Related
This question already has answers here:
Why is the console window closing immediately once displayed my output?
(15 answers)
Closed 5 years ago.
My console applications on Visual Studio are closing automatically once the program finishes the execution. I'd like to "pause" the applications at the end of their execution so that I can easily check the output. How can I achieve that?
Update:
As of Visual Studio 2017, there's a built-in option in the IDE at:
Tools > Options > Debugging > Automatically close the console when debugging stops
Unchecking it will automatically pause the application at the end of the execution, allowing you the easily check its output without having to add extra code to your application.
There are two ways;
Console.ReadLine();
ReadLine() waits for ↩
or
Console.ReadKey();
ReadKey() waits for any key (except for modifier keys).
You can just compile (start debugging) your work with Ctrl+F5.
Try it. I always do it and the console shows me my results open on it. No additional code is needed.
Try Ctrl + F5 in Visual Studio to run your program, this will add a pause with "Press any key to continue..." automatically without any Console.Readline() or ReadKey() functions.
Console.ReadLine() to wait for the user to Enter or Console.ReadKey to wait for any key.
Use:
Console.ReadKey();
For it to close when someone presses any key, or:
Console.ReadLine();
For when the user types something and presses enter.
Alternatively, you can delay the closing using the following code:
System.Threading.Thread.Sleep(1000);
Note the Sleep is using milliseconds.
Ctrl + F5 is better, because you don't need additional lines.
And you can, in the end, hit enter and exit running mode.
But, when you start a program with F5 and put a break-point, you can debug your application and that gives you other advantages.
Those solutions mentioned change how your program work.
You can off course put #if DEBUG and #endif around the Console calls, but if you really want to prevent the window from closing only on your dev machine under Visual Studio or if VS isn't running only if you explicitly configure it, and you don't want the annoying 'Press any key to exit...' when running from the command line, the way to go is to use the System.Diagnostics.Debugger API's.
If you only want that to work in DEBUG, simply wrap this code in a [Conditional("DEBUG")] void BreakConditional() method.
// Test some configuration option or another
bool launch;
var env = Environment.GetEnvironmentVariable("LAUNCH_DEBUGGER_IF_NOT_ATTACHED");
if (!bool.TryParse(env, out launch))
launch = false;
// Break either if a debugger is already attached, or if configured to launch
if (launch || Debugger.IsAttached) {
if (Debugger.IsAttached || Debugger.Launch())
Debugger.Break();
}
This also works to debug programs that need elevated privileges, or that need to be able to elevate themselves.
If you do not want the program to close even if a user presses anykey;
while (true) {
System.Console.ReadKey();
};//This wont stop app
I am making a windows-form which contains a console. now when the console is openend and i later close either the console or the form( automaticly closes console too ) The proces of the console stays online when i look inside the taskmanager.
How is this possible? and why is this happening?
And, when i call the console it somehow doesn't get updated. this means
when i make any changes in the console inside visual studio, than save, start the program. It still uses the version BEFORE the save.
How is this possible, and why is this happening?
thank you
EDIT:
I have a seperate project in my solution called "parts' this is the console. I start i using
Console = Process.Start(#"C:\Users\Krijn\Desktop\CarWorks\Parts\bin\Debug\Parts");
As aleady mentioned you start a new process. The new process is independent from the one starting it. You need to terminate the started process yourself, I would suggest something like this:
Process consoleProcess = Process.Start(#"C:\Users\Krijn\Desktop\CarWorks\Parts\bin\Debug\Parts");
// Do some stuff here...
if (!consoleProcess.HasExited)
{
// Terminate the process
consoleProcess.Kill();
}
// Wait until the process is really terminated.
consoleProcess.WaitForExit();
I have c# application that I am running, and then in some point application throws an error which is then catched, then app should end. And it ends, but console windows stays open...
I even checked in windows task manager, under applications tab, there is listed my console, but when I click go to process, there is no process of that application.
Thats weird... Application ended, process ended, but console stays on? How can I kill that console?
Edit: my code:
static class Program
{
static void Main()
{
try
{
//bunch of static methods from other static classes are being invoked
Setup.Driver.Close();//another static method
}
catch (Exception)
{
Setup.Driver.Close();
}
}
}
Second edit: Note: Process.Getprocess().Kill(), Application.Exit(), Environment.Exit() are not working for me, in windows task manager, there is no process left to kill, only console stays open!
Environment.Exit(0);
or
this.Close();
If you have threads running, you can try this brute force method before you call Exit:
using System.Diagnostics;
ProcessThreadCollection currentThreads = Process.GetCurrentProcess().Threads;
foreach (var thread in currentThreads)
{
thread.Interupt(); // If thread is waiting, stop waiting
// or
thread.Abort(); // Terminate thread immediately
// or
thread.IsBackGround = true;
}
Environment.Exit and Application.Exit
Environment.Exit() is cleaner.
http://geekswithblogs.net/mtreadwell/archive/2004/06/06/6123.aspx
Good morning,
is the console app not closing when you start it from Visual Studio with the debugger attached or is it also not closed when you launch it from the file system / without attached debugger?
When the debugger is attached, you will always see an 'Press ENTER to exit ...' (or similar message).
When talking about the task manager - do you see the *.vshost process in there?
If yes, this is 'required' by Visual Studio and is not your 'real' console application; you will always see a *.vshost process when launching executables from within Visual Studio.
Hope this helps
Your program is most likely linked to another process which keeps it open.
In my case, the process was chromedriver.
Check your processes and your code to see what you opened and what's still running in the background.
I was stuck with this issue too. Once I was done with the browser, I just used Driver.Close(); However, doing this still kept chromedriver running in the background. So instead I used Driver.Quit(); . Then I made sure to return; from the Main method.
Hope this helps!
Environment.Exit();
will this work?
This question already has answers here:
Why is the console window closing immediately once displayed my output?
(15 answers)
Closed 5 years ago.
My console applications on Visual Studio are closing automatically once the program finishes the execution. I'd like to "pause" the applications at the end of their execution so that I can easily check the output. How can I achieve that?
Update:
As of Visual Studio 2017, there's a built-in option in the IDE at:
Tools > Options > Debugging > Automatically close the console when debugging stops
Unchecking it will automatically pause the application at the end of the execution, allowing you the easily check its output without having to add extra code to your application.
There are two ways;
Console.ReadLine();
ReadLine() waits for ↩
or
Console.ReadKey();
ReadKey() waits for any key (except for modifier keys).
You can just compile (start debugging) your work with Ctrl+F5.
Try it. I always do it and the console shows me my results open on it. No additional code is needed.
Try Ctrl + F5 in Visual Studio to run your program, this will add a pause with "Press any key to continue..." automatically without any Console.Readline() or ReadKey() functions.
Console.ReadLine() to wait for the user to Enter or Console.ReadKey to wait for any key.
Use:
Console.ReadKey();
For it to close when someone presses any key, or:
Console.ReadLine();
For when the user types something and presses enter.
Alternatively, you can delay the closing using the following code:
System.Threading.Thread.Sleep(1000);
Note the Sleep is using milliseconds.
Ctrl + F5 is better, because you don't need additional lines.
And you can, in the end, hit enter and exit running mode.
But, when you start a program with F5 and put a break-point, you can debug your application and that gives you other advantages.
Those solutions mentioned change how your program work.
You can off course put #if DEBUG and #endif around the Console calls, but if you really want to prevent the window from closing only on your dev machine under Visual Studio or if VS isn't running only if you explicitly configure it, and you don't want the annoying 'Press any key to exit...' when running from the command line, the way to go is to use the System.Diagnostics.Debugger API's.
If you only want that to work in DEBUG, simply wrap this code in a [Conditional("DEBUG")] void BreakConditional() method.
// Test some configuration option or another
bool launch;
var env = Environment.GetEnvironmentVariable("LAUNCH_DEBUGGER_IF_NOT_ATTACHED");
if (!bool.TryParse(env, out launch))
launch = false;
// Break either if a debugger is already attached, or if configured to launch
if (launch || Debugger.IsAttached) {
if (Debugger.IsAttached || Debugger.Launch())
Debugger.Break();
}
This also works to debug programs that need elevated privileges, or that need to be able to elevate themselves.
If you do not want the program to close even if a user presses anykey;
while (true) {
System.Console.ReadKey();
};//This wont stop app
I've "inherited" a legacy C#/C++ program that I have to debug. The current problem is that the .exe won't stop after I close the program, i.e. it still shows up in Task Manager.
This is a problem, because it won't let me restart the program, because only one instance can run. Often killing the process doesn't work; I'm forced to reboot.
I was under the impression that when the main program stopped, all the child threads were also supposed to stop, but I may be wrong.
Q: What would cause a .exe to not stop?
Child threads will not stop automatically unless they have been specifically set as background threads (i.e., with thread.IsBackground = true).
Edit: It is also possible that the main thread isn't terminating when the form is closed (i.e., there's other code that is set to run after close that isn't completing).
I find it useful to attach to the running process with the debugger and press the pause button. After that I would inspect the Threads window and see what the stack trace is doing for each of the executing threads. The threads window is hidden by default. Here is more information about how to show it and use it:
http://msdn.microsoft.com/en-us/library/w15yf86f.aspx
My guess would be that all threads aren't stopped. Usually you can end task the program and it will stop though. Maybe one thread has hung on to a system resource that's more difficult to release.
If you can get a debug build, run the program and after the program is "exited", hit the pause button in the debug window. At that point you can look through the threads and find out which one is hung. To help, you should name your threads when they get created (it's an extra parameter in the .Start function)
You may want to look into process explorer. It makes it easier to shut down the programs and it can view the threads of the program and potentially point you in the right direction of where to make the the program behave.
At the most frundamental level, there is an infinite loop somewhere.
Is the startup form the one that's being closed to exit the application? If it isn't you need to put Application.Exit() or Environment.Exit() in the form.closed event of the form that is closing last.