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Exception-Handling Mechanics
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In this section, I ll introduce the mechanics and C# constructs needed in order to use exception handling, but it s not my intention to explain them in great detail . The purpose of this chapter is to offer useful guidelines for when and how to use exception handling in your code . If you want more information about the mechanics and language constructs for using exception handling, see the .NET Framework documentation and the C# language specification . Also, the .NET Framework exception-handling mechanism is built using the Structured Exception Handling (SEH) mechanism offered by Microsoft Windows . SEH has been discussed in many resources, including my own book, Windows via C/C++, 5th ed . (Microsoft Press, 2007), which contains three chapters devoted to SEH . The following C# code shows a standard usage of the exception-handling mechanism . This code gives you an idea of what exception-handling blocks look like and what their purpose is . In the subsections after the code, I ll formally describe the try, catch, and finally blocks and their purpose and provide some notes about their use .
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In fact, C# s extension method feature exists in the language to allow you to chain more methods together that would not have been chainable otherwise .
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private void SomeMethod() { try { // } catch // } catch // } catch //
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Put code requiring graceful recovery and/or cleanup operations here... (InvalidOperationException) { Put code that recovers from an InvalidOperationException here... (IOException) { Put code that recovers from an IOException here... { Put code that recovers from any kind of exception other than those above here...
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// When catching any exception, you usually re-throw the exception. // I explain re-throwing later in this chapter. throw; } finally { // Put code that cleans up any operations started within the try block here... // The code in here ALWAYS executes, regardless of whether an exception is thrown. } // Code below the finally block executes if no exception is thrown within the try block // or if a catch block catches the exception and doesn't throw or re-throw an exception. }
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This code demonstrates one possible way to use exception-handling blocks . Don t let the code scare you most methods have simply a try block matched with a single finally block or a try block matched with a single catch block . It s unusual to have as many catch blocks as in this example . I put them there for illustration purposes .
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A try block contains code that requires common cleanup operations, exception-recovery operations, or both . The cleanup code should be placed in a single finally block . A try block can also contain code that might potentially throw an exception . The exception-recovery code should be placed in one or more catch blocks . You create one catch block for each kind of exception that your application can safely recover from . A try block must be associated with at least one catch or finally block; it makes no sense to have a try block that stands by itself, and C# will prevent you from doing this . Important Sometimes developers ask how much code they should put inside a single try
block . The answer to this depends on state management . If, inside a try block, you execute multiple operations that could all throw the same exception type and the way that you d recover this exception type is different depending on the operation, then you should put each operation in its own try block so that you can recover your state correctly .
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