Padre, Where did Lou come up with key press "a " is 65, key press "b " is 66, etc I know it ...

[G+_Cosmic Ray]

Padre,

Where did Lou come up with key press "a" is 65, key press "b" is 66, etc.

I know it's from Console.ReadKey().Key, but is there a table somewhere that shows all the equivalents to each key press? I tried Googling for it, and also looking on StackOverflow but couldn't find it.

thanks

[G+_Chris Hightower]

www.asciitable.com

[G+_Cosmic Ray]

Hello Chris,

Nice try, but from the table you linked to, "a" is 97, not 65.

"A" is 65, so there must be more to it.

 

In Lou's example, I can type either a or A and still get the same choice from the menu, but why? If the code is looking for 65, why does it accept 97 also?

[G+_Cosmic Ray]

Thanks, Neil.

 

Odd that you found that in the Visual Basic section. As the example is for using C#, I would have never thought to look there!

 

Yes, MSDN is a great source, if you know where to look.

 

I notice in the tables you linked to that there's no distinction between capital and lower case letters, which also seems odd.

[G+_Volkan Paksoy]

Good point. Console.ReadKey() method returns a ConsoleKeyInfo struct and we access Key property which is an enumeration called ConsoleKey (http://msdn.microsoft.com/en-us/library/system.consolekey(v=vs.110).aspx). 

I think the main point is we don't actually get the raw key value and apparently it is implemented to return case-insensitive values.

 

You can check the source code of the Console class and see how ReadKey() is implemented here: http://www.dotnetframework.org/default.aspx/DotNET/DotNET/8@0/untmp/whidbey/REDBITS/ndp/clr/src/BCL/System/Console@cs/2/Console@cs

 

Or you can use a tool like JustDecompile from Telerik (which is free) just to play around and browse through the framework. Sometimes it helps to check out the actual implementation.

[G+_Joe Maruschek]

I wrote a short program that prints out all the key codes that are in the ConsoleKey enum:

https://github.com/joemarus/Test1/blob/master/ListConsoleKey.cs

I hope it helps!

[G+_Charles Kelly]

I modified the example to use a ConsoleKeyInfo variable for user input. That allows the use of ConsoleKey.A or ConsoleKey.Escape when comparing instead of the numbers.

http://www.programming2dgames.com/files/Ep005rev2.cs