C# log4net:找不到名为[SocketAppender]的错误追加器

运行单元测试时出现以下错误：

log4net:ERROR Could not create Appender [SocketAppender] of type [log4net.Appender.SocketAppender, Log4netSocketAppender]. Reported error follows.
System.IO.FileNotFoundException: Could not load file or assembly 'Log4netSocketAppender' or one of its dependencies. The system cannot find the file specified.
File name: 'Log4netSocketAppender'
   at System.RuntimeTypeHandle.GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMarkHandle stackMark, IntPtr pPrivHostBinder, Boolean loadTypeFromPartialName, ObjectHandleOnStack type)
   at System.RuntimeTypeHandle.GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean loadTypeFromPartialName)
   at System.RuntimeType.GetType(String typeName, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark& stackMark)
   at System.Type.GetType(String typeName, Boolean throwOnError, Boolean ignoreCase)
   at log4net.Util.SystemInfo.GetTypeFromString(Assembly relativeAssembly, String typeName, Boolean throwOnError, Boolean ignoreCase)
   at log4net.Util.SystemInfo.GetTypeFromString(String typeName, Boolean throwOnError, Boolean ignoreCase)
   at log4net.Repository.Hierarchy.XmlHierarchyConfigurator.ParseAppender(XmlElement appenderElement)

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有人能帮忙吗？

你的应用程序中是否包含

SocketAppender

库？是的，它包含在内。