log4net encoding problem

https://logging.apache.org/log4net/release/sdk/html/P_log4net_Appender_FileAppender_Encoding.htm

The default encoding set is Default which is the encoding for the system's current ANSI code page.             

在cmd命令行的窗体标题上面右键，看属性，可以知道操作系统当前的code page.