I am new to programming and as seems to be traditional I tried to create a "hello world" program in C#; however, as soon as I run the program it closes.
This is my code inside:
main()
console.writeline("hello world");
console.writeline("enter name");
console.writeline("where is the frikin console");
It's really annoying and I know it might be something simple for the additional users but how do I keep the window open.
Use Console.ReadLine(); or Console.ReadKey(); at the end of your program to wait for the return key or for any key.
You can build your program and run the exe from the command line, that will allow you to see the output.
If you want the program to remain running then adding the Read() statement is the traditional approach, as others have already said.
If you just want to see it in debugging and do not want or need the read statement then place a breakpoint at the end of the program during a debug session.
It's really quite simple.
After this line of code:
Console.WriteLine("where is the frikin console");
You need to add this:
Console.ReadLine();
That should work.
The reason the console closes is because you told it to write some stuff to the screen, after it has finished writing what you told it to write it simply closes itself all in the fraction of a second. if you add Console.ReadLine, the console will wait for you to input something before closing, like pressing a key on the keyboard.
Try adding Console.Read(). You need to pause execution somehow.
Console.WriteLine("hello world");
Console.WriteLine("enter name");
Console.WriteLine("where is the frikin console");
Console.ReadLine();
Console.ReadLine(); will close the console after you've hit (for example) enter.
Console.ReadKey(); will close the console after the next key-hit
You can read the console-contents with these methods,too
Console.WriteLine("hello world");
Console.WriteLine("enter name");
string name = Console.ReadLine();
Console.WriteLine("Your name is: " + name);
Console.ReadLine();
add below line at the end
Console.ReadLine();
You could use CTRL + F5 which will opens the command line and after execution of your code, it shows Press any key to continue.... This will be handy for you than adding few lines of code additionally.
Use
Console.ReadLine();
in the end of your code. You are having this problem because the program just write the message then it ends, that's why you can't see anything. By adding that line, you keep the program waiting something to be typed and you can read the message. After this, type something to end the program.
The window automatically closes after your program, you need to let it take some input, for example:
Add
Console.ReadLine();
Which takes a line of input (till "\n"). And your program will wait until somebody hit the return key (they can type anything and the program won't close: until you hit the return key. You can type in "hello world back what's up are you ok?" and nothing will happen.)
or
Console.ReadKey();
Which will take a character of input. This will make your program wait for the user to press any key and then closes.
Related
when i run my code, my console suddenly shuts off after a number is entered into the console.
int age;
Console.WriteLine("How old are you?");
age = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("You are {0} years old", age);
can someone help me with this problem? I never get to see the end result because it just shuts off. there are no errors that pop up but it is getting quite frustrating.
Add Console.ReadLine() or Console.ReadKey() as your last line.
When the execution of the program is done, the console windows closes. You have to make a way for a program to keep running so the console window stays open. Usually, this is achieved by adding
Console.ReadKey();
or
Console.ReadLine();
in the end of your code. This way the console is waiting for your input and it stays open. As soon as you hit any key in keyboard (in case of Console.ReadKey()) or Enter key (in case of Console.ReadLine()), execution is done and the console window exits.
On Visual Studio, the C# Console application keeps on terminating when I try to run a program. I tested this by just writing Hello World, shown here:
(screenshot of what I wrote)
When I run it, the command prompt window appears for a second, then immediately closes. Is there a way to fix this?
When a console application runs it executes the code and exits, console applications do not have a message loop to keep them alive, it is the same as creating a batch file and double clicking it, the command window will open and then close when execution finishes. If you want then console window to hang around afterwards then you need to use Console.ReadLine(); which will wait for user input before closing (i.e. pressing Enter).
You code (which should be in your question) simply outputs some text to the console and then exits.
Suggested reading Creating a Console Application
class Program
{
static void Main (string[] args)
{
Console.WriteLine("Hello World");
Console.ReadLine();
}
}
The application is not crashing, it runs and then exits. If you want read the output after it's done you can use Console.ReadLine();
using System;
namespace Hello_World
{
class Program
{
static void Main (string[] args)
{
Console.WriteLine("Hello World");
Console.ReadKey();
}
}
}
The issue is not crashing really but that all the instructions are executed then the program exits. If you desire to pause, you could insert the statement:
Console.ReadKey();
which will wait for you to type a key to exit.
I have the following code in a C# console application:
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hello...");
}
}
When I run this application, the command prompt appears and suddenly disappear, but I have seen at my friend's house when I run the application, the command prompt asks to Press any key to Continue. When I press any key after then the application terminates.., but in my PC it doesn't work without writing Consol.ReadLine().
Is there a setting to get the user to the Press Any Key to Continue line?
Sadly no, but if you Debug->Start Without Debugging Ctrl+F5 it will make that effect.
Clearly you could add
Console.Write("\nPress Any Key to Continue");
Console.Readkey();
at the end of your program.
If you want to be (nearly) sure that your code will always show that prompt:
AppDomain.CurrentDomain.ProcessExit += (sender, e) =>
{
Console.Write("\nPress Any Key to Continue");
Console.ReadKey();
};
Put these lines at the beginning of your Main() method.
But I think this is a little overboard :-) It installs an exit handler that will ask for a key on exit.
Now, if you want to really really go overboard and show, you can go up to eleven:
if (Debugger.IsAttached)
{
AppDomain.CurrentDomain.ProcessExit += (sender, e) =>
{
Console.Write("\nPress Any Key to Continue");
Console.ReadKey();
};
}
This will ask for the key only if the debugger is attached (even these lines have to be put at the beginning of the Main() method. They replace the other versions). With Start Without Debugging the debugger isn't attached, so Visual Studio will show its prompt instead of yours.
(Instead of using the AppDomain.CurrentDomain.ProcessExit, you could have protected the whole Main() with a try...finally block, and in the finally put the Console.*, but that wasn't funny :-) )
Disappearing is the correct behaviour. If you want it to appear this way just add
Console.ReadKey(); Of course you can add some message before ("Press any key...") etc.
I've got a console app. I prompt the user for input...my code does its thing and at the end tries to print the output back to the user.
Here's how I try to post back the output to the same console window so they can see the results:
Console.WriteLine( "Output: ");
Console.WriteLine(resultMessage);
Problem is my console closes before it shows the resultMessage.
You can use Console.ReadKey(true); it waits for any key press
When you're in VS, you can also press Ctrl and f5 to open your application outside of the debugger.
A consequence of doing so is that your window will stick around when your program is finished saying
Press any key to continue
One more Console.Read...
if (Debugger.IsAttached)
{
Console.Write("Press Enter to exit: ");
Console.ReadLine();
}
I think it will be better in case of using output redirection to file like
ConsoleApp.exe >results.txt
Use Console.ReadKey(); after the output is written to the console.
I'm writing a sample console application in VS2008. Now I have a Console.WriteLine() method which displays output on the screen and then there is Console.ReadKey() which waits for the user to end the application.
If I press Enter while the Console.WriteLine() method is displaying then the application exits.
How can I clear the input buffer before the Console.ReadKey() method so that no matter how many times the user presses the Enter button while the data is being displayed, the Console.ReadKey() method should stop the application from exiting?
Unfortunately, there is no built-in method in Console class. But you can do this:
while(Console.KeyAvailable)
Console.ReadKey(false); // skips previous input chars
Console.ReadKey(); // reads a char
Use Console.ReadKey(true) if you don't want to print skipped chars.
Microsoft References
Console.KeyAvailable
Console.ReadKey(bool)