<para>The <seecref="M:GLib.VolumeMonitor.MountPreUnmount"/> event utilizes this delegate:</para>
<para>Event data is passed via the <seecref="T:GLib.MountPreUnmountArgs"/> parameter.</para>
<para>To attach a <seecref="T:GLib.MountPreUnmountHandler"/> to an event, add the MountPreUnmountHandler instance to the event. The methods referenced by the MountPreUnmountHandler instance are invoked whenever the event is raised, until the MountPreUnmountHandler is removed from the event.</para>