getting the grpc-for-wcf-developers-master, I tried to host the WCF service in the tradersys on IIS version 10 on Windows 10, which throws an exception:
Error by IIS
The AutofacServiceHost.Container static property must be set before services can be instantiated.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.InvalidOperationException: The AutofacServiceHost.Container static property must be set before services can be instantiated.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
I'm aware of this issue as discussed several times here, such as this post.
Yet the code by Microsft contains the appropriate autofac container.
the question is:
Is there any special settings on IIS for resolving this issue?
as I said earlier IISExpress just works fine.
seems the AppInitialize() method in which
AutofacHostFactory.Container = builder.Build();
resides, doesn't invoke.
Based on your code, I found that you need to integrate IOC with WCF, which needs to change your code.
Here is my demo:
This is my project directory.We need to add two classes: ManualProxy and CustomServiceHostFactory.
public class CustomServiceHostFactory : ServiceHostFactory
{
protected override System.ServiceModel.ServiceHost
CreateServiceHost(Type serviceType, Uri[] baseAddresses)
{
ManualProxy.TargetFactory = () => new PortfolioService(new PortfolioRepository());
return base.CreateServiceHost(typeof(ManualProxy), baseAddresses);
}
}
This is the CustomServiceHostFactory class.
public class ManualProxy : IPortfolioService
{
private readonly IPortfolioService _target;
public static Func<object> TargetFactory;
public ManualProxy()
{
_target = (IPortfolioService)TargetFactory();
}
public Task<Portfolio> Get(Guid traderId, int portfolioId)
{
return _target.Get(traderId,portfolioId);
}
public Task<List<Portfolio>> GetAll(Guid traderId)
{
return _target.GetAll(traderId);
}
}
This is the ManualProxy class.
The SVC file needs to be changed as above picture.
Related
I'm running into a problem running an ASP.NET Core 1.0 application targeting .NET Framework 4.6. The problem didn't occur until we tried to run the application on a server running Windows Server 2016. The app is hosted in IIS and I have the .NET Core 1.0 Windows Hosting Bundle installed on the server.
Upon loading the site a 500 error is returned and this is written to the Logs:
An unhandled exception has occurred: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information. (fc7986d0)
System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.
Researching this it appears to relate to a missing dll or mismatched version, and that I should look at the LoaderExceptions property to get more info, but I'm not sure how to do that in this instance. The log entry is created just from setting up the loggerFactory in the Configure() method of Startup.cs.
I tried adding an IExceptionFilter ActionFilter implementation and reading the LoaderExceptions property if the exception is of type ReflectionTypeLoadException, but it doesn't get hit when ran on the server.
Is there a way to drill down into the Exception to read the LoaderExceptions property (in a production environment, there is no error when running in Visual Studio so debugging didn't help), or else another way to troubleshoot the original error to determine what is wrong with the server setup?
Instead of using IExceptionFilter, I wrote my own Middleware for catching this sort of exception and was able to log each exception from the LoaderExceptions property and determine what my problem is. Here is what I added to log the LoaderExceptions:
public class ExceptionCatchMiddleware
{
private readonly RequestDelegate _delegate;
private readonly ILogger _logger;
public ExceptionCatchMiddleware(RequestDelegate requestDelegate, ILogger<ExceptionCatchMiddleware> logger)
{
_delegate = requestDelegate;
_logger = logger;
}
public async Task Invoke(HttpContext context)
{
try
{
await _delegate(context);
}
catch (ReflectionTypeLoadException e)
{
foreach (Exception ex in e.LoaderExceptions)
{
_logger.LogCritical(ex.Message + Environment.NewLine + ex.StackTrace);
}
}
}
}
And then I just needed to add the Middleware to the Configure() method in Startup.cs:
app.UseMiddleware<ExceptionCatchMiddleware>();
In my case it was a missing dll that wasn't included in the project but since it was in my dev machine's GAC it ran there just fine.
I'm a newbie on the subject, so I'll try to make this as clear as I can...
I created a WcfModule, where I load the following package:
Bind<IDistributorService>().To<DistributorService>().InRequestScope().Intercept().With<ExceptionInterceptor>();
At first, I don't receive any error, but I put an InterceptAttribute on my function:
[AttributeUsage(AttributeTargets.Method)]
public sealed class HandleExceptionsAttribute : InterceptAttribute
{
public override IInterceptor CreateInterceptor(IProxyRequest request)
{
return request.Kernel.Get<ExceptionInterceptor>();
}
}
[HandleExceptions]
public virtual Result<List<DistributorDataContract>> GetDistributor(string id)
{
//...code...
I get an error in this function: (first line in method)
private ServiceHost CreateNewServiceHost(Type serviceType, Uri[] baseAddresses, WebHttpBehavior webBehavior, WebHttpBinding webHttpBinding)
{
var host = base.CreateServiceHost(serviceType, baseAddresses);
//...
}
With the error:
InvalidProxyConstructorArgumentsException was unhandled by user code
Can not instantiate proxy of class:
My.Namespace.DistributorService.
Could not find a parameterless constructor.
Anyone who knows what the problem could be? Thanks!
This exception is thrown by castle core dynamic proxy when it is instructed to create a "class proxy" which does not have a parameterless (default) constructor and no constructor-arguments are passed to castle (see source).
My best guess is, that when you use ninject interception by attributes, ninject will instruct castle core to create a class-proxy, no matter whether your binding is Bind<IFoo>().To<Foo>() or Bind<Foo>().ToSelf().
It seems a bit strange, however, that ninject is not resolving and passing along all required constructor parameters.
What is the implementation of DistributorService and what's the implementation of the base class of the class containing CreateNewServiceHost?
Workaround:
Of course, switching to the Intercept().With<TInterceptor>() syntax will probably also enable you to use interception (see http://codepyre.com/2010/03/using-ninject-extensions-interception-part-2-working-with-interceptors/)
I've been struggling with this problem for a whole day and do not know how to fix it. I have tried various things to resolve the issue but I am at a loss.
I have a project where I am attempting to use the LogReceiverServer from NLog to send and receive messages between 2 PCs. I followed this example here. Everything actually works fine, my WCF service starts up correctly, my client starts up correctly, even the sending of the message to log from client to server works. But, when I shut the client down, I get SocketExceptions thrown by the server for each message that was transmitted. I know this is due to the channel not being closed properly by the client. I cannot find where I must close the channel to prevent the exceptions being thrown by my server. I have read that to manually close the channel I must use
Channel.Close();
would that be correct and where would I put that?
I want to prevent these SocketExceptions. I have found this, but it does not seem to be the correct thing to do. Correct me if I am wrong, but would the solution not use the same principles?
Unless of course I am understanding this completely wrong...
Everything is done using the config files (App.Config and NLog.Config).
Here is my LogReceiverService Target from NLog.config:
<target xsi:type="LogReceiverService"
name="logreceiver"
endpointConfigurationName="LogReceiverClient"
endpointAddress="net.tcp://server:8888/NLogServices/LogReceiverServer/logreceiverserver" />
Here is my endpoint from my app.config:
<endpoint address="net.tcp://server:8888/NLogServices/LogReceiverServer/logreceiverserver"
binding="netTcpBinding"
bindingConfiguration="LogReceiverClient"
contract="NLog.LogReceiverService.ILogReceiverClient"
name="LogReceiverClient" />
Any help or advise would greatly be appreciated.
EDIT: Extended on problem description
OK, So first, here is the Service on my host pretty much as I got it from here:
/// <summary>
/// Log service server object that logs messages.
/// </summary>
[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall, ConcurrencyMode = ConcurrencyMode.Single)]
public class LogReceiverServer : ILogReceiverServer
{
public void ProcessLogMessages(NLogEvents nevents)
{
var events = nevents.ToEventInfo("Client.");
foreach (var ev in events)
{
var logger = LogManager.GetLogger(ev.LoggerName);
logger.Log(ev);
}
}
}
I then created this class, where I inherit from LogReceiverWebServiceTarget and override protected virtual WcfLogReceiverClient CreateWcfLogReceiverClient(); method. It is exactly the same as is found on GitHub here, except that I registered on the ProcessLogMessagesCompleted event where I close the 'client':
[Target("wcftarget")]
public class WcfTarget : LogReceiverWebServiceTarget
{
protected override WcfLogReceiverClient CreateWcfLogReceiverClient()
{
WcfLogReceiverClient client;
if (string.IsNullOrEmpty(EndpointConfigurationName))
{
// endpoint not specified - use BasicHttpBinding
Binding binding;
if (UseBinaryEncoding)
{
binding = new CustomBinding(new BinaryMessageEncodingBindingElement(), new HttpTransportBindingElement());
}
else
{
binding = new BasicHttpBinding();
}
client = new WcfLogReceiverClient(binding, new EndpointAddress(EndpointAddress));
}
else
{
client = new WcfLogReceiverClient(EndpointConfigurationName, new EndpointAddress(EndpointAddress));
/*commenting this out causes multiple socket exceptions on host*/
client.ProcessLogMessagesCompleted += client_ProcessLogMessagesCompleted;
}
return client;
}
private void client_ProcessLogMessagesCompleted(object sender, AsyncCompletedEventArgs e)
{
WcfLogReceiverClient client = sender as WcfLogReceiverClient;
if (client.State == CommunicationState.Opened)
{
(sender as WcfLogReceiverClient).Close();
}
}
}
The Logger in NLog.config is:
<logger name="*" writeTo="logreceiver" minlevel="Info" />
So then if I try to log like this:
class Program
{
private static NLog.Logger logger = NLog.LogManager.GetCurrentClassLogger();
private static void Main(string[] args)
{
logger.Info("foo");
}
}
my host gives prints this to Debug:
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in System.ServiceModel.dll
Will this have any impact on performance of the host over a long period of time?
The problem has been resolved: https://github.com/NLog/NLog/commit/138fd2ec5d94072a50037a42bc2b84b6910df641
I followed : this article and implemented it in a WCF Service.
It allows us to create a instance of a Service that doesn't have a parameterless constructor, by implementing a custom IServiceBehavior, and then decorating the service with that Service Behavior, so instead of having for example:
[ServiceBehavior]
public class MyService : IMyService
I would have
[InstanceProviderBehavior]
public class MyService : IMyService
I then implement the ApplyDispatchBehavior like this:
foreach (ChannelDispatcher cd in serviceHostBase.ChannelDispatchers) {
foreach (EndpointDispatcher ed in cd.Endpoints) {
if (!ed.IsSystemEndpoint) {
Console.WriteLine("Using InstanceProviderBehaviorAttribute");
ed.DispatchRuntime.InstanceProvider = new ServiceInstanceProvider(Configuration.Instance.Container);
}
}
}
And to provide an instance of the service I just do:
public object GetInstance(InstanceContext instanceContext, Message message)
{
AlertQueryService result = Container.Resolve<AlertQueryService>();
return result;
}
I ran it in windows and it worked as expected. But in linux with mono, it throws the exception
Exception Default constructor not found for type MyService
which indicates that maybe mono is ignoring the InstanceProviderBehaviorAttribute.
Another thing i noticed was that the line:
Console.WriteLine("Using InstanceProviderBehaviorAttribute");
Is executed in windows when the service host is opened. While in linux when the service host is opened, it doesn't write that in the console. Also the exception in linux is not thrown when we open the service host, but when the IsInitiating operation is called in MyService:
[OperationContract(IsInitiating = true)]
void Initialize();
Which indicates that with mono the service instance is only being resolved when we call the IsInitiating operation.
Any idea why this is works in windows and not in linux with mono? And why is the initialization behavior different?
Thanks
Try adding an InstanceContextProvider as well as your InstanceProvider in your EndpointBehavior. It seems the Mono implementation of ChannelDispatcher.ListenerLoopManager.Setup doesn't like the idea of being sans InstanceContextProvider if there is no parameterless constructor.
The InstanceContextProvider can be essentially a no-op implementation. So long as there is an instance, it will pass that check in ListenerLoopManagerSetup and happily proceed to utilize your InstanceProvider.
Re: why the different implementation... Mono is a re-implementation rather than a cross-compilation or even port. Consider the Important Rules section of their Contribution Guidelines. It wasn't until very recently that developers could contribute to the project if they had so much as looked at MS source code.
I installed Ninject via nuget, and I registered my binds in NinjectMVC3's RegisterServices method (created by nuget). Follow my code:
private static void RegisterServices(IKernel kernel)
{
kernel.Bind<IUnitOfWork>().To<UnitOfWork>();
kernel.Bind<IRepository<Action>>().To<ActionRepository>();
kernel.Bind<IRepository<ActionType>>().To<ActionTypeRepository>();
kernel.Bind<IRepository<City>>().To<CityRepository>();
kernel.Bind<IRepository<Country>>().To<CountryRepository>();
kernel.Bind<IRepository<Goods>>().To<GoodsRepository>();
kernel.Bind<IRepository<Media>>().To<MediaRepository>();
kernel.Bind<IRepository<MediaType>>().To<MediaTypeRepository>();
kernel.Bind<IRepository<Ranking>>().To<RankingRepository>();
kernel.Bind<IRepository<Role>>().To<RoleRepository>();
kernel.Bind<IRepository<Sponsor>>().To<SponsorRepository>();
kernel.Bind<IRepository<State>>().To<StateRepository>();
kernel.Bind<IRepository<UserAccountInfo>>().To<UserAccountInfoRepository>();
kernel.Bind<IRepository<UserAction>>().To<UserActionRepository>();
kernel.Bind<IRepository<UserDeservesGoods>>().To<UserDeservesGoodsRepository>();
kernel.Bind<IRepository<UserGoods>>().To<UserGoodsRepository>();
kernel.Bind<IRepository<User>>().To<UserRepository>();
kernel.Bind<IUserService>().To<UserService>();
kernel.Bind<IAccountService>().To<AccountService>();
DependencyResolver.SetResolver(new NinjectDependencyResolver(kernel));
}
here is my HomeController:
readonly IRepository<Ranking> repoRanking;
public HomeController(IRepository<Ranking> repoRanking)
{
this.repoRanking = repoRanking;
}
When I execute HomeController, I get follow exception:
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: Ninject.ActivationException: Error activating IRepository{Ranking}
No matching bindings are available, and the type is not self-bindable.
Activation path:
2) Injection of dependency IRepository{Ranking} into parameter repoRanking of constructor of type HomeController
1) Request for HomeController
Suggestions:
1) Ensure that you have defined a binding for IRepository{Ranking}.
2) If the binding was defined in a module, ensure that the module has been loaded into the kernel.
3) Ensure you have not accidentally created more than one kernel.
4) If you are using constructor arguments, ensure that the parameter name matches the constructors parameter name.
5) If you are using automatic module loading, ensure the search path and filters are correct.
What I doing wrong?
Have you created a default module where you set your bindings instead of in the register services method?
public class DefaultModule : NinjectModule {
public override void Load() {
Bind<IProductService>().To<ProductService>().InTransientScope();
}
}
and then in your Global.asax file do this:
protected override IKernel CreateKernel() {
var kernel = new StandardKernel();
kernel.Load(Assembly.GetExecutingAssembly());
return kernel;
}