我确信之前已经出现，但经过我所有的搜索后，我找不到解决方案。
使用Unity的MVC5应用程序，我已经配置了一个简单的UnitOfWork，其中注入了DbContext并集成了OWIN（http://tech.trailmax.info/2014/09/aspnet-identity-and-ioc-container-registration/）一切运行良好。
我刚刚添加了Hangfire，并希望将我的DbContext注入后台任务，类似于UnitOfWork类，看起来很简单。
通过其界面支持任务，安装了hangfire，并且根据我使用Autofac和Autofac.Mvc5看到的样本。第一次剪切我用一个空的构造函数运行它都工作正常。现在将DbContext添加到构造函数中并删除空构造函数并敲击...
每次HangFire触发任务时，我都会在＆＃34;状态＆＃34;中获得以下异常。 HangFire表：
@ApiOperation(value = "export",
notes = "Export Report as a CSV")
@ApiResponses(value = {
@ApiResponse(code = 400, message = "Bad Request"),
@ApiResponse(code = 404, message = "Not Found"),
@ApiResponse(code = 500, message = "Internal Server Error") })
@RequestMapping(method = RequestMethod.POST, value = "/export", produces = "text/csv")
public ResponseEntity export( @RequestBody SearchCriteria criteria )
{
SimpleDateFormat sdf = new SimpleDateFormat( "yyyyMMddHHmm" );
SAStatsManager saStatsManager = new SAStatsManager();
InputStreamResource inputStreamResource;
InputStream inputStream;
byte[] byteArray = new byte[0];
HttpHeaders httpHeaders = new HttpHeaders();
try
{
inputStreamResource = saStatsManager.export( criteria );
if ( inputStreamResource == null )
{
return new ResponseEntity( "Error in exporting report!!! ", HttpStatus.INTERNAL_SERVER_ERROR );
}
httpHeaders.set( HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=" + REPORT_NAME + criteria.getProductCombination() + "_" + sdf.format( new Date() ) + ".csv" );
//convert inputStream to bytes
inputStream = inputStreamResource.getInputStream();
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
int nRead;
byte[] data = new byte[1024];
while ( ( nRead = inputStream.read( data, 0, data.length ) ) != -1 )
{
buffer.write( data, 0, nRead );
}
buffer.flush();
byteArray = buffer.toByteArray();
httpHeaders.setContentLength( byteArray.length );
return new ResponseEntity( byteArray, httpHeaders, HttpStatus.OK );
}
catch ( IOException e )
{
e.printStackTrace();
return new ResponseEntity( e.getMessage(), HttpStatus.INTERNAL_SERVER_ERROR );
}
}
我的配置如下：
UnityConfig.cs
{"FailedAt":"2017-06-20T03:48:25.4862236Z","ExceptionType":"Autofac.Core.DependencyResolutionException","ExceptionMessage":"An error occurred during the activation of a particular registration. See the inner exception for details. Registration: Activator = EmailProcess (ReflectionActivator), Services = [[AppName].Tasks.EmailProcess], Lifetime = Autofac.Core.Lifetime.CurrentScopeLifetime, Sharing = None, Ownership = OwnedByLifetimeScope ---> None of the constructors found with 'Autofac.Core.Activators.Reflection.DefaultConstructorFinder' on type '[AppName].Tasks.EmailProcess' can be invoked with the available services and parameters:
Cannot resolve parameter 'System.Data.Entity.DbContext db' of constructor 'Void .ctor(System.Data.Entity.DbContext)'. (See inner exception for details.)","ExceptionDetails":"Autofac.Core.DependencyResolutionException: An error occurred during the activation of a particular registration. See the inner exception for details. Registration: Activator = EmailProcess (ReflectionActivator), Services = [[AppName].Tasks.EmailProcess], Lifetime = Autofac.Core.Lifetime.CurrentScopeLifetime, Sharing = None, Ownership = OwnedByLifetimeScope ---> None of the constructors found with 'Autofac.Core.Activators.Reflection.DefaultConstructorFinder' on type '[AppName].Tasks.EmailProcess' can be invoked with the available services and parameters:
Cannot resolve parameter 'System.Data.Entity.DbContext db' of constructor 'Void .ctor(System.Data.Entity.DbContext)'. (See inner exception for details.) ---> Autofac.Core.DependencyResolutionException: None of the constructors found with 'Autofac.Core.Activators.Reflection.DefaultConstructorFinder' on type '[AppName].Tasks.EmailProcess' can be invoked with the available services and parameters:
Cannot resolve parameter 'System.Data.Entity.DbContext db' of constructor 'Void .ctor(System.Data.Entity.DbContext)'.
at Autofac.Core.Activators.Reflection.ReflectionActivator.GetValidConstructorBindings(IComponentContext context, IEnumerable`1 parameters)
at Autofac.Core.Activators.Reflection.ReflectionActivator.ActivateInstance(IComponentContext context, IEnumerable`1 parameters)
at Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable`1 parameters)
--- End of inner exception stack trace ---
at Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable`1 parameters)
at Autofac.Core.Resolving.InstanceLookup.Execute()
at Autofac.Core.Resolving.ResolveOperation.GetOrCreateInstance(ISharingLifetimeScope currentOperationScope, IComponentRegistration registration, IEnumerable`1 parameters)
at Autofac.Core.Resolving.ResolveOperation.Execute(IComponentRegistration registration, IEnumerable`1 parameters)
at Autofac.Core.Lifetime.LifetimeScope.ResolveComponent(IComponentRegistration registration, IEnumerable`1 parameters)
at Autofac.ResolutionExtensions.TryResolveService(IComponentContext context, Service service, IEnumerable`1 parameters, Object& instance)
at Autofac.ResolutionExtensions.ResolveService(IComponentContext context, Service service, IEnumerable`1 parameters)
at Autofac.ResolutionExtensions.Resolve(IComponentContext context, Type serviceType)
at Hangfire.AutofacJobActivator.AutofacScope.Resolve(Type type)
at Hangfire.Server.CoreBackgroundJobPerformer.Perform(PerformContext context)
at Hangfire.Server.BackgroundJobPerformer.<>c__DisplayClass8_0.<PerformJobWithFilters>b__0()
at Hangfire.Server.BackgroundJobPerformer.InvokePerformFilter(IServerFilter filter, PerformingContext preContext, Func`1 continuation)
at Hangfire.Server.BackgroundJobPerformer.<>c__DisplayClass8_1.<PerformJobWithFilters>b__2()
at Hangfire.Server.BackgroundJobPerformer.PerformJobWithFilters(PerformContext context, IEnumerable`1 filters)
at Hangfire.Server.BackgroundJobPerformer.Perform(PerformContext context)
at Hangfire.Server.Worker.PerformJob(BackgroundProcessContext context, IStorageConnection connection, String jobId)"}
Startup.cs
public class UnityConfig
{
#region Unity Container
private static Lazy<IUnityContainer> container = new Lazy<IUnityContainer>(() =>
{
var container = new UnityContainer();
RegisterTypes(container);
return container;
});
public static IUnityContainer GetConfiguredContainer()
{
return container.Value;
}
#endregion
public static void RegisterTypes(IUnityContainer container)
{
container.RegisterType<DbContext, ApplicationDbContext>(new PerRequestLifetimeManager());
container.RegisterType<ApplicationSignInManager>();
container.RegisterType<ApplicationUserManager>();
container.RegisterType<IAuthenticationManager>(new InjectionFactory(c => HttpContext.Current.GetOwinContext().Authentication));
container.RegisterType<IUserStore<ApplicationUser>, UserStore<ApplicationUser>>(new InjectionConstructor(typeof(ApplicationDbContext)));
container.RegisterType<IUnitOfWork, UnitOfWork>(new PerRequestLifetimeManager());
}
后台任务
public partial class Startup
{
public void Configuration(IAppBuilder app)
{
ConfigureAuth(app);
GlobalConfiguration.Configuration.UseSqlServerStorage("TaskEngine");
var builder = new ContainerBuilder();
builder.RegisterType<EmailProcess>();
GlobalConfiguration.Configuration.UseAutofacActivator(builder.Build());
app.UseHangfireDashboard();
app.UseHangfireServer();
// point task engine toi email processing
IEmailProcess emailProcess = DependencyResolver.Current.GetService<EmailProcess>();
RecurringJob.AddOrUpdate(() => emailProcess.ProcessEmailQueue(), Cron.MinuteInterval(1));
}
}
对于如何解决这个问题的任何想法都将非常感激。