System.Console.TreatControlCAsInput is backwards in .NET 5 RC.1

[TylerLeonhardt]

Description

See the following code:

using System;
using System.Threading;

var a = Console.TreatControlCAsInput;
Console.TreatControlCAsInput = true;

var key = Console.ReadKey(true);
Console.WriteLine("KEY: " + key.Key);
Console.WriteLine("MODS: " + key.Modifiers);

Console.TreatControlCAsInput = a;

Now run dotnet run and type Ctrl+C

You would expect to see:

KEY: C
MODS: Control

because TreatControlCAsInput is true, but you don't - it interupts the process.

Now set this instead in the example above

Console.TreatControlCAsInput = false;

Now run dotnet run and type Ctrl+C... you get:

KEY: C
MODS: Control

when I would expect the process to be interupted.

Configuration

• Which version of .NET is the code running on? .NET 5 RC1
• What OS and version, and what distro if applicable? macOS Catalina
• What is the architecture (x64, x86, ARM, ARM64)? x64
• Do you know whether it is specific to that configuration? No. It could be others. Not sure.

Regression?

Yes. This worked in preview 8. Setting:

Console.TreatControlCAsInput = true;

would allow ReadKey to return a KeyInfo and

Console.TreatControlCAsInput = false;

would cause Ctrl+C to interupt the process.

Other information

Tagging subscribers to this area: @eiriktsarpalis, @jeffhandley
See info in area-owners.md if you want to be subscribed.

[tmds]

The logic got inverted unintentionally in #39206. This PR will restore it: #42432.