asp.net核心依赖注入配置
问题描述:
我正在寻找注入一个卡夫卡生产者作为一个单身我的应用程序。目前在处理实例时需要两个步骤。首先,你必须刷新缓冲区,第二次调用处理。为了提高性能,只有在不再处理消息时才会发生这种情况。asp.net核心依赖注入配置
我对ASP.NET核心的解决方案是在DI中使用AddSingleton()
方法,然后使用ApplicationLifetime.ApplicationStopping.Register
来注册一个回调函数,以便刷新和处置生产者。我跟着在这里找到教程:https://andrewlock.net/four-ways-to-dispose-idisposables-in-asp-net-core/
组建一个快速测试我确实在我的启动类如下:
public void ConfigureServices(IServiceCollection services)
{
var producerConfig = new Dictionary<string, object>
{
{ "bootstrap.servers", "192.168.99.100:9092" },
{ "client.id", Dns.GetHostName() },
{ "api.version.request", true }
};
services.AddSingleton(new Producer<Null, string>(producerConfig, null, new StringSerializer(Encoding.UTF8)));
services.AddMvc();
}
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory, IApplicationLifetime lifetime)
{
loggerFactory.AddConsole();
app.UseMvc();
app.UseWebSockets();
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
lifetime.ApplicationStopping.Register(flushAndDispose, app.ApplicationServices.GetRequiredService<Producer>());
}
,但是当它运行我得到以下错误:
An exception of type 'System.InvalidOperationException' occurred in Microsoft.Extensions.DependencyInjection.Abstractions.dll but was not handled in user code: 'No service for type 'Confluent.Kafka.Producer' has been registered.'
答
假设也是Producer<T1,T2>
衍生自Producer
您没有明确注册Producer
与服务集合,因此提供程序不知道如何解决它。
services.AddSingleton<Producer>(
c => new Producer<Null, string>(producerConfig, null,
new StringSerializer(Encoding.UTF8)));