ConsoleCtrlEventHandler仅在Windows下可用。您应该在Linux容器和Windows下使用System.Runtime.InteropServices.PosixSignalRegistration：

var isCancelRequested = false;
var signal = "none";
using (var protectSIGINTfromGC = PosixSignalRegistration.Create(PosixSignal.SIGINT, (signalContext) =>
{
    signal = "SIGINT";
    signalContext.Cancel = true;
    isCancelRequested = true;
}))
{
    /* Inovke your Root command handler here */
}

您必须保护事件处理程序不被垃圾收集器收集，请参阅this Answer。
PosixSignalRegistration是在.NET Core 6.0中引入的。
对于旧版本，AppDomain.CurrentDomain.ProcessExit可用，并在SIGTERM上引发，Console.CancelKeyPress在SIGINT上引发。
PosixSignalRegistration可以取消SIGTERM，这样您就可以在事件处理程序外 * 清理了。使用ProcessExit，您必须清理事件处理程序内部：

static void Main(string[] args)
{
    Console.WriteLine();
    Console.WriteLine($"Process ID = {Environment.ProcessId}");
    var cancel = false;
    Console.CancelKeyPress += new ConsoleCancelEventHandler((s, e) =>
    {
        Console.WriteLine($"CancelKeyPress");
        e.Cancel = true; // not terminate immediately
        cancel = true;
    });
    AppDomain.CurrentDomain.ProcessExit += new EventHandler((s, e) =>
    {
        Console.WriteLine($"ProcessExit");
        Console.WriteLine($"Process {Environment.ProcessId} exited gracefully (SIGTERM).");
    });
    do
    {
        Thread.Sleep(10);
    } while (!cancel);
    Console.WriteLine($"Process {Environment.ProcessId} exited gracefully (SIGINT).");
}

结果：

$ dotnet run &
Process ID = 4113
$ kill -s INT 4113
CancelKeyPress
Process 4113 exited gracefully (SIGINT).
$ dotnet run &
Process ID = 4395
$ kill -s TERM 4395
ProcessExit
Process 4395 exited gracefully (SIGTERM).