Long overdue (for me) question about disposing managed objects in .Net, VB.Net, C#

Posted by Jules on Stack Overflow See other posts from Stack Overflow or by Jules
Published on 2010-03-30T20:57:07Z Indexed on 2010/03/30 21:03 UTC
Read the original article Hit count: 477

Filed under:

.NET

|

idisposable

|

vb.net

|

c#

I can't believe I'm still confused about this but, any way, lets finally nail it:

I have a class that overrides OnPaint to do some drawing. To speed things up, I create the pens, brushes etc before hand, in the construtor, so that OnPaint does not need to keep creating and disposing them.

Now, I make sure that I always dispose of such objects, but I have the feeling I don't need to because, despite the fact they implement IDisposable, they're managed objects.

Is this correct?

© Stack Overflow or respective owner

Related posts about .NET

Apt-Get Update: failure to fetch; can't connect to any sources

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I realize there are dozens of "apt-get update: failure to fetch" questions (I read through all I could find), but my present circumstance is unique to 12.04 and it affects all sources; not just launchpad. Additionally, I've tried several different servers in Europe and the U.S. as well as the "main… >>> More
12.04: Apt-Get Update: failure to fetch; can't connect to any sources

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I realize there are dozens of "apt-get update: failure to fetch" questions (I read through all I could find), but my present circumstance is unique to 12.04 and it affects all sources; not just launchpad. Additionally, I've tried several different servers in Europe and the U.S. as well as the "main… >>> More
What's New in ASP.NET 4

as seen on Geeks with Blogs - Search for 'Geeks with Blogs'
The .NET Framework version 4 includes enhancements for ASP.NET 4 in targeted areas. Visual Studio 2010 and Microsoft Visual Web Developer Express also include enhancements and new features for improved Web development. This document provides an overview of many of the new features that are included… >>> More
.NET Reflector 6, .NET Reflector Pro, TestDriven.NET, .NET 4.0 and Mono

as seen on Simple Talk - Search for 'Simple Talk'
By now you may well have noticed that .NET Reflector 6 and .NET Reflector Pro are out in the wild. The official launch happened today, although we actually put the software out last Thursday as part of a phased release plan to ensure that everything went smoothly today which, so far, it seems to have… >>> More
Redmine on Apache2 with Passenger issue

as seen on Server Fault - Search for 'Server Fault'
I installed Redmine and run it in Apache2 with the Passenger module. Apache2 boots, Passenger module gets loaded and the Redmine welcome page is shown, however when trying to login or navigate to other parts of the Redmine site, the browser keeps loading and loading and loading forever, although the… >>> More

Related posts about idisposable

Should classes that are passed references to IDisposable objects be IDisposable as well and set them

as seen on Stack Overflow - Search for 'Stack Overflow'
I think the question says it all. Thanks. >>> More
Implementing IDisposable on a subclass when the parent also implements IDisposable

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a parent and child class that both need to implement IDisposable. Where should virtual (and base.Dispose()?) calls come into play? When I just override the Dispose(bool disposing) call, it feels really strange stating that I implement IDisposable without having an explicit Dispose() function… >>> More
Using Unity and interfaces, how do I create a concrete class that implements IDisposable

as seen on Stack Overflow - Search for 'Stack Overflow'
I have an interface (IDbAccess) for a database access class so that I can unit test it using Unity. It all works fine in Unity and now I want to make the concrete database class implement IDisposable so that it closes the db connections. My problem is that Unity does not understand that my concrete… >>> More
How do you reconcile IDisposable and IoC?

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm finally wrapping my head around IoC and DI in C#, and am struggling with some of the edges. I'm using the Unity container, but I think this question applies more broadly. Using an IoC container to dispense instances that implement IDisposable freaks me out! How are you supposed to know if… >>> More
When should I implement IDisposable?

as seen on Stack Overflow - Search for 'Stack Overflow'
What is the best practice for when to implement IDisposable? Is the best rule of thumb to implement it if you have one managed object in the class, or does it depend if the object was created in the class or just passed in? Should I also do it for classes with no managed objects at all? >>> More