創建NServiceBus總線時出現「對象引用未設置」錯誤

我在創建總線時遇到問題。當我從傳遞給With（）函數的集合中刪除最後一個程序集（「MyAssembly.LetterProcessor」）時，它在本節中不會中斷，儘管它稍後會中斷。該錯誤消息僅爲「未將對象引用設置爲對象的實例」。沒有內在的例外。創建NServiceBus總線時出現「對象引用未設置」錯誤

我在使用NSB 3.2.0.0。

NServiceBus.SetLoggingLibrary.Log4Net(log4net.Config.XmlConfigurator.Configure); 

    var assemblies = new List<Assembly> { Assembly.Load("NServiceBus"), Assembly.Load("NServiceBus.Core"), Assembly.Load("MyAssembly.LetterProcessor") }; 
    var cfg = NServiceBus.Configure.With(assemblies); 

    cfg = cfg.DefineEndpointName("MyAssembly.letterprocessor"); 
    cfg = cfg.DefaultBuilder(); 
    cfg = cfg.DefiningMessagesAs(t => t.Namespace != null && 
             (
              t.Namespace.Equals("MyAssembly.LetterProcessor.NSB.BatchSaga") 
              || t.Namespace.Equals("MyAssembly.LetterProcessor.NSB.FileSaga") 
            ) 
     ); 
    cfg = cfg.MessageForwardingInCaseOfFault(); 
    cfg = cfg.Log4Net(); 
    cfg = cfg.StructureMapBuilder(); 
    cfg = cfg.XmlSerializer(); 
    cfg = cfg.MsmqTransport(); 
    cfg = cfg.IsTransactional(true); 
    cfg = cfg.IsolationLevel(System.Transactions.IsolationLevel.Serializable); 
    cfg = cfg.Sagas(); 
    cfg = cfg.NHibernateSagaPersister(); 
    var cfgu = cfg.UnicastBus(); 
    cfgu = cfgu.LoadMessageHandlers(); 
    var sb = cfgu.CreateBus(); // <-- breaks here. 
    var bus = sb.Start();

...和堆棧跟蹤：

at System.Reflection.Emit.CustomAttributeBuilder.EmitValue(BinaryWriter writer, Type type, Object value) 
    at System.Reflection.Emit.CustomAttributeBuilder.InitCustomAttributeBuilder(ConstructorInfo con, Object[] constructorArgs, PropertyInfo[] namedProperties, Object[] propertyValues, FieldInfo[] namedFields, Object[] fieldValues) 
    at System.Reflection.Emit.CustomAttributeBuilder..ctor(ConstructorInfo con, Object[] constructorArgs, PropertyInfo[] namedProperties, Object[] propertyValues) 
    at NServiceBus.MessageInterfaces.MessageMapper.Reflection.MessageMapper.BuildCustomAttribute(Object customAttribute) 
    at NServiceBus.MessageInterfaces.MessageMapper.Reflection.MessageMapper.AddCustomAttributeToProperty(Object customAttribute, PropertyBuilder propBuilder) 
    at NServiceBus.MessageInterfaces.MessageMapper.Reflection.MessageMapper.CreateTypeFrom(Type t, ModuleBuilder moduleBuilder) 
    at NServiceBus.MessageInterfaces.MessageMapper.Reflection.MessageMapper.GenerateImplementationFor(Type interfaceType, ModuleBuilder moduleBuilder) 
    at NServiceBus.MessageInterfaces.MessageMapper.Reflection.MessageMapper.InitType(Type t, ModuleBuilder moduleBuilder) 
    at NServiceBus.MessageInterfaces.MessageMapper.Reflection.MessageMapper.InitType(Type t, ModuleBuilder moduleBuilder) 
    at NServiceBus.MessageInterfaces.MessageMapper.Reflection.MessageMapper.InitType(Type t, ModuleBuilder moduleBuilder) 
    at NServiceBus.MessageInterfaces.MessageMapper.Reflection.MessageMapper.Initialize(IEnumerable`1 types) 
    at NServiceBus.Serializers.XML.Config.MessageTypesInitializer.Run() 
    at NServiceBus.Configure.<Initialize>b__d(IWantToRunWhenConfigurationIsComplete o) 
    at System.Collections.Generic.List`1.ForEach(Action`1 action) 
    at NServiceBus.Configure.Initialize() 
    at NServiceBus.Configure.CreateBus() 
    at MyAssembly.LetterProcessor.Service.Tests.Tests.EndpointInit() in C:\svn\MyAssembly\LetterProcessor\trunk\src\MyAssembly.LetterProcessor.Service.Tests\Tests.cs:line 72>

來源

2012-11-05 Malcolm L

撥號您的端點DEBUG的日誌記錄級別，以便您可以看到哪些消息類型，它正在對當它炸燬了。 –

你有任何消息的[obsolete]屬性（或任何其他屬性）嗎？ https://github.com/NServiceBus/NServiceBus/issues/353 –

的問題已被發現。這是由於我在IMessage實現的相同名稱空間內混合了Handler類。可以有兩種解決方案：（1）我可以將消息和處理程序分離到不同的名稱空間/程序集中，或者（2）我可以通過IMessage指定DefiningMessagesAs函數過濾器。

第二個方案是這樣的：

var bus = NServiceBus.Configure.With(assemblies) 
     .DefineEndpointName("myApp.letterprocessor") 
     .DefiningMessagesAs(t => t.GetType().GetInterfaces().Contains(typeof(IMessage))) // <-- fixes my problem 
     ... etc

來源

2012-11-06 16:13:08

創建NServiceBus總線時出現「對象引用未設置」錯誤

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