Redis keyspace notifications

Program.cs

using StackExchange.Redis;

var configurationOptions = new ConfigurationOptions
{
    EndPoints =
    {
        "localhost:6379"
    }
};

var connectionMultiplexer = await ConnectionMultiplexer.ConnectAsync(configurationOptions);
var subscriber = connectionMultiplexer.GetSubscriber();

await subscriber.SubscribeAsync("__keyspace@0__:*", (channel, type) =>
{
    var key = GetKey(channel);

    switch (type)
    {
        case "set":
            Console.WriteLine($"Set: {key}");
            break;
        case "expire":
            Console.WriteLine($"Expire: {key}");
            break;
        case "expired":
            Console.WriteLine($"Expired: {key}");
            break;
    }
});

Console.ReadLine();

await subscriber.UnsubscribeAllAsync();
await connectionMultiplexer.DisposeAsync();

static string GetKey(string channel)
{
    var index = channel.IndexOf(':');

    if (index >= 0 && index < channel.Length - 1)
    {
        return channel[(index + 1)..];
    }

    return channel;
}