finalizer

c++/cli Best practice for free GCHandle in the finalizer

由 喜你入骨 提交于 2019-12-07 07:05:28
问题 I have some functions in c and I would use this in a .net application. For this I wrote an Wrapper class with C++/cli. In the c interface is a callback function and wrapped this in a .net delegate. But how should I release the unmanaged ressources for the callback gcHandle? Is it allowd to call IsAllocated and Free from a GCHandle in the finalizer? Because it is an managed ressource and is it possibile that the gc already release it? Here is the code for the c interface: // C functions #ifdef

How to use PhantomReference as finalize() Replacement

由 試著忘記壹切 提交于 2019-12-07 03:09:44
问题 Javadoc 8 for PhantomReference states: Phantom references are most often used for scheduling pre-mortem cleanup actions in a more flexible way than is possible with the Java finalization mechanism. So I tried creating a thread that is calling the close() method of a Test Object that is eligible for garbage collection. The run() tries to get all Test Objects pre-mortem . Actually the retrieved Test Objects are all null . The expected behavior is, that the Test Objects are retrieved and the

Why does AppDomain.Unload() error in finalizer?

由 不羁岁月 提交于 2019-12-06 14:06:16
Here's some sample code: using System; namespace UnloadFromFinalizer { class Program { static void Main(string[] args) { Program p = new Program(); } AppDomain domain; Program() { this.domain = AppDomain.CreateDomain("MyDomain"); } ~Program() { AppDomain.Unload(this.domain);//<-- Exception thrown here } } } I have a class that creates an AppDomain in the constructor to be used over the lifetime of the object. I'd like to properly cleanup the AppDomain, so I thought I would call Unload in the finalizer. Unfortunately, that causes a CannotUnloadAppDomainException to be thrown. The MSDN

when finalize() is being executed? [duplicate]

由 喜欢而已 提交于 2019-12-06 09:41:25
This question already has answers here : When is the finalize() method called in Java? (17 answers) Closed 5 years ago . In an interview i was asked,suppose JVM runs gc when object of class A is not in used. class A{ //some code here protected void finalize(){ //code here } } does it guarantee the execution of finalize(). I said yes The next ques was if obj of Class A is being used, if now JVM runs GC does it execute finalize(). I said no, it'll not execute this finalize() as JVM does not collect A's object. However she did not comment anything but looked disappointed. Does i interpret it

Why is finalizer called on object

由 你说的曾经没有我的故事 提交于 2019-12-06 07:49:39
问题 Here is example program that exhibits surprising finalization behavior: class Something { public void DoSomething() { Console.WriteLine("Doing something"); } ~Something() { Console.WriteLine("Called finalizer"); } } namespace TestGC { class Program { static void Main(string[] args) { var s = new Something(); s.DoSomething(); GC.Collect(); //GC.WaitForPendingFinalizers(); s.DoSomething(); Console.ReadKey(); } } } If I run the program, what gets printed is: Doing something Doing something

Finalizer with CodeDom?

由 烈酒焚心 提交于 2019-12-06 07:36:16
Is it possible to add a Finalizer to a CodeDom generated class (other than using CodeSnippetTypeMember)? I couldn't find any information about it on MSDN. This was a known bug in .NET Framework and was reported some time back at http://lab.msdn.microsoft.com/ProductFeedback/viewFeedback.aspx?feedbackId=FDBK48431 But the link above is currently not working. You can view it using internet archive on the following link http://web.archive.org/web/20080224200911rn_2/connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=97599 I am not sure whether it was fixed or not. 来源： https:/

Why .NET Object has method Finalize()?

由 我们两清 提交于 2019-12-06 03:41:32
问题 I know that Finalize method is used by garbage collector to let object free up unmanaged resources. And from what I know, Object.Finalize is never called directly by GC (object is added to f-reachable queue during it's construction if it's type overrides the Finalize method by implementing finalizer). Object.Finalize is only called from autogenerated finalizer code : try { //My class finalize implementation } finally { base.Finalize(); // Here chain of base calls will eventually reach Object

IDisposable, Finalizers and the definition of an unmanaged resource

由 佐手、 提交于 2019-12-06 03:07:15
问题 I'm trying to make sure that my understanding of IDisposable is correct and there's something I'm still not quite sure on. IDisposable seems to serve two purpose. To provide a convention to "shut down" a managed object on demand. To provide a convention to free "unmanaged resources" held by a managed object. My confusion comes from identifying which scenarios have "unmanaged resources" in play. Say you are using a Microsoft-supplied IDisposable -implementing (managed) class (say, database or

Is closing the connection in finalize best practice? [duplicate]

由 ▼魔方 西西 提交于 2019-12-05 22:51:13
问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Why would you ever implement finalize()? I saw some java files with the following code: public void finalize() { if (conn != null) { try { conn.close(); } catch (SQLException e) { } } } Is closing a Connection in the finalize method best practice? Is it enough to close the Connection or does one need to also close other objects such as PreparedStatement ? 回答1: From Java 7, the best practice for closing a

Finalizer not called

由 折月煮酒 提交于 2019-12-05 09:50:44
I have a class in C# where I want to close out some communication ports properly when my class is being disposed. However, the finalizer is never being called when I exit the program. Why is that? Am I doing something wrong? I am calling the dispose manually which goes through and closes all communications. This is not fired either. Here is the finalizer I am using: ~Power() { Dispose(false); } The finalizer (which is what you're using here) is only called during the Finalization phase, which will happen during GC. If you implement IDisposable correctly, this should never get called. I cover
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