24 namespace Ntp.Common.Log
    30             Threshold = threshold;
    36         public bool IsSysLog { 
get; }
    38         public abstract void Close();
    40         public abstract void Initialize();
    42         public abstract void Resume();
    44         public abstract void Suspend();
    46         public abstract void WriteLine(
string text, 
Severity severity);
    48         public abstract void WriteLine(Exception exception, 
Severity severity);
    50         public abstract void WriteLine(Exception exception);
 LogBase(Severity threshold, bool isSysLog=false)