将文本写出到控制台输出作为输入

Question

I'm writing a console application with C# and there is a question at the beginning of the program:

Console.WriteLine("Would you like to create the config folder? (y/n)");

I would like to set a default "y" after this line, so it's enough to the user just to press the Enter. (or delete it with backspace if (s)he wants "n")

Is this even possible? How?

Answer 1

Just use

Console.WriteLine("");
Console.Write("y")

so Y is on the next line and they just have to press enter.

Answer 2

That behavior is a bit strange, in my opinion. What I would do is this:

Console.WriteLine("Would you like to create the config folder? (Y/N) [Y]");

ConsoleKey optionKey;
do
{
    ConsoleKeyInfo key = Console.ReadKey(true);
    optionKey = key.Key == ConsoleKey.Enter ? ConsoleKey.Y : key.Key;
} while (optionKey != ConsoleKey.Y && optionKey != ConsoleKey.N);

Console.WriteLine(optionKey);

if (optionKey != ConsoleKey.N)
{
    // Do your stuff
}

Answer 3

The correct behavior here should be show something like

Console.WriteLine("Would you like to create the config folder? (y/n) [y]");

This tells the user that y is the default and by just pressing enter it would be auto selected. I think this would be faster in case a user want to select n because then the user don't have to delete y and then enter his/ choice.

Consider if the user has to go through multiple question and have to select n for all of them. It would be a little annoying.

Simple way to code (just a pseudo-code) it is:

boolean selection = true; //false if 'n' is default
if(userinput == 'n') selection = false;

If you still want to write a changeable output use:

Console.WriteLine("Would you like to create the config folder? (y/n)");
SendKeys.SendWait("y");
Console.ReadLine();