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ADVANCED TOPIC Empty Catch Block Internals The CIL code corresponding to an empty catch block is, in fact, a catch(object) block This means that regardless of the type thrown, the empty catch block will catch it Interestingly, it is not possible to explicitly declare a catch(object) exception block within C# code Therefore, there is no means of catching a non-SystemException-derived exception and having an exception instance to scrutinize Ironically, unmanaged exceptions from languages such as C++ generally result in SystemRuntimeInteropServicesSEHException type exceptions, which derive from the SystemException type Therefore, not only can the unmanaged type exceptions be caught using a general catch block, but the non-SystemException-managed types that are thrown can be caught as well for instance, types such as string



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G A ->g A ->S . So the portrait is in the gold casket (and the inscription on the gold casket is false, but nothing can be concluded about the inscription on the silver casket). In the following exercises, there are three caskets rather than two. Each inscription gives one item of data which is to be added to the information that the portrait is in exactly one of the caskets. Exercise 7.36. Suppose that Portia put the following inscriptions on the three caskets. Gold: the portrait is in here. Silver: the portrait is in here. Lead: at least two of these caskets bears a false inscription. Which casket should the suitor choose Use the abbreviations I for 'the portrait is in the lead casket' and I for 'the inscription on the lead casket is true' in formulating your answer. Hint: use Exercise 7.15 to formulate the inscription on the lead casket. D





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Exception handling provides much-needed structure to the error-handling mechanisms that preceded it However, it can still make for some unwieldy results if used haphazardly The following guidelines offer some best practices for exception handling

Generally it is possible to handle some types of exceptions but not others For example, opening a file for exclusive read-write access may throw a SystemIOIOException because the file is already in use In catching this type of exception, the code can report to the user that the file is in use and allow the user the option of canceling the operation or retrying it Only exceptions for which there is a known action should be caught Other exception types should be left for callers higher in the stack

7: Calculational Logic: Part 2 Exercise 7.37. hi this version of the problem, Portia puts a dagger into one of the caskets. The suitor must choose a casket that does not contain the dagger. The inscriptions on the caskets are as follows. Gold: Silver: Lead: the dagger is in this casket. the dagger is not in this casket. at most one of these caskets bears a true inscription. D

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New programmers are often tempted to catch all exceptions and then continue executing instead of reporting an unhandled exception to the user However, this may result in a critical system problem going

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undetected Unless code takes explicit action to handle an exception or explicitly determines certain exceptions to be innocuous, catch blocks should rethrow exceptions instead of catching them and hiding them from the caller Predominantly, catch(SystemException) and general catch blocks should occur higher in the call stack, unless the block ends by rethrowing the exception

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Virtually all exceptions derive from SystemException However, the best way to handle some SystemExceptions is to allow them to go unhandled or to gracefully shut down the application sooner rather than later These exceptions include things such as SystemOutOfMemoryException and SystemStackOverflowException In CLR 4, such exceptions were defaulted to nonrecoverable such that catching them without rethrowing them will cause the CLR to rethrow them anyway These exceptions are runtime exceptions that the developer cannot write code to recover from Therefore, the best course of action is to shut down the application something the runtime will force in CLR 4 Code prior to CLR 4 should catch such exceptions only to run cleanup or emergency code (such as saving any volatile data) before shutting down the application or rethrowing the exception with throw;

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