Question

我们有Windows服务，该服务托管Web api并在后台执行一些计算工作。我们有时会收到例外情况：

2019-12-27 11:49:15.525 +01:00 [Error] [Serilog.Log.Write] Unhandled exception caught. Runtime is terminating : True
System.ObjectDisposedException: Cannot access a disposed object.
Object name: 'IServiceProvider'.
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.ThrowHelper.ThrowObjectDisposedException()
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope.GetService(Type serviceType)
   at MediatR.ServiceFactoryExtensions.GetInstances[T](ServiceFactory factory)
   at MediatR.Internal.RequestHandlerWrapperImpl`2.Handle(IRequest`1 request, CancellationToken cancellationToken, ServiceFactory serviceFactory)
   at MediatR.Mediator.Send[TResponse](IRequest`1 request, CancellationToken cancellationToken)
   at DataProcessor.Enricher.ChangeTracking.LegacyDataChangeTracker.SendForEnrichment(TurbineTimeCounters turbineTimeCounters, Unit unit)
   at DataProcessor.Enricher.ChangeTracking.LegacyDataChangeTracker.<ProcessEventsAndHistData>b__29_1(Unit unit)
   at System.Threading.Tasks.Task.<>c.<ThrowAsync>b__139_1(Object state)
   at System.Threading.QueueUserWorkItemCallbackDefaultContext.Execute()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()

启动时，我们没有内置DI的任何例外，因此依赖项已正确配置。

我进行了调查。 MediatR的ServiceFactory是Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope.GetService的委托方法。

ServiceProviderEngineScope在MediatR调用时被处理。 https://github.com/aspnet/DependencyInjection/blob/master/src/DI/ServiceLookup/ServiceProviderEngineScope.cs

在MediatR调用ServiceProviderEngineScope之前为何要处置它的任何想法？

MediatR 版本7.0.0。

Asp.Net核心 3.0。

ASP.NET Core 3.0-无法访问已处置的对象。对象名称：“ IServiceProvider”

0 个答案: