我有一个配置如下的消费者
.ConfigureServices((hostContext, services) =>
{
services.AddMassTransit(cfg =>
{
cfg.AddConsumer <Consumers>();
cfg.UsingRabbitMq((context, cfgss) =>
{
cfgss.Host(new Uri("rabbitmq://localhost/"), hostss =>
{
hostss.Username("guest");
hostss.Password("guest");
});
cfgss.ReceiveEndpoint("Queue_Name", configureEndpoint =>
{
//configureEndpoint.ConfigureConsumer<Consumers>(context);
configureEndpoint.Consumer<Consumers>();
});
cfgss.ConfigureEndpoints(context);
});
});
})
服务是在 ContainerBuilder 上使用 Autofac 创建的,EventService 是应该注入到消费者中的服务
var host = new HostBuilder()
.UseServiceProviderFactory(new AutofacServiceProviderFactory())
.ConfigureHostConfiguration(configHost => { configHost.SetBasePath(Directory.GetCurrentDirectory()); })
.ConfigureAppConfiguration((hostContext, configApp) =>
{
configApp.AddJsonFile("appsettings.json", optional: false);
})
.ConfigureContainer<ContainerBuilder>(builder =>
{
builder.RegisterType<EventService>().As<IService>();
}
这就是消费者
public Consumers() { }
public Consumers(IService EventService)
{
_eventsService = EventService;
}
public Task Consume(ConsumeContext<Msg> context)
{
_eventsService.ProcessInternal(context.Message);
return Task.CompletedTask;
}
每当收到消息时,都会调用空构造函数,但 _eventsService 为 null
您应该使用
ConfigureConsumer
:
cfgss.ReceiveEndpoint("Queue_Name", configureEndpoint =>
{
configureEndpoint.ConfigureConsumer<Consumers>(context);
});
并完全删除空构造函数。