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Example A-45. One solution to Exercise 15-4 (continued)
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foreach (string subString in theRegex.Split(importantString)) { sBuilder.AppendFormat("{0}: {1}\n", id++, subString); } Console.WriteLine("{0}", sBuilder); } static void Main( ) { Tester t = new Tester( ); t.Run( ); } } }
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16: Throwing and Catching Exceptions
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Quiz Solutions
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Solution to Question 16-1. An exception is an object (derived from System.Exception) that contains information about a problematic event. The framework supports throwing exceptions to stop processing and catching events to handle the problem and resume processing. Solution to Question 16-2. The difference between a bug and an exception is that a bug is an error in programming, one that should be caught either by the compiler or in testing before you turn the program over to users. An exception is code that accounts for a situation that can t be avoided during coding, but can be predicted, such as a lost database connection. Solution to Question 16-3. To generate an exception, you use the throw keyword, although the system will generate some exceptions on its own. Solution to Question 16-4. To handle an exception, you wrap the code you think might generate the exception in a try block. The code to handle the exception goes in an associated catch block. Solution to Question 16-5. If no exception handler is found in the method that throws an event, the stack is unwound until a handler is found, or else the exception is handled by the CLR, which terminates the program. Solution to Question 16-6. After the handler s code is run, the program execution resumes with the code immediately following the handler (that is, after the catch block). Depending on where the handler is located in your code, and where the
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Appendix: Answers to Quizzes and Exercises
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exception is thrown, you may be unable to return to the method where the exception was generated. Solution to Question 16-7. The syntax for throwing a new ArgumentNull exception is:
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throw new Sytem.ArgumentNullException( );
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Solution to Question 16-8. You can write multiple exception handlers to handle different types of exceptions; the first handler that catches the thrown exception will prevent further handling. Beware of inheritance complications in the ordering of your handlers. Solution to Question 16-9. If you have code that must run whether or not an exception is thrown (to close a file, for example), place that code in the finally block. You must have a try before the finally, but a catch is optional. Solution to Question 16-10. You often won t need a custom exception class; C# provides many exception types for your needs. However, you may want to create a custom exception to define a situation that s unique to the design of your program, and would not be an error outside it.
Exercise Solutions
Solution to Exercise 16-1. Create a simple array of three integers. Ask the user which array element she wants to see. Output the integer that the user asked for (remember that the user probably won t ask for a zero-based index). Provide a way for the user to indicate whether she wants another integer, or to end the program. Provide a handler that deals with invalid input. This is a simple exercise, but the point is to create the error handler. Setting up the array is easy, as is asking the user for input. If you re keeping the user s requested index in a variable called theEntry, for example, remember to return theIntArray[theEntry - 1] to account for the fact that the user probably won t be thinking in terms of zero-based indexes. To allow the user to keep asking for integers until she gets bored, wrap the whole thing in a while loop with a simple Boolean for a control variable. Initialize the Boolean to true before you start the loop. Then, inside the loop, ask the user whether she wants to try again, and use another ReadLine( ) to get the response. If the response is "Y" (or "y" for safety), you leave the Boolean set to true and go around the loop again. If it s anything else, change the Boolean to false and terminate the program. None of that is the interesting part, though. Enclose the input line and the output for the selected index in a try block. Immediately after the try block, insert a generic catch block to output a message that the error is invalid. This catch block will handle
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