初始化

WebApplication2/services/MQServices.cs

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+
+using Confluent.Kafka;
+
+namespace WebApplication2.services
+{
+    public class MQServices : BackgroundService
+    {
+        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+        {
+            var conf = new ConsumerConfig
+            {
+                GroupId = "test-consumer-group",
+                BootstrapServers = "localhost:9092",
+                // Note: The AutoOffsetReset property determines the start offset in the event
+                // there are not yet any committed offsets for the consumer group for the
+                // topic/partitions of interest. By default, offsets are committed
+                // automatically, so in this example, consumption will only start from the
+                // earliest message in the topic 'my-topic' the first time you run the program.
+                AutoOffsetReset = AutoOffsetReset.Earliest
+            };
+
+            using (var c = new ConsumerBuilder<string, string>(conf).Build())
+            {
+                c.Subscribe("test-topic");
+                try
+                {
+                    while (true)
+                    {
+                        try
+                        {
+                            var cr = c.Consume(stoppingToken);
+                            var v= cr.Message.Value;
+                            var k=cr.Message.Key;
+                            Console.WriteLine($"Consumed message '{k} {v}' at: '{cr.TopicPartitionOffset}'.");
+                        }
+                        catch (ConsumeException e)
+                        {
+                            Console.WriteLine($"Error occured: {e.Error.Reason}");
+                        }
+                    }
+                }
+                catch (OperationCanceledException)
+                {
+                    // Ensure the consumer leaves the group cleanly and final offsets are committed.
+                    c.Close();
+                }
+            }
+            await Task.CompletedTask;
+        }
+    }
+}