[英]Exception while creating NServiceBus with CustomConfigurationSource
我需要使用CustomConfigurationSource創建NServiceBus來替換我的app.config。
我已經在代碼中實現了CustomConfiguration源,但是在創建總線時出現以下異常:
未處理System.NullReferenceException HResult = -2147467261 Message =對象引用未設置為對象的實例。 Source = NServiceBus.Core StackTrace:位於c:\\ TeamCity \\ buildAgent \\ work \\ nsb.master_10 \\ src \\ unicast \\ NServiceBus.Unicast \\ UnicastBus.cs:line中的NServiceBus.Unicast.UnicastBus.NServiceBus.IStartableBus.Start(Action startupAction) 852
我在A類中創建總線,如下所示:
public class A: IA
{
public static IBus Bus { get; private set; }
public A()
{
CreateBus();
}
private void CreateBus()
{
Bus = NServiceBus.Configure.With()
.CustomConfigurationSource(new AConfigSource())
.Log4Net()
.DefaultBuilder()
.XmlSerializer()
.MsmqTransport()
.IsTransactional(false)
.PurgeOnStartup(false)
.UnicastBus()
.LoadMessageHandlers()
.ImpersonateSender(false)
.CreateBus()
.Start(() => Configure.Instance.ForInstallationOn<NServiceBus.Installation.Environments.Windows>().Install());
// Exception thrown here ******
}
}
我的配置類:
public class AConfigSource: IConfigurationSource
{
#region Implementation of IConfigurationSource
public T GetConfiguration<T>() where T : class, new()
{
if (typeof(T) == typeof(MessageForwardingInCaseOfFaultConfig))
return MessageForwardingInCaseOfFaultConfiguration() as T;
if (typeof(T) == typeof(MsmqTransportConfig))
return MsmqTransportConfiguration() as T;
if (typeof(T) == typeof(UnicastBusConfig))
return UnicastBusConfiguration() as T;
// leaving the rest of the configuration as is:
return ConfigurationManager.GetSection(typeof(T).Name) as T;
}
#endregion Implementation of IConfigurationSource
#region Private
private MessageForwardingInCaseOfFaultConfig MessageForwardingInCaseOfFaultConfiguration()
{
return new MessageForwardingInCaseOfFaultConfig
{
ErrorQueue = "error"
};
}
private UnicastBusConfig UnicastBusConfiguration()
{
return new UnicastBusConfig();
}
private MsmqTransportConfig MsmqTransportConfiguration()
{
return new MsmqTransportConfig
{
ErrorQueue = "error",
InputQueue = "myInputQueue",
MaxRetries = 5,
NumberOfWorkerThreads = 1
};
}
#endregion Private
}
是什么原因導致NullReferenceException? 我錯過了哪些步驟來覆蓋所有nservicebus配置?
更新:我正在使用NServiceBus版本3.3.8。
更新:根據約翰的回答,我將私有UnicastBusConfiguration方法更改如下:
private UnicastBusConfig UnicastBusConfiguration()
{
return new UnicastBusConfig
{
ForwardReceivedMessagesTo = "",
MessageEndpointMappings = new MessageEndpointMappingCollection()
};
}
我仍然遇到上述相同的異常。
這是我需要在A類中運行的配置:
<configuration>
<configSections>
<section name="MsmqTransportConfig" type="NServiceBus.Config.MsmqTransportConfig, NServiceBus.Core" />
<section name="UnicastBusConfig" type="NServiceBus.Config.UnicastBusConfig, NServiceBus.Core" />
<section name="MessageForwardingInCaseOfFaultConfig" type="NServiceBus.Config.MessageForwardingInCaseOfFaultConfig, NServiceBus.Core" />
</configSections>
<MsmqTransportConfig ErrorQueue="error" NumberOfWorkerThreads="1" MaxRetries="5" />
<UnicastBusConfig ForwardReceivedMessagesTo="">
<MessageEndpointMappings></MessageEndpointMappings>
</UnicastBusConfig>
<MessageForwardingInCaseOfFaultConfig ErrorQueue="error" />
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="NServiceBus" publicKeyToken="9fc386479f8a226c" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-3.3.0.0" newVersion="3.3.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="NServiceBus.Core" publicKeyToken="9fc386479f8a226c" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-3.3.0.0" newVersion="3.3.0.0" />
</dependentAssembly>
</assemblyBinding>
</runtime>
</configuration>
詳細信息:我正在運行WPF應用程序。 我在解決方案中添加了一個類庫來托管nservicebus。 我創建了上述對象“ Class A”的實例。 我需要nservicebus基於A類的app.config進行配置,而不是基於WPF啟動項目的app.config。
也許CustomConfigurationSource是過大的? 有沒有更好的方法來命令NServiceBus在A類項目中使用app.config進行配置?
更新:我收到以下錯誤,指示缺少UnicastBus.cs類。 我在我的項目中引用了NserviceBus.Host ...
'c:\\ TeamCity \\ buildAgent \\ work \\ nsb.master_10 \\ src \\ unicast \\ NServiceBus.Unicast \\ UnicastBus.cs'的定位源。 (無校驗和。)文件'c:\\ TeamCity \\ buildAgent \\ work \\ nsb.master_10 \\ src \\ unicast \\ NServiceBus.Unicast \\ UnicastBus.cs'不存在。 在腳本文檔中查找'c:\\ TeamCity \\ buildAgent \\ work \\ nsb.master_10 \\ src \\ unicast \\ NServiceBus.Unicast \\ UnicastBus.cs'...在項目中查找'c:\\ TeamCity \\ buildAgent \\ work \\ nsb .master_10 \\ src \\ unicast \\ NServiceBus.Unicast \\ UnicastBus.cs”。 在項目中找不到文件。
只是猜測,但我會說您可能需要初始化一些UnicastBusConfig
屬性。
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