如何在汇合kafka C＃中读取GenericRecord特定数据

Question

This is my simple code snippet which try to to read the Avro generic record form consumer:

using (var schemaRegistry = new CachedSchemaRegistryClient(new SchemaRegistryConfig { SchemaRegistryUrl = schemaRegistryUrl }))
  using (var consumer = new 
        ConsumerBuilder<string, GenericRecord>(new ConsumerConfig { BootstrapServers = bootstrapServers, GroupId = groupName })
                        .SetKeyDeserializer(new AsyncAvroDeserializer<string>(schemaRegistry).AsSyncOverAsync())
                        .SetValueDeserializer(new AsyncAvroDeserializer<GenericRecord>(schemaRegistry).AsSyncOverAsync())
                        .SetErrorHandler((_, e) => Console.WriteLine($"Error: {e.Reason}"))
                        .Build())
                {
      consumer.Subscribe(topicName);

      try
       {
           while (true)
             {
                try
                 {
                    var consumeResult = consumer.Consume();
                    Console.WriteLine($"Key: {consumeResult.Message.Key}\nValue: {consumeResult.Value}");
                    Console.WriteLine(consumeResult.Value.Schema);
                            Console.WriteLine(consumeResult.Value.Schema["favorite_number"]);

                  }
                 catch (ConsumeException e)
                   {
                       Console.WriteLine($"Consume error: {e.Error.Reason}");
                            }
                        }
                    }
                    catch (OperationCanceledException)
                    {
                        // commit final offsets and leave the group.
                        consumer.Close();
                    }
                }

As you can see i have can log the schema but dont know how to get its data value.

 Console.WriteLine(consumeResult.Value.Schema);

 Console.WriteLine(consumeResult.Value.Schema["favorite_number"]);

While the schema and data is like this in this object consumeResult.Value :

{Schema: {"type":"record","name":"User","namespace":"Confluent.Kafka.Examples.AvroSpecific","fields":[{"name":"name","type":"string"},{"name":"favorite_number","type":["int","null"]},{"name":"favorite_color","type":["string","null"]}]}, contents : { name: sfs, favorite_number: 41, favorite_color: blue, }}

I want to read content data.

Answer 1

the content is not accessible

I don't think Value.contents is what you want. Particularly because that property is private , as you mentioned

The getter is defined like a dictionary - Source code

Try consumeResult.Value["favorite_number"]

---

When you do consumeResult.Value.Schema["favorite_number"] , you get the Field object within the schema not the value of the field within the outer record. - Source code