打包后的程序运行报错：
base = "System.MissingMethodException: Default constructor not found for type log4net.Repository.Hierarchy.Hierarchy\r\n
at System.RuntimeType.CreateInstanceMono (System.Boolean nonPublic, System.Boolean wrapExceptions) [0x00076] in <4899add98f17447bac12e1861ae2d...
解决方案：
Managed Stripping Level 改为 Disabled 即可（之前被改成了 Low）
