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C# exception handling is managed via four keywords: try, catch, throw, and finally They form an interrelated subsystem in which the use of one implies the use of another Throughout the course of this chapter, each keyword is examined in detail However, it is useful at the outset to have a general understanding of the role each plays in exception handling Briefly, here is how they work Program statements that you want to monitor for exceptions are contained within a try block If an exception occurs within the try block, it is thrown Your code can catch this exception using catch and handle it in some rational manner System-generated exceptions are automatically thrown by the runtime system To manually throw an exception, use the keyword throw Any code that absolutely must be executed upon exiting from a try block is put in a finally block

You can use the for loop, the if statement, and code blocks to create an improved version of the Fahrenheit-to-Celsius converter that you developed in the first Try This example This new version will print a table of conversions, beginning with 0 degrees Fahrenheit and ending with 99 After every 10 degrees, a blank line will be output This is accomplished through the use of a variable called counter that counts the number of lines that have been output Pay special attention to its use

At the core of exception handling are try and catch These keywords work together, and you can t have a catch without a try Here is the general form of the try/catch exception-handling blocks: try { // block of code to monitor for errors } catch (ExcepType1 exOb) { // handler for ExcepType1 } catch (ExcepType2 exOb) { // handler for ExcepType2 }

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Here, ExcepType is the type of exception that has occurred When an exception is thrown, it is caught by its corresponding catch clause, which then processes the exception As the general form shows, more than one catch clause can be associated with a try The type of the exception determines which catch is executed That is, if the exception type specified by a catch matches that of the exception, then that catch is executed (and all others are bypassed) When an exception is caught, the exception variable exOb will receive its value Actually, specifying exOb is optional If the exception handler does not need access to the exception object (as is often the case), there is no need to specify exOb The exception type alone is sufficient For this reason, many of the examples in this chapter will not specify exOb Here is an important point: If no exception is thrown, then a try block ends normally, and all of its catch clauses are bypassed Execution resumes with the first statement following the last catch Thus, a catch is executed only if an exception is thrown

(continued)

Here is a simple example that illustrates how to watch for and catch an exception As you know, it is an error to attempt to index an array beyond its boundaries When this error occurs, the CLR throws an IndexOutOfRangeException, which is a standard exception

13:

Although the preceding examples show the how behind delegates, they don t really illustrate the why In general, delegates are useful for two main reasons First, as you will soon see, delegates support events Second, delegates give your program a way to execute methods at runtime without having to specify what that method is at compile time This ability is quite useful when you want to create a framework that allows components to be plugged in For example, imagine a drawing program (a bit like the standard Windows Paint accessory) Using a delegate, you could allow the user to plug in special color filters or image analyzers Furthermore, the user could create a sequence of these filters or analyzers Such a scheme would be easily handled using a delegate

defined by the NET Framework The following program purposely generates such an exception and then catches it:

// Demonstrate exception handling using System; class ExcDemo1 { static void Main() { int[] nums = new int[4]; try { ConsoleWriteLine("Before exception is generated"); // Generate an index out-of-bounds exception for(int i=0; i < 10; i++) { nums[i] = i; ConsoleWriteLine("nums[{0}]: {1}", i, nums[i]); } ConsoleWriteLine("this won't be displayed"); } catch (IndexOutOfRangeException) { // Catch the exception ConsoleWriteLine("Index out-of-bounds!"); } ConsoleWriteLine("After catch block"); } }

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