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如何获得来自自定义布局渲染器的整数值？NLog自定义布局渲染器整数
我在尝试使用自定义布局渲染器设置需要整数的目标的属性时收到异常。通过单步执行代码，它看起来像是在写入目标的日志条目处将自定义布局渲染器替换为它们的值。抛出的异常在创建logger对象时发生 - 大概是在处理NLog.config时，以及当它看到对自定义布局渲染器而不是整数的引用时，会抛出异常。
这是自定义布局呈示：
[LayoutRenderer("buffer-size")]
public class BufferSizeLayoutRenderer : LayoutRenderer
{
protected override void Append(StringBuilder builder, LogEventInfo logEvent)
{
int BufferSize=150; // would actually read from externally managed settings
builder.Append(BufferSize);
}
}
我在NLog.config注册的扩展组件。
到自定义布局渲染器引用是BufferingWrapper目标是这样的：
<target xsi:type="BufferingWrapper"
name="InfoBufferingTarget"
bufferSize="${buffer-size}"
flushTimeout="60000"
slidingTimeout="true">
而当代码行执行创建该记录器对象，这将引发异常：
NLog.NLogConfigurationException was unhandled by user code
HResult=-2146233088
Message=Error when setting property 'BufferSize' on BufferingWrapper Target[InfoBufferingTarget]()
Source=NLog
StackTrace:
at NLog.Internal.PropertyHelper.SetPropertyFromString(Object o, String name, String value, ConfigurationItemFactory configurationItemFactory)
at NLog.Config.XmlLoggingConfiguration.ConfigureObjectFromAttributes(Object targetObject, NLogXmlElement element, Boolean ignoreType)
at NLog.Config.XmlLoggingConfiguration.ParseTargetElement(Target target, NLogXmlElement targetElement)
at NLog.Config.XmlLoggingConfiguration.ParseTargetsElement(NLogXmlElement targetsElement)
at NLog.Config.XmlLoggingConfiguration.ParseNLogElement(NLogXmlElement nlogElement, String baseDirectory)
at NLog.Config.XmlLoggingConfiguration.ParseTopLevel(NLogXmlElement content, String baseDirectory)
at NLog.Config.XmlLoggingConfiguration.Initialize(XmlReader reader, String fileName, Boolean ignoreErrors)
at NLog.Config.XmlLoggingConfiguration..ctor(String fileName)
at NLog.LogFactory.LoadLoggingConfiguration(String configFile)
at NLog.LogFactory.get_Configuration()
at NLog.LogFactory.GetLogger(LoggerCacheKey cacheKey)
at NLog.LogFactory.GetLogger(String name)
at NLog.LogManager.GetCurrentClassLogger()
at MyCompany.NLogRepository..ctor() in c:\Source\NLogRepository.cs:line 19
at MyCompany.Controllers.LogController.Post(Data data) in c:\Source\LogController.cs:line 21
at lambda_method(Closure , Object , Object[])
at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClassc.<GetExecutor>b__6(Object instance, Object[] methodParameters)
at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object instance, Object[] arguments)
at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)
InnerException:
HResult=-2146233088
Message=${buffer-size} is not a valid value for Int32.
Source=System
StackTrace:
at System.ComponentModel.BaseNumberConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value)
at System.ComponentModel.TypeConverter.ConvertFromInvariantString(String text)
at NLog.Internal.PropertyHelper.TryTypeConverterConversion(Type type, String value, Object& newValue)
at NLog.Internal.PropertyHelper.SetPropertyFromString(Object o, String name, String value, ConfigurationItemFactory configurationItemFactory)
InnerException: System.FormatException
HResult=-2146233033
Message=Input string was not in a correct format.
Source=mscorlib
StackTrace:
at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal)
at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info)
at System.ComponentModel.Int32Converter.FromString(String value, NumberFormatInfo formatInfo)
at System.ComponentModel.BaseNumberConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value)
InnerException:
在执行自定义布局渲染器中的代码之前抛出此异常。我的终极目标 - 我需要能够在运行时修改NLog设置，而不会覆盖NLog.config，在我的情况下，这需要完整的应用程序部署。我希望能够调整BufferingWrapper设置并查看对性能的影响。如果还有其他方法可以在不使用自定义布局渲染器的情况下完成此操作，并且不需要在代码中完整创建NLog配置，请告诉我们。
任何帮助将不胜感激。