Garbage collection is for memory. You need to dispose of non-memory resources – file handles, sockets, GDI+ handles, database connections etc. That’s typically what underlies an IDisposable type, although the actual handle can be quite a long way down a chain of references. For example, you might Dispose an XmlWriter which disposes a StreamWriter it … Read more
The CLR documentation states that whoever creates a Disposable object is responsible for calling Dispose. In this case the object is created by Ninject. That means you should not call Dispose explicitly. Ninject disposes every Disposable object that has another scope other than InTransientScope as soon as the scope object to which the created object … Read more
When I just override the Dispose(bool disposing) call, it feels really strange stating that I implement IDisposable without having an explicit Dispose() function (just utilizing the inherited one), but having everything else. This is something you shouldn’t be concerned with. When you subclass an IDisposable class, all of the “Dispose pattern” plumbing is already being … Read more
If you access the AvailableWaitHandle property, then Yes, you must call Dispose() to cleanup unmanaged resources. If you do not access AvailableWaitHandle, then No, calling Dispose() won’t do anything important. SemaphoreSlim will create a ManualResetEvent on demand if you access the AvailableWaitHandle. This may be useful, for example if you need to wait on multiple … Read more
The fact that you need to ensure that the object is disposed indicates a design flaw. It’s fine if disposing is the polite or efficient thing to do, but it should not be semantically necessary. There is no way to enforce that an object is disposed of via the using statement. However, what you can … Read more
Do I really need to Dispose() every Process object and how do I decide if I need to do so? Yes, you should dispose them. Note this text in the documentation for Process: A system process is uniquely identified on the system by its process identifier. Like many Windows resources, a process is also identified … Read more
So it seems like the calling code needs to know about and take ownership of the response message as well as the stream, or I leave the response message undisposed and let the finalizer deal with it. Neither option feels right. In this specific case, there are no finalizers. Neither HttpResponseMessage or HttpRequestMessage implement a … Read more
Let’s get controversial! I disagree with the general MVC + EF consensus that keeping a context alive throughout the entire request is a good thing for a number of reasons: Low performance increase Do you know how expensive creating a new database context is? Well… “A DataContext is lightweight and is not expensive to create” … Read more
You don’t manually destroy .Net objects. That’s what being a managed environment is all about. In fact, if the object is actually reachable, meaning you have a reference you can use to tell the GC which object you want to destroy, collecting that object will be impossible. The GC will never collect any object that’s … Read more
You should be safe to call it more than once, though you should probably avoid it if you can. From the MSDN page on IDisposable.Dispose(): If an object’s Dispose method is called more than once, the object must ignore all calls after the first one. The object must not throw an exception if its Dispose … Read more