Adds the elements of a IPlugin array to the current PluginCollection. 
 Adds the elements of a IPlugin array to the current PluginCollection. 
public virtual int AddRange(IPlugin[]);
 Adds the elements of another PluginCollection to the current PluginCollection. 
public virtual int AddRange(PluginCollection);
 Adds the elements of a IPlugin collection to the current PluginCollection. 
public virtual int AddRange(ICollection);
PluginCollection Class | log4net.Plugin Namespace