为什么配置文件中无法识别log4net？

我使用log4net在C＃中编写了一个测试控制台应用程序：

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using log4net; using log4net.Config; [assembly: log4net.Config.XmlConfigurator(Watch = true)] namespace Log4Net_Test { class Program { private static readonly ILog log = LogManager.GetLogger(typeof(Program)); static void Main(string[] args) { log.Info("Entering application"); log.Debug("Debug message"); log.Info("Leaving application"); } } } 

我的App.config文件如下所示：

执行测试程序最终会出现以下错误消息：

 log4net:ERROR Exception while reading ConfigurationSettings. Check your .config file is well formed XML. System.Configuration.ConfigurationErrorsException: Configuration system failed t o initialize ---> System.Configuration.ConfigurationErrorsException: Unrecognize d configuration section log4net. 

我的配置文件有什么问题？

更新1：如configSections´ part was missing, as pointed out in the accepted answer. But I also had to remove the configSections´ part was missing, as pointed out in the accepted answer. But I also had to remove the启动section, otherwise the same error appeared. I do not know why the section, otherwise the same error appeared. I do not know why the `部分也导致问题。 也许更有经验的人可以讲述和撰写评论。

Answer 1

您还需要在section block中添加log4net

Answer 2

还需要删除启动部分，因为log4net不支持Framework .NET4.5

你可以在这里看到我的类似答案： https ： //stackoverflow.com/a/13236410/1783224

或者您可以在文档中看到支持的框架： http ： //logging.apache.org/log4net/release/features.html

Answer 3

您还应该记住，部分块< configSections >必须位于< configuration >之下，否则将发生错误：

读取ConfigurationSettings时出现exception。 检查.config文件是否格式正确。

例如：