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method, which is also called Dispose, but this Dispose method takes a Boolean parameter named disposing . This Dispose method is where you put all of the cleanup code . In the SafeHandle example, the method sets a flag indicating that the resource has been released and then calls the virtual ReleaseHandle method to actually perform the releasing of the resource . Note that the dispose pattern states that a single object can have Dispose or Close called on it multiple times; the first time, the resource should be released; for future calls, the method should just return (no exception should be thrown) . Note It is possible to have multiple threads call Dispose/Close on a single object simultaneously . However, the dispose pattern states that thread synchronization is not required . The reason is because code should be calling Dispose/Close only if the code knows for a fact that no other thread is using the object . If you don t know if an object is still in use at a certain point in your code, you should not be calling Dispose/Close . Instead, wait for a garbage collection to kick in so that it can determine if the object is no longer being used, and then release the resource .

Cool down, Thrasymachus Ask Callicles how long he s been programming How long, Callicles Well, I started on the Acropolis IV about 15 years ago I guess I ve seen about a dozen major systems from the time they were born to the time we gave them a cup of hemlock And I ve worked on major parts of a dozen more Two of those systems had over half a million lines of code, so I know what I m talking about Comments are pretty useless Socrates looked at the younger programmer As Callicles says, comments have a lot of legitimate problems, and you won t realize that without more experience If they re not done right, they re worse than useless Even when they re done right, they re useless, Callicles said Comments are less precise than a programming language I d rather not have them at all.

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When an object s Finalize method is called by the CLR, the Dispose method s disposing parameter is set to false This tells the Dispose method that it shouldn t execute any code that references other managed objects whose classes implement a Finalize method Imagine that the CLR is shutting down, and inside a Finalize method, you attempt to write to a FileStream This might not work because the FileStream might have already had its Finalize method called, closing the underlying disk file On the other hand, when you call Dispose or Close in your code, the Dispose method s disposing parameter must be set to true This indicates that the object is being explicitly disposed of, not finalized .

Wait a minute, Socrates said Ismene agrees that comments are less precise Her point is that comments give you a higher level of abstraction, and we all know that levels of abstraction are one of a programmer s most powerful tools I don t agree with that Instead of focusing on commenting, you should focus on making code more readable Refactoring eliminates most of my comments Once I ve refactored, my code might have 20 or 30 routine calls without needing any comments A good programmer can read the intent from the code itself, and what good does it do to read about somebody s intent when you know the code has an error Glaucon was pleased with his contribution Callicles nodded It sounds like you guys have never had to modify someone else s code, Ismene said.

In this case, the Dispose method is allowed to execute code that references another object (such as a FileStream); because you have control over the program s logic, you know that the FileStream object is still open By the way, if the SafeHandle class were sealed, the Dispose method that takes a Boolean should be implemented as a private method instead of a protected virtual method But since the SafeHandle class is not sealed, any class that derives from SafeHandle can override the Dispose method that takes a Boolean in order to override the cleanup code The derived class wouldn t implement the parameterless Dispose or Close methods, and it wouldn t override the Finalize method The derived class would simply inherit the implementation of all of these methods .

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