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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

// Use object to create a "generic" array using System; class GenericDemo { static void Main() { object[] ga = new object[10]; // Store ints for(int i=0; i < 3; i++) ga[i] = i; // Store doubles for(int i=3; i < 6; i++) ga[i] = (double) i / 2;

The verb is should consult The subject is I Given there is no other verb, and the verb is not a form of to be, the pronoun whom is correct

// Store two strings, a bool, and a char ga[6] = "Hello"; ga[7] = true; ga[8] = 'X'; ga[9] = "end"; for(int i = 0; i < gaLength; i++) ConsoleWriteLine("ga[" + i + "]: " + ga[i] + " "); } }

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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 } 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, there can be more than one catch clause 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 the block of code associated with that catch clause is executed (and all

Part I:

other catch clauses 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), then there is no need to specify exOb 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

The output from the program is shown here:

Value Value Value Value Value Value Value Value is: is: is: is: is: is: is: is: 0 1 2 3 4 5 6 7

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 occurs, the C# runtime system throws an IndexOutOfRangeException, which is a standard exception The following program purposely generates such an exception and then catches it:

Part I:

Value is: 8 Value is: 9 Summation: 45

// 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 nums[7] = 10; ConsoleWriteLine("this won't be displayed"); } catch (IndexOutOfRangeException) { // catch the exception ConsoleWriteLine("Index out-of-bounds!"); } ConsoleWriteLine("After catch block"); } }

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