1 what is the difference between finalize and dispose

Faster method for instant disposal of the objects. It is deterministic function as Dispose method is explicitly called by the User Code.

Example:user interface Controls. Forms, SqlConnection class have built in implementaion of Dispose method. Finalize - This method is called internally unlike Dispose method which is called explicitly.

By Local Coders in. NET on Oct 19 Nov, 4. Oct, Charles Possible duplicate of What is the difference between using IDisposable vs a destructor in C? Add a comment. Active Oldest Votes. Samuel Samuel You need to be a bit careful about calling Dispose from your Finalize implementation -- Dispose may also dispose managed resources, which you don't want to touch from your finalizer, as they may already have been finalized themselves.

The standard IDisposal pattern and the hidden implementation of a Dispose bool to handle disposing managed components optional seems to cater for that issue. Or am I wrong? Could someone give me an example when both should be implemented? But it's a best practice to implement both. InteXX 5, 5 5 gold badges 33 33 silver badges 61 61 bronze badges. Brian Rasmussen Brian Rasmussen k 34 34 gold badges silver badges bronze badges.

I could not understand this approved answer. I still want to know the different. What it is? Ismael: The biggest situation where Finalize may be justified is when there are a number of objects which are interested in having a resource kept alive, but there's no means by which an object that ceases to be interested in the resource can find out if it's the last one. In such case, Finalize will usually only fire when nobody's interested in the object.

The loose timing of Finalize is horrible for non-fungible resources such as files and locks, but may be okay for fungible resources. The context made it pretty clear, but just in case for the rest of us, here's what wikipedia says: "Fungibility is the property of a good or a commodity whose individual units are capable of mutual substitution, such as sweet crude oil, shares in a company, bonds, precious metals, or currencies.

JonCoombs: That's pretty much right, though it may be worth noting that the term "fungible resource" is applied to things which are freely substitutable until they are acquired and become freely substitutable again after release or abandonment.

If the system has a pool of lock objects and code acquires one which it associates with some entity, then as long as anyone is holding that a reference to that lock for the purpose of associating it with that entity , that lock may not be substituted with any other. If all code that cares about the guarded entity abandons the lock, however, Show 1 more comment. As the user of an object, you always use Dispose.

Finalize is for the GC. See e. The original recommended pattern for classes which held a mix of self-cleaning "managed" and non-self-cleaning "unmanaged" resources has long been obsolescent. A better pattern is to separately wrap every unmanaged resource into its own managed object which doesn't hold any strong references to anything which isn't necessary for its cleanup. Everything to which a finalizable object holds a direct or indirect strong reference will have its GC lifetime extended.

Encapsulating the things that are needed for cleanup will let one avoid extending the GC lifetime of things that aren't. JCoombs: Dispose is good, and implementing it correctly is generally easy.

Finalize is evil, and implementing it correctly is generally hard. Among other things, because the GC will ensure that no object's identity will ever get "recycled" as long as any reference to that object exists, it's easy to cleaning up a bunch of Disposable objects, some of which may have already been cleaned up, is no problem; any reference to an object on which Dispose has already been called will remain a reference to an object upon which Dispose has already been called.

JCoombs: Unmanaged resources, by contrast, generally have no such guarantee. If object Fred owns file handle 42 and closes it, the system might attach that same number to some the file handle which is given to some other entity. In that case, file handle 42 would not refer to Fred's closed file, but to the file that was in active use by that other entity; for Fred to try to close handle 42 again would be disastrous. Trying to keep track of multiple objects is much harder.

JCoombs: If every unmanaged resource is placed in its own wrapper object which does nothing but control its lifetime, then outside code which doesn't know whether the resource has been released, but knows that it should be if it hasn't been already , can safely ask the wrapper object to release it; the wrapper object will know if it has done so and can carry out or ignore the request. The fact that the GC guarantees that a reference to the wrapper will always be a valid reference to the wrapper is a very useful guarantee.

Finalize gets called by the GC when this object is no longer in use. Dispose is just a normal method which the user of this class can call to release any resources. Bhushan Bhangale Bhushan Bhangale Cleanest answer ever — dariogriffo. This should be written in official documentation — Alek Depler. Finalize Finalizers should always be protected , not public or private so that the method cannot be called from the application's code directly and at the same time, it can make a call to the base.

Finalize method Finalizers should release unmanaged resources only. The framework does not guarantee that a finalizer will execute at all on any given instance. Never allocate memory in finalizers or call virtual methods from finalizers.

Avoid synchronization and raising unhandled exceptions in the finalizers. The execution order of finalizers is non-deterministic—in other words, you can't rely on another object still being available within your finalizer. Do not define finalizers on value types. Don't create empty destructors. In other words, you should never explicitly define a destructor unless your class needs to clean up unmanaged resources and if you do define one, it should do some work.

If, later, you no longer need to clean up unmanaged resources in the destructor, remove it altogether. Dispose Implement IDisposable on every type that has a finalizer Ensure that an object is made unusable after making a call to the Dispose method.

In other words, avoid using an object after the Dispose method has been called on it. Call Dispose on all IDisposable types once you are done with them Allow Dispose to be called multiple times without raising errors.

Suppress later calls to the finalizer from within the Dispose method using the GC. The Finalize implementation would run and the resources would still be released when the object is garbage collected even if a developer neglected to call the Dispose method explicitly.

Cleanup the unmanaged resources in the Finalize method as well as Dispose method. Additionally call the Dispose method for any. NET objects that you have as components inside that class having unmanaged resources as their member from the Dispose method.

Umar Abbas 4, 1 1 gold badge 16 16 silver badges 22 22 bronze badges. GenZiy GenZiy 1, 2 2 gold badges 14 14 silver badges 19 19 bronze badges. I read this same answer everywhere and still i cannot understand what is the purpose of each one. I only read rules after rules, nothing more. Ismael: and also author doesnt add anything except for copying and pasting some text from MSDN. I did have "promise" conception that time i asked this. Dispose should free both managed and unmanaged resources.

Marc L. MirlvsMaximvs MirlvsMaximvs 1, 1 1 gold badge 22 22 silver badges 31 31 bronze badges. How can we use in real time. Can any one help me on this. Posted 8-Mar pm N Srinivasula Reddy.

Add a Solution. Sergey Alexandrovich Kryukov 9-Mar am. Aha, real time Top Rated Most Recent. Accept Solution Reject Solution. Nice article shares when and how to use finalize and dispose in. Posted 8-Mar pm Ganesan Senthilvel. Please also see my comments to Solutions 1 and 2. You also need to understand how System. For some use of System. Posted 8-Mar pm Sergey Alexandrovich Kryukov. Finalize is called by Garbage Collector implicitly to free unmanaged resources. The garbage collector calls this method at some point after there are no longer valid references to the object.

There are some resources like windows handles, database connections which cannot be collected by the garbage collector. Therefore the programmer needs to call Dispose method of IDisposable interface. Dispose of IDisposable interface is called by the programmer to explicitly release resources when they are no longer being used. Dispose can be called even if other references to the object are alive. Posted 8-Mar pm member Basically correct, I voted 4. It is important to note, that IDisposable and IDisposable.

Dispose formally is not related to any kind of clean up of any resources.