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ConsoleWriteLine("After catch block"); } }
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The output is shown here:
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Before exception is generated nums[0]: 0 nums[1]: 1 nums[2]: 2 nums[3]: 3 Unhandled Exception: SystemIndexOutOfRangeException: Index was outside the bounds of the array at ExcTypeMismatchMain()
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As the output demonstrates, a catch for DivideByZeroException won t catch an IndexOutOfRangeException
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Exceptions Let You Handle Errors Gracefully
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One of the key benefits of exception handling is that it enables your program to respond to an error and then continue running For example, consider the following example that divides the elements of one array by the elements of another If a division-by-zero occurs, a DivideByZeroException is generated In the program, this exception is handled by reporting the error and then continuing with execution Thus, attempting to divide by zero does not cause an abrupt runtime error resulting in the termination of the program Instead, it is handled gracefully, allowing program execution to continue
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// Handle error gracefully and continue using System; class ExcDemo3 { static void Main() { int[] numer = { 4, 8, 16, 32, 64, 128 }; int[] denom = { 2, 0, 4, 4, 0, 8 }; for(int i=0; i < numerLength; i++) { try { ConsoleWriteLine(numer[i] + " / " + denom[i] + " is " + numer[i]/denom[i]); } catch (DivideByZeroException) { // Catch the exception ConsoleWriteLine("Can't divide by Zero!"); } } } }
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The C# Language
The output from the program is shown here:
4 / 2 is 2 Can't divide by Zero! 16 / 4 is 4 32 / 4 is 8 Can't divide by Zero! 128 / 8 is 16
This example makes another important point: Once an exception has been handled, it is removed from the system Therefore, in the program, each pass through the loop enters the try block anew any prior exceptions have been handled This enables your program to handle repeated errors
Using Multiple catch Clauses
You can associate more than one catch clause with a try In fact, it is common to do so However, each catch must catch a different type of exception For example, the program shown here catches both array boundary and divide-by-zero errors:
// Use multiple catch clauses using System; class ExcDemo4 { static void Main() { // Here, numer is longer than denom int[] numer = { 4, 8, 16, 32, 64, 128, 256, 512 }; int[] denom = { 2, 0, 4, 4, 0, 8 }; for(int i=0; i < numerLength; i++) { try { ConsoleWriteLine(numer[i] + " / " + denom[i] + " is " + numer[i]/denom[i]); } catch (DivideByZeroException) { ConsoleWriteLine("Can't divide by Zero!"); } catch (IndexOutOfRangeException) { ConsoleWriteLine("No matching element found"); } } } }
This program produces the following output:
4 / 2 is 2 Can't divide by Zero! 16 / 4 is 4 32 / 4 is 8 Can't divide by Zero! 128 / 8 is 16
13:
Exception Handling
No matching element found No matching element found
As the output confirms, each catch clause responds only to its own type of exception In general, catch clauses are checked in the order in which they occur in a program Only the first matching clause is executed All other catch blocks are ignored
PART I
Catching All Exceptions
Occasionally, you might want to catch all exceptions, no matter the type To do this, use a catch clause that specifies no exception type or variable It has this general form: catch { // handle exceptions } This creates a catch all handler that ensures that all exceptions are caught by your program Here is an example of a catch all exception handler Notice that it catches both the IndexOutOfRangeException and the DivideByZeroException generated by the program:
// Use the "catch all" catch using System; class ExcDemo5 { static void Main() { // Here, numer is longer than denom int[] numer = { 4, 8, 16, 32, 64, 128, 256, 512 }; int[] denom = { 2, 0, 4, 4, 0, 8 }; for(int i=0; i < numerLength; i++) { try { ConsoleWriteLine(numer[i] + " / " + denom[i] + " is " + numer[i]/denom[i]); } catch { // A "catch-all" catch ConsoleWriteLine("Some exception occurred"); } } } }
The output is shown here:
4 / 2 is 2 Some exception 16 / 4 is 4 32 / 4 is 8 Some exception 128 / 8 is 16 Some exception Some exception occurred
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