使用C#向生产者发送消息时，如何在kafka消息中添加头部属性？

using Confluent.Kafka;
using System;

class Program
{
    static void Main(string[] args)
    {
        var config = new ProducerConfig
        {
            BootstrapServers = "your-bootstrap-servers"
        };

        using (var producer = new ProducerBuilder<Null, string>(config).Build())
        {
            var headers = new Headers();
            headers.Add("header-key", Encoding.UTF8.GetBytes("header-value"));

            var message = new Message<Null, string>
            {
                Headers = headers,
                Value = "your-message"
            };

            producer.ProduceAsync("your-topic", message)
                .ContinueWith(task =>
                {
                    if (task.IsFaulted)
                    {
                        Console.WriteLine($"Error: {task.Exception.Message}");
                    }
                    else
                    {
                        Console.WriteLine($"Message sent (partition: {task.Result.Partition}, offset: {task.Result.Offset})");
                    }
                });

            producer.Flush(TimeSpan.FromSeconds(10));
        }
    }
}