fixed issue #45

src/DotNetCore.CAP/Internal/ConsumerInvokerFactory.cs

 using System;
 using DotNetCore.CAP.Abstractions;
-using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 
 namespace DotNetCore.CAP.Internal
@@ -23,15 +22,13 @@ namespace DotNetCore.CAP.Internal
 
         public IConsumerInvoker CreateInvoker(ConsumerContext consumerContext)
         {
-            using (var scope = _serviceProvider.CreateScope())
+            var context = new ConsumerInvokerContext(consumerContext)
             {
-                var context = new ConsumerInvokerContext(consumerContext)
-                {
-                    Result = new DefaultConsumerInvoker(_logger, scope.ServiceProvider, _modelBinderFactory, consumerContext)
-                };
+                Result = new DefaultConsumerInvoker(_logger, _serviceProvider,
+                        _modelBinderFactory, consumerContext)
+            };
 
-                return context.Result;
-            }
+            return context.Result;
         }
     }
 }
\ No newline at end of file

src/DotNetCore.CAP/Internal/IConsumerInvoker.Default.cs

@@ -35,25 +35,29 @@ namespace DotNetCore.CAP.Internal
         {
             _logger.LogDebug("Executing consumer Topic: {0}", _consumerContext.ConsumerDescriptor.MethodInfo.Name);
 
-            var obj = ActivatorUtilities.GetServiceOrCreateInstance(_serviceProvider,
-                    _consumerContext.ConsumerDescriptor.ImplTypeInfo.AsType());
+            using (var scope = _serviceProvider.CreateScope())
+            {
+                var provider = scope.ServiceProvider;
+                var serviceType = _consumerContext.ConsumerDescriptor.ImplTypeInfo.AsType();
+                var obj = ActivatorUtilities.GetServiceOrCreateInstance(provider, serviceType);
 
-            var jsonConent = _consumerContext.DeliverMessage.Content;
-            var message = Helper.FromJson<Message>(jsonConent);
+                var jsonConent = _consumerContext.DeliverMessage.Content;
+                var message = Helper.FromJson<Message>(jsonConent);
 
-            object result = null;
-            if (_executor.MethodParameters.Length > 0)
-            {
-                result = await ExecuteWithParameterAsync(obj, message.Content.ToString());
-            }
-            else
-            {
-                result = await ExecuteAsync(obj);
-            }
+                object result = null;
+                if (_executor.MethodParameters.Length > 0)
+                {
+                    result = await ExecuteWithParameterAsync(obj, message.Content.ToString());
+                }
+                else
+                {
+                    result = await ExecuteAsync(obj);
+                }
 
-            if (!string.IsNullOrEmpty(message.CallbackName))
-            {
-                await SentCallbackMessage(message.Id, message.CallbackName, result);
+                if (!string.IsNullOrEmpty(message.CallbackName))
+                {
+                    await SentCallbackMessage(message.Id, message.CallbackName, result);
+                }
             }
         }