My c# console application is used as a login for my c# form application, the problem is, in my c# console app i haven't been able to figure out a way to ReadLine without the need of pressing Enter because i need to detect whether F2 or Enter is pressed then ReadLine without needing user to press Enter again. For example, if i wanted to detect if F2 is pressed i would need to wait until F2 is pressed until I'm able to ReadLine, Hopefully this question was worded in a way that it makes sense, I'm sure you can tell I'm quite a 'noob' at c#.
Example of my problem:
static void Main()
{
var KP = Console.ReadKey();
if (KP.Key == ConsoleKey.F2)
{
//User Presses F2
}
else if (KP.Key == ConsoleKey.Enter)
{
string UserName = ReadLineWithoutPressingEnter();//Just a example
//ReadLine without needing to press enter again
}
}
Thank you for your time.
Save the result from ReadKey and then just do a ReadLine:
public static void Main(string[] args)
{
var KP = Console.ReadKey();
if (KP.Key == ConsoleKey.F2)
{
return;
}
string UserName = KP.KeyChar + Console.ReadLine();
Console.WriteLine(UserName);
Console.ReadLine();
}
You've already found Console.ReadKey(). That's a start. You'll need to also build a state machine around this function to return a completed string at the end of the line, but this method is the key to making that work. Don't forget to handle things like backspace and delete.
Here is an example Try this
static void Main(string[] args)
{
ConsoleKeyInfo cki = new ConsoleKeyInfo();
int i = 0;
do
{
while (Console.KeyAvailable == false)
Thread.Sleep(250); // Loop until input is entered.
cki = Console.ReadKey(true);
if (cki.Key == ConsoleKey.F1)
{
Console.WriteLine("User Have Press F1");
//do some thing
}
if (cki.Key == ConsoleKey.Enter)
{
Console.WriteLine("User Have Press Enter");
//do some thing
}
if (cki.Key == ConsoleKey.A)
{
Console.WriteLine("User Have Press A");
//do some thing
}
} while (cki.Key != ConsoleKey.X);
}
This should work
static void Main(string[] args)
{
ConsoleKeyInfo e;
string userName = "";
while (true)
{
e = Console.ReadKey();
if (e.Key == ConsoleKey.Enter)
{
break;
}
else if (e.Key == ConsoleKey.F2)
{
//things to do when F2
}
userName += e.KeyChar;
}
Console.WriteLine("username: " + userName);
Console.Read();
}
Related
Suppose a user is asked for the manual. Now we all know that manuals are handy and extensive, how do I collapse/clear for instance so that the user can proceed to the next activity? By pressing C after pressing M, I want the user to immediately jump to the next acitivity.
How do I remove this?
Here is the code:
static void Main(string[] args)
{
Console.WriteLine("Do you want to play the game?\nPress Y to continue\tPress M to view the rules\tEnter any key to exit. ");
string iQuestion = Console.ReadLine();
if (iQuestion.Equals("y", StringComparison.OrdinalIgnoreCase))
{
ProjectExecution();
Console.WriteLine("\nWorld you like to try again?\nPress y to play again\tEnter any key to exit. ");
string ask = Console.ReadLine();
if (ask.Equals("y", StringComparison.OrdinalIgnoreCase))
{
ProjectExecution();
}
else
{
Console.WriteLine("Thank you for playing");
}
Console.Read();
}
else if (iQuestion.Equals("m", StringComparison.OrdinalIgnoreCase))
{
Console.WriteLine("Hwewewe\nPress C to continue");\\This is just an example
string mQuestion = Console.ReadLine();
if (mQuestion.Equals("c", StringComparison.OrdinalIgnoreCase))
{
Console.Clear();
ProjectExecution();
Console.Read();
}
}
else
{
Environment.Exit(10);
}
}
I am open to another solution.
I am attempting to make a simple program that counts up one each time I press spacebar. I am very very new to writing software and most of this is completely foreign to me, so if you understand how I am thinking incorrectly I will welcome your insight!
using System;
namespace Counter
{
class Program
{
static void Main(string[] args)
{
var tap = 0;
while (Console.ReadKey(true).Key != ConsoleKey.Spacebar)
tap++;
Console.WriteLine();
}
}
}
This is what I tried. The console shows (0) and then closes when I press spacebar. I don't know how to stop it from closing the console, it's as if all it has in the code body is a variable and "Console.WriteLine()".
try this:
var tap = 0;
while (Console.ReadKey(true).Key != ConsoleKey.Spacebar)
{
tap++;
Console.WriteLine($"Key is not Spacebar, tap count = {tap}");
}
Console.WriteLine("You just press spacebar, now press enter to exit this console app");
Console.ReadLine();//press enter to exit
static void Main(string[] args)
{
int tap = 0;
while (Console.ReadKey(true).Key == ConsoleKey.Spacebar)
{
tap++;
Console.WriteLine("You pressed 'Spacebar' " + tap + "-time(s) so far.");
}
Console.WriteLine("You didn't press 'Spacebar' this time!");
System.Threading.Thread.Sleep(3000); // wait 3 seconds so you actually have the chance to read the text in the console
}
Event though I would recommend something like this instead:
static void Main(string[] args)
{
int tap = 0;
while(true)
{
if(Console.ReadKey(true).Key == ConsoleKey.Spacebar)
{
tap++;
Console.WriteLine("You pressed 'Spacebar' " + tap + "-time(s) so far.");
}
else
{
Console.WriteLine("You didn't press 'Spacebar' this time!");
System.Threading.Thread.Sleep(3000); // wait 3 seconds so you actually have the chance to read the text in the console
break;
}
}
}
I don't know if this is how to resolve a question in stackoverflow, but the answer was to make an if/elseif loop where Spacebar was an input that was counted and Enter was a Boolean value that closed the program when triggered to True.
{
var tap = 0;
bool quit = false;
while (quit == false)
{
if (Console.ReadKey().Key == ConsoleKey.Spacebar)
{
tap++;
Console.WriteLine(tap);
}
else if (Console.ReadKey(true).Key == ConsoleKey.Enter)
{
quit = true;
}
}
}
With the ElseIf I was able to count every trigger of Spacebar, whereas previously I had that statement within the If loop and it waited on the next keypress to see whether it was the Enter key or not.
Thanks for the help!
I'd like to make the C# console only accept input from the Enter key on the startup screen.
I've made it so that it closes the console when anything but the Enter key is pressed.
How can I make it so that the console only accepts input from the Enter key so that the application doesn't close when I press anything else, and then receive normal input afterwards?
class Program
{
public static void ClearKeyBuffer()
{
while (Console.KeyAvailable)
Console.ReadKey(true);
}
public static void Main (string[] args)
{
int attempts = 0;
int displayattempts = 5;
bool validentry;
Console.WriteLine("Please press enter to begin");
var key = System.Console.ReadKey(true);
if (key.Key == ConsoleKey.Enter)
{
while (attempts < 5)
{
string input;
attempts = (attempts + 1);
Console.Clear();
Console.WriteLine("Please wait...");
Thread.Sleep(5000);
Console.Clear();
Console.WriteLine("Please enter your user number.");
Console.WriteLine("Attempts Remaining:" + displayattempts);
ClearKeyBuffer();
Console.WriteLine(" ");
input = Console.ReadLine();
{
if (input == "5573")
{
validentry = true;
}
else
{
validentry = false;
}
if (validentry == false)
{
displayattempts = (displayattempts - 1);
Console.Clear();
Console.WriteLine("Error: Invalid number ID entered. Please wait 5
seconds, and try again.");
Thread.Sleep(5000);
}
else if (validentry == true)
{
Console.Clear();
Console.WriteLine("Welcome Samuel");
ValidUserEntry();
}
}
}
}
if (displayattempts == 0)
{
Console.Clear();
Console.WriteLine("Error: You have entered the wrong number ID too many times.
This system will now close in 5 seconds...");
Thread.Sleep(5000);
Environment.Exit(0);
}
}
public static void ValidUserEntry()
{
ClearKeyBuffer();
Console.Clear();
Console.WriteLine("Please wait...");
Thread.Sleep(5000);
ClearKeyBuffer();
Console.Clear();
Console.WriteLine("What would you like to do?");
Console.ReadLine();
}
}
Add this line before first if. Then remove if statement and the var key... line.
while (Console.ReadKey(true).Key != ConsoleKey.Enter);
Alternative, more verbose version:
ConsoleKeyInfo key;
do
{
key = Console.ReadKey(true);
} while (key.Key != ConsoleKey.Enter);
I have created a small project . and here is it:
class Program
{
public static void Main()
{
Console.WriteLine("Welcome");
Console.WriteLine("1 to go to Data Files ");
Console.WriteLine("type quit to exit");
string input = Console.ReadLine();
if (input == "1")
{
Data go = new Data();
}
else if (input == "quit")
{
}
}
}
When user type quit. I want my program to exit. anyone help me, please
You just need something like this:
else if (input == "quit")
{
return;
}
Update: based on your comments I think you're looking for something like this:
class Program
{
public static void Main()
{
while(true)
{
Console.WriteLine("Welcome");
Console.WriteLine("1 to go to Data Files ");
Console.WriteLine("type quit to exit");
string input = Console.ReadLine();
if (input == "1")
{
Data go = new Data();
}
else if (input == "quit")
{
return;
}
else
{
Console.WriteLine("invalid option");
}
}
}
}
You just can use Environment.Exit(code). where code is integer representation of standard application-exit-codes like return 0 or return 1 in world of C++.
I have the following:
class Program {
static void Main(string[] args) {
}
}
Is there a simple way that I can make this wait for a key to be pressed and then call a function. For example: call function funcA() if an "a" is pressed, funcB() if a "b" is pressed or exit if an "e" is pressed?
var c = Console.ReadKey();
switch (c.KeyChar)
{
case 'a':
funcA();
break;
case 'b':
funcB();
break;
}
you use this code Console.ReadKey();
MSDN : Console.ReadKey Method - Obtains the next character or function key pressed by the user. The pressed key is displayed in the console window.
You can do like this -- just need to replace the key value over here with the key you
want...that will do work for you
public static void Main()
{
ConsoleKeyInfo cki;
// Prevent example from ending if CTL+C is pressed.
Console.TreatControlCAsInput = true;
Console.WriteLine("Press any combination of CTL, ALT, and SHIFT, and a console key.");
Console.WriteLine("Press the Escape (Esc) key to quit: \n");
do
{
cki = Console.ReadKey();
Console.Write(" --- You pressed ");
if((cki.Modifiers & ConsoleModifiers.Alt) != 0) Console.Write("ALT+");
if((cki.Modifiers & ConsoleModifiers.Shift) != 0) Console.Write("SHIFT+");
if((cki.Modifiers & ConsoleModifiers.Control) != 0) Console.Write("CTL+");
Console.WriteLine(cki.Key.ToString());
} while (cki.Key != ConsoleKey.Escape);
}