log4net：加载自定义附加程序时出错
我扩展了 AppenderSkeleton 以创建一个名为 HTTPAppender 的自定义附加程序，但 xml 文件中对其的引用出现了问题。 Log4Net 显然无法找到我的自定义附加程序。有没有办法从 xml 文件引用它以指向我的项目，或者我是否必须将自定义附加程序的源代码添加到 log4net 中，以便将其打包在 log4net.dll 中？
调试时，我在“立即”窗口中收到以下错误：
log4net:ERROR XmlHierarchyConfigurator: Could not create Appender [HTTPAppender] of type [HTTPAppender.HTTPAppender,HTTPAppender]. Reported error follows. System.IO.FileNotFoundException: Could not load file or assembly 'HTTPAppender' or one of its dependencies. The system cannot find the file specified. File name: 'HTTPAppender' at System.RuntimeTypeHandle._GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark& stackMark, Boolean loadTypeFromPartialName) at System.RuntimeTypeHandle.GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark& stackMark) ...etc
这是 xml 文件的 log4net 部分：
I extended AppenderSkeleton to create a custom appender called HTTPAppender, but something is up with the reference to it in the xml file. Log4Net is clearly unable to find my custom appender. Is there a way to reference it from the xml file to point to my project, or would I have to add my custom appender's source code to log4net's so it's packaged in log4net.dll?
I get the following error in the Immediate window when debugging:
log4net:ERROR XmlHierarchyConfigurator: Could not create Appender [HTTPAppender] of type [HTTPAppender.HTTPAppender,HTTPAppender]. Reported error follows. System.IO.FileNotFoundException: Could not load file or assembly 'HTTPAppender' or one of its dependencies. The system cannot find the file specified. File name: 'HTTPAppender' at System.RuntimeTypeHandle._GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark& stackMark, Boolean loadTypeFromPartialName) at System.RuntimeTypeHandle.GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark& stackMark) ...etc
Here's the log4net section of the xml file:
<log4net>
<appender name="HTTPAppender" type="HTTPAppender.HTTPAppender,HTTPAppender">
<evaluator type="log4net.Core.LevelEvaluator,log4net">
<threshold value="WARN"/>
</evaluator>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="#%level - %message" />
</layout>
</appender>
<root>
<level value="ALL" />
<appender-ref ref="HTTPAppender" />
</root>
<logger name="log4netErrorLog" >
<level value="DEBUG" />
<appender-ref ref="HTTPAppender" />
</logger>
</log4net>
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我认为这会对您有所帮助
http://weblogs.asp.net/tgraham/archive/2007/05/02/loading-the- assembly-for-a-custom-log4net-appender.aspx
i think this will help you
http://weblogs.asp.net/tgraham/archive/2007/05/02/loading-the-assembly-for-a-custom-log4net-appender.aspx
如果您使用任何非标准程序集，请将它们与程序集一起放在应用程序目录中。如果这没有帮助，请尝试为程序集指定一个强名称并在 log4net 配置文件中使用全名。您也可以尝试将其放入 GAC 中。
If you are using any non standard assemblies, put them in the application directory together with your assembly. If that doesn't help, try giving your assembly a strong name and using the full name in the log4net config file. you can also try putting it into GAC.
我假设找不到该程序集。程序集的名称确实是“HTTPAppender”吗？它是否与调用程序集位于同一路径中？
I would assume that the assembly cannot be found. Is the name of the assembly indeed 'HTTPAppender' and is it in the same path as the calling assembly?
我也遇到过同样的问题。如果您的自定义附加程序项目使用特定的
log4net.dll，并且将要使用自定义附加程序的项目使用不同的log4net.dll，则它将无法找到它。I've had the same issue. If your custom appender project uses a certain
log4net.dll, and your project that's going to use your custom appender uses a differentlog4net.dll, it will not be able to find it.我最近遇到了同样的问题。我通过在类型的完全限定名称后面添加程序集名称并在类型属性中使用逗号来修复此问题。请看下文。
I run into the same issue recently. I fixed it by adding the assembly name after the fully qualified name of the type with a comma in the type attribute. Please see below.
我也被这个问题困扰了，最后我解决了。
解决方案是HTTPAppender类应该有一个默认构造函数。
我确信这个错误“无法创建Appender”是因为没有默认构造函数而出现的
I was also stuck in that issue finally I fixed it.
The solution is HTTPAppender class should have a Default contructor.
I am confident about that this error "Could not create Appender" is come because doesn't have default constructor