Console.ReadKey(false) in C# something fishy about it

Question

i am trying to make a simple application in C# in which every character I type is displayed in a console window. Here is my code :

class Program {
    static void Main(string[] args) {
        while (true) {
            System.ConsoleKeyInfo input;
            input = Console.ReadKey(false);
            String d = input.ToString();
            char c = d[0];
            Console.WriteLine(c);
        }
    }
}

The problem is that the characters are not displayed correctly, and to be more precise, every character is followed by an 'S'. For example i type 'a' and i get 'aS' instead of 'a'. Any solutions? Thnx in advance!

Answer 1

What you are seeing is the following:

• The original character you entered, since you passed false not true to ReadKey
• The first characters of the string "System.ConsoleKeyInfo", since the ToString() method returns the typename (here), not the character entered.

Use the following code instead to achieve what you attempted:

while(true)
{
    ConsoleKeyInfo info = Console.ReadKey(true);
    Console.WriteLine(info.KeyChar);
}

Answer 2

因为input.ToString() == "System.ConsoleKeyInfo" :-)根据您要执行的操作，请尝试编写input.KeyChar 。

Answer 3

The parameter of Console.ReadKey(false); defines if the key you type is intercepted or not. So Console.ReadKey(false); prints the character you type and Console.Writeline(c) prints the S .

Answer 4

Try char c = input.KeyChar; instead.

Answer 5

The problem is that you are using ToString() on a System.ConsoleKeyInfo . When this is turned into a string you will get "System.ConsoleKeyInfo" and the first character is therefore 'S' . Did you mean to write the following code instead?

while (true)
{
    var input = Console.ReadKey(false);
    Console.WriteLine(input.KeyChar);
}

With that code each character will get duplicated (so you will get aabbccddee ). Change the false to true in ReadKey to fix that.