c# – entlib 6 logger实例化中的错误

我在为Enterprise Library 6.0日志记录组件设置logwriter时遇到异常.在第一次发生日志记录时,它会成功.但是对于连续调用,它会引发异常：LogWriter已经设置好了.我试过检查Logger.Writer是否为空.但是这在第一个实例中失败了,除了我应该使用Logger.SetLogWriter设置编写器.

这是我的代码：

if (Logger.Writer == null)  // fails on first call
{
    IConfigurationSource configurationSource = ConfigurationSourceFactory.Create();
    LogWriterFactory logWriterFactory = new LogWriterFactory(configurationSource);
    Logger.SetLogWriter(logWriterFactory.Create()); // fails on subsequent calls.
}

IConfigurationSource configurationSource = ConfigurationSourceFactory.Create();
LogWriterFactory logWriterFactory = new LogWriterFactory(configurationSource);
Logger.SetLogWriter(logWriterFactory.Create(),false);