Asp.net core Kafka-在ASP.Net核心中实例化生产者类时出错

我使用的是合流的卡夫卡

string kafkaEndpoint = "127.0.0.1:9092";

        string kafkaTopic = "testtopic";

        var producerConfig = new Dictionary<string, object> { { "bootstrap.servers", kafkaEndpoint } };

        using (var producer = new Producer<Null, string>(producerConfig, null, new StringSerializer(Encoding.UTF8)))
        {
            // Send 10 messages to the topic
            for (int i = 0; i < 10; i++)
            {
                var message = $"Event {i}";
                var result = producer.ProduceAsync(kafkaTopic, null, message).GetAwaiter().GetResult();
                Console.WriteLine($"Event {i} sent on Partition: {result.Partition} with Offset: {result.Offset}");
            }
        }

显示错误：

Cannot convert from 'Confluent.Kafka.Message<Confluent.Kafka.Null, MyClass>' to 'Confluent.Kafka.Message<Confluent.Kafka.Null, string>

无法从“Confluent.Kafka.Message”转换为“Confluent.Kafka.Message”

在

Confluent.Kafka

nuget v1.0.1中，

Producer

类是一个内部类，即它是不可访问的。看起来您需要改用

ProducerBuilder

，例如：

var producerConfig = new Dictionary<string, string> { { "bootstrap.servers", kafkaEndpoint } };

using (var producer = new ProducerBuilder<Null, string>(producerConfig)
    .SetKeySerializer(Serializers.Null)
    .SetValueSerializer(Serializers.Utf8)
    .Build())
{
    // Send 10 messages to the topic
    for (int i = 0; i < 10; i++)
    {
        var message = $"Event {i}";
        var result = producer.ProduceAsync(kafkaTopic, new Message<Null, string>{ Value = message}).GetAwaiter().GetResult();
        Console.WriteLine($"Event {i} sent on Partition: {result.Partition} with Offset: {result.Offset}");
    }
}

---

对我注意到这个班在内部。我是否需要使用其他软件包来使用它，因为在我遵循的所有文档中，他们使用的是Producer类看起来不需要额外的NUGET，只需要

Confluent.Kafka

。我已经更新了我的答案，ProducerBuilder要求

producerConfig

成为

Dictionary

谢谢@Renat。我试图使用

Producer

类，因为我想发送类的实例，而不是消息，如何使用

ProducerBuilder

传递对象？我第一次尝试卡夫卡，我没有idea@AdritaSharma，看起来将消息类型从

string

更改为自定义类型会起作用：

producer.ProduceAsync（kafkaTopic，新消息{Value=myObject}）..

var producerConfig = new Dictionary<string, string> { { "bootstrap.servers", kafkaEndpoint } };

using (var producer = new ProducerBuilder<Null, string>(producerConfig)
    .SetKeySerializer(Serializers.Null)
    .SetValueSerializer(Serializers.Utf8)
    .Build())
{
    // Send 10 messages to the topic
    for (int i = 0; i < 10; i++)
    {
        var message = $"Event {i}";
        var result = producer.ProduceAsync(kafkaTopic, new Message<Null, string>{ Value = message}).GetAwaiter().GetResult();
        Console.WriteLine($"Event {i} sent on Partition: {result.Partition} with Offset: {result.Offset}");
    }
}

        var result = producer.ProduceAsync(kafkaTopic, new Message<Null, MyClass>{ Value = myObject}).GetAwaiter().GetResult();