PowerToys/src/modules/cmdpal/extensions/MediaControlsExtension/Program.cs

// Copyright (c) Microsoft Corporation
// The Microsoft Corporation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System;
using System.Threading;
using Microsoft.Windows.CommandPalette.Extensions;

namespace MediaControlsExtension;

public class Program
{
    [MTAThread]
    public static void Main(string[] args)
    {
        if (args.Length > 0 && args[0] == "-RegisterProcessAsComServer")
        {
            using ExtensionServer server = new();
            var extensionDisposedEvent = new ManualResetEvent(false);
            var extensionInstance = new SampleExtension(extensionDisposedEvent);

            // We are instantiating an extension instance once above, and returning it every time the callback in RegisterExtension below is called.
            // This makes sure that only one instance of SampleExtension is alive, which is returned every time the host asks for the IExtension object.
            // If you want to instantiate a new instance each time the host asks, create the new instance inside the delegate.
            server.RegisterExtension(() => extensionInstance);

            // This will make the main thread wait until the event is signalled by the extension class.
            // Since we have single instance of the extension object, we exit as sooon as it is disposed.
            extensionDisposedEvent.WaitOne();
        }
        else
        {
            Console.WriteLine("Not being launched as a Extension... exiting.");
        }
    }
}