Duplicate type name within an assembly in Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware

问题

I have .NET Core 1.1 API and i am handling the error in startup.cs as below. I am using Serilog

        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory, IApplicationLifetime appLifetime, IRequestContext requestContext)
        {      
           loggerFactory.AddSerilog();

           // Ensure any buffered events are sent at shutdown
            appLifetime.ApplicationStopped.Register(Log.CloseAndFlush);                

            var logger = loggerFactory.CreateLogger<Startup>();

            app.UseExceptionHandler(
                options =>
                {
                    options.Run(
                        async context =>
                        {
                            context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
                            var ex = context.Features.Get<IExceptionHandlerFeature>();
                            if (ex != null)
                            {
                                var errmsg = "An unexpected error has occured in API.";
                                var logDetails = new
                                {
                                    CorrelationId = requestContext.CorrelationId,
                                    Message = errmsg
                                };
                                logger.LogError(1001, ex.Error, "{@LogDetails}", logDetails);
                                await context.Response.WriteAsync(errmsg).ConfigureAwait(false);
                            }
                        });
                });

            app.UseMvc();

            logger.LogInformation("Application has started in environment {0}", env.EnvironmentName);
        }

Most of the time when there is any exception, Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware logs the exception as expected however, sometimes i see the following exception in the logs

2018-09-21 18:36:01.670 +00:00 [Error] An unhandled exception has occurred: Duplicate type name within an assembly.
System.ArgumentException: Duplicate type name within an assembly.
at System.Reflection.Emit.ModuleBuilder.CheckTypeNameConflict(String strTypeName, Type enclosingType) at System.Reflection.Emit.AssemblyBuilderData.CheckTypeNameConflict(String strTypeName, TypeBuilder enclosingType) at System.Reflection.Emit.TypeBuilder.Init(String fullname, TypeAttributes attr, Type parent, Type[] interfaces, ModuleBuilder module, PackingSize iPackingSize, Int32 iTypeSize, TypeBuilder enclosingType) at System.Reflection.Emit.ModuleBuilder.DefineType(String name, TypeAttributes attr, Type parent, Type[] interfaces) at Microsoft.Extensions.DiagnosticAdapter.Internal.ProxyAssembly.DefineType(String name, TypeAttributes attributes, Type baseType, Type[] interfaces)
at Microsoft.Extensions.DiagnosticAdapter.Internal.ProxyTypeEmitter.GenerateProxyTypeFromProperties(Type sourceType, Type targetType, VerificationResult verificationResult)
at Microsoft.Extensions.DiagnosticAdapter.Internal.ProxyTypeEmitter.VerifyProxySupport(ProxyBuilderContext context, Tuple2 key) at Microsoft.Extensions.DiagnosticAdapter.Internal.ProxyTypeEmitter.GetProxyType(ProxyTypeCache cache, Type targetType, Type sourceType) at Microsoft.Extensions.DiagnosticAdapter.Internal.ProxyFactory.CreateProxy[TProxy](Object obj) at Proxy_Method_From_<>f__AnonymousType03_To_Void OnBeforeAction(Microsoft.AspNetCore.Http.HttpContext, IRouteData)(Object , Object , IProxyFactory ) at Microsoft.Extensions.DiagnosticAdapter.DiagnosticSourceAdapter.Write(String diagnosticName, Object parameters) at Microsoft.Extensions.DiagnosticAdapter.DiagnosticSourceAdapter.System.IObserver>.OnNext(KeyValuePair`2 value) at System.Diagnostics.DiagnosticListener.Write(String name, Object value) at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.d__20.MoveNext()

--- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.AspNetCore.Builder.RouterMiddleware.d__4.MoveNext()

--- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware.d__6.MoveNext()

So looks like Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware its selft throwing exception while logging

Update 1

I have the following references. Not sure which reference is causing this issue. Microsoft.ApplicationInsights.AspNetCore is 2.0 however the only options available for this package are 1.0.* or 2.*.*. I don't see this package has 1.1.* available

来源：https://stackoverflow.com/questions/52450695/duplicate-type-name-within-an-assembly-in-microsoft-aspnetcore-diagnostics-excep