finalizer | 易学教程

Proper cleanup of WPF user controls

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I am relatively new to WPF, and some things with it are quite foreign to me. For one, unlike Windows Forms, the WPF control hierarchy does not support IDisposable. In Windows Forms, if a user control used any managed resources, it was very easy to clean up the resources by overriding the Dispose method that every control implemented. In WPF, the story is not that simple. I have searched for this for several hours, and encountered two basic themes: The first theme is Microsoft clearly stating that WPF does not implement IDisposable because the WPF controls have no unmanaged resources. While

c# finalizer throwing exception?

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问题 Quote from MSDN: If Finalize or an override of Finalize throws an exception, the runtime ignores the exception, terminates that Finalize method, and continues the finalization process. Yet if I have: ~Person() { throw new Exception("meh"); } then it results in a runtime exception? p.s. I know that this should never happen, however I'm just curious around this behaviour. One of our clients had an empty try catch around all of their finalizers.. it didn't even log when things went wrong or

Replacing finalize() in Java

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问题 Object.finalize() is deprecated in Java 9, and I think I understand the reasons why, but I'm having trouble seeing how to replace it. I have a utility class called Configuration which essentially has a single instance that owns everything in the application and lasts for the duration of the application. One of the services it provides is logging: on first request to log a message, a logger is created (for various legacy reasons it's my own Logger rather than a standard one), with a reference

what will the Finalizer thread do if there is a infinite loop or deadlock in the Java finalize method

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问题 what will the Finalizer thread do if there is a infinite loop or deadlock in the Java finalize method . 回答1: The spec writes: Before the storage for an object is reclaimed by the garbage collector, the Java Virtual Machine will invoke the finalizer of that object. The Java programming language does not specify how soon a finalizer will be invoked, except to say that it will happen before the storage for the object is reused. I read this to mean that the finalizer must have completed before

Finalizers and Dispose

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问题 I've got a class named BackgroundWorker that has a thread constantly running. To turn this thread off, an instance variable named stop to needs to be true . To make sure the thread is freed when the class is done being used, I've added IDisposable and a finalizer that invokes Dispose() . Assuming that stop = true does indeed cause this thread to exit, is this sippet correct? It's fine to invoke Dispose from a finalizer, right? Finalizers should always call Dispose if the object inherits

Why “Finalize method should not reference any other objects”?

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I have been pondering why it is recommended that we should not release managed resources inside finalize. If you see the code example at http://msdn.microsoft.com/en-us/library/system.gc.suppressfinalize.aspx , and search for string "Dispose(bool disposing) executes in two distinct scenarios" and read that comment, you will understand what I mean. Only possibility I can think of is that it probably has something to do with the fact that it is not possible to predict when finalizer will get called. Does anyone know the right answer ? thanks, mishal Jon Skeet If you're referencing another object

What if a finalizer makes an object reachable?

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In Java, finalize is called on an object (that overrides it) when it's about to be garbage collectioned, so when it's unreachable. But what if the finalizer makes the object reachable again, what happens then? The object will not be collected until it gets unreachable again. According to the JavaDoc , finalize() will not be called again. Then the object doesn't get garbage collected, basically. This is called object resurrection . Perform a search for that term, and you should get a bunch of interesting articles. As Jim mentioned, one important point is that the finalizer will only be run once

Troubleshooting a java memory leak: finalization?

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问题 I have a misbehaving application that seems to leak. After a brief profiler investigation, most memory (80%) is held by java.lang.ref.Finalizer instances. I suspect that finalizers fail to run. A common cause of this seems to be exceptions thrown from the finalizer. However, the javadoc for the finalize method of the Object class (see here for instance) seems to contradict itself: it states If an uncaught exception is thrown by the finalize method, the exception is ignored and finalization of

Why is it always necessary to implement IDisposable on an object that has an IDisposable member?

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From what I can tell, it is an accepted rule that if you have a class A that has a member m that is IDisposable, A should implement IDisposable and it should call m.Dispose() inside of it. I can't find a satisfying reason why this is the case. I understand the rule that if you have unmanaged resources, you should provide a finalizer along with IDisposable so that if the user doesn't explicitly call Dispose, the finalizer will still clean up during GC. However, with that rule in place, it seems like you shouldn't need to have the rule that this question is about. For instance... If I have a

Aren't destructors guaranteed to finish running?

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Destructors are weird . I was attempting to eliminate the need of using the disposable pattern by using 'smart' reference management, ensuring that the garbage collector could collect objects at the correct time. In one of my destructors I had to wait for an event from another object, which I noticed it didn't. The application simply shut down and the destructor was terminated in middle of execution. I'd expect a destructor is always allowed to finish running, but as the following test indicates that is not true. using System; using System.Diagnostics; using System.Threading; namespace