Essential .NET, Volume 1: The Common Language Runtime

Permissions

Permission sets are ultimately just a collection of zero or more individual permissions. The CLR exposes permission sets programmatically via System.Security.PermissionSet. Because PermissionSet implements the System.Collections.ICollection interface, one can treat the permission set as a standard collection. The elements of that collection are guaranteed to implement at least the System.Security.IPermission interface.

The IPermission interface is the primary interface for dealing with permissions. The IPermission interface models the permission settings for one category of operations. The CLR ships with a dozen or so built-in categories, each of which supports the IPermission interface. For a particular category of permission, there ...