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Sometimes an enumerator holds a valuable resource, such as a database connection. The resources will be released when the enumerator is finalized, but it d be useful if the resource could be released when the enumerator was no longer needed. Because of this, the expansion of a foreach isn t quite as simple as implied previously. The C# compiler does this by relying on the IDisposable interface, in a similar manner to the using statement. It s a bit more complicated in this case, however. For the using statement, it s easy for the compiler to determine whether the class implements IDisposable, but that s not true in this case. The compiler must handle three cases when it expands: foreach (Resource r in container)

This example handles the exception in the same method where it was raised, but that s actually pretty uncommon. More likely, no local exception handler is found, so the system traverses the call stack looking for an exception handler, first in the current method s caller, then that method s caller, and so on. This search continues down the call stack until an exception handler is found. If none is found, a special-case scenario can be configured to handle the uncaught exception. By default, a Cocoa app that encounters an uncaught exception will print some info about the exception to the console log, and then try to continue running as usual.

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In this case, the compiler must determine dynamically whether the class implements IDisposable. The foreach expands to the following: IEnumerator e = container.GetEnumerator(); try { while (e.MoveNext()) { Resource r = e.Current; ...; } } finally { IDisposable d = e as IDisposable; if (d != null) d.Dispose(); }

In Cocoa, exceptions are used to make a method break out of its normal operating flow in case of a serious problem that should not occur while the program is running In general, if your code causes an exception to be raised, you ve got a bug With few exceptions, a properly written Cocoa program should be able to run forever without a single exception ever being raised If you have a background in Java, Ruby, Python, or C++, this may seem a little restrictive In many other environments, exceptions are used a little more freely, such as a file-reading method raising an exception to tell the caller that it s read to the end of the file (which, if you think about it, is not an exceptional state at all, because every file has an end).

If the compiler can statically know that a class implements IDisposable, the compiler will call Dispose() without the dynamic test:

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In Python, one common idiom for iterating through an array is to increment an index, try to read the indexed value from the array, and catch the resulting exception when you read past the end In Cocoa, however, this sort of thing is frowned upon, and exceptions are normally used only for reporting unexpected results that are probably caused by a bug in the program Because of the rather limited role of exceptions in Cocoa, you don t often see a lot of exception-handling code inside Cocoa apps Unlike Java, Objective-C doesn t require (or even allow) its methods to specify what kinds of exceptions they may raise, and in theory you don t really have to handle them at all.

IEnumerator e = container.GetEnumerator(); try { while (e.MoveNext()) { Resource r = e.Current; ...; } } finally { ((IDisposable) e).Dispose(); }

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