Name
Activator
Synopsis
This class is used to activate objects; that is, it either creates
an object or obtains a handle to an existing object. This class is generally used
in a variety of specialized conditions. For example, Activator
can create an object within another AppDomain
and hold a handle to that object. This effectively
gives a multidomain container application (such as ASP.NET) the ability
to reach into another AppDomain
to perform tasks within that domain
(such as closing down the AppDomain
in the event of a user request to shut down
the application server).
Activator
’s methods come in two distinct flavors: CreateInstance()
and CreateInstanceFrom()
. These create new objects
when given particular criteria (such as the type to create and the assembly from which to create it). The GetObject()
method uses published System.Runtime.Remoting.RemotingConfiguration
data to locate another object and obtain a handle to it (usually in
preparation for some remote-object method invocations).
All of the methods in Activator
return a System.Runtime.Remoting.ObjectHandle
, not the
actual object itself; this object
is actually a proxy to the created/remote object. As such, programmers must call Unwrap()
on
the returned ObjectHandle
to use the object. (Note that an explicit downcast is
required, since the return value is declared to be a generic Object
.)
Public NotInheritable Class Activator ' Public Shared Methods Public Shared Function CreateComInstanceFrom( ByVal assemblyName As ...
Get VB.NET Core Classes in a Nutshell now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.