barcode with vb.net Attempt to index beyond nums boundary Catch the exception in C#.NET

Maker ANSI/AIM Code 128 in C#.NET Attempt to index beyond nums boundary Catch the exception

Attempt to index beyond nums boundary Catch the exception
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This program displays the following output:
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Before exception is generated Index out-of-bounds! After catch block
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Although quite short, the preceding program illustrates several key points about exception handling First, the code that you want to monitor for errors is contained within a try block Second, when an exception occurs (in this case, because of the attempt to index nums beyond its bounds), the exception is thrown out of the try block and caught by the catch At this point, control passes to the catch block, and the try block is terminated That is, catch is not called
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10: Exception Handling
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Rather, program execution is transferred to it Thus, the WriteLine( ) statement following the out-of-bounds index will never execute After the catch block executes, program control continues with the statements following the catch Thus, it is the job of your exception handler to remedy the problem that caused the exception so that program execution can continue normally Notice that no exception variable name is specified in the catch clause Instead, only the type of the exception (IndexOutOfRangeException in this case) is required As mentioned, an exception variable is needed only when access to the exception object is required In some cases, the value of the exception object can be used by the exception handler to obtain additional information about the error, but in many cases, it is sufficient to simply know that an exception occurred Thus, it is not unusual for the catch exception variable to be absent, as is the case in the preceding program As explained, if no exception is thrown by a try block, then no catch will be executed and program control resumes after the catch To confirm this, in the preceding program, change the line
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nums[7] = 10;
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nums[0] = 10;
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Now, no exception is generated and the catch block is not executed
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A Second Exception Example
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It is important to understand that all code within a try block is monitored for exceptions This includes exceptions that might be generated by a method called from within the try block An exception thrown by a method called from within a try block can be caught by that try block assuming, of course, that the method itself did not catch the exception For example, this is a valid program:
// An exception can be generated by one method and caught by another using System; class ExcTest { // Generate an exception public static void GenException() { int[] nums = new int[4]; ConsoleWriteLine("Before exception is generated"); // Generate an index out-of-bounds exception nums[7] = 10; ConsoleWriteLine("this won't be displayed"); } }
Exception generated here
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class ExcDemo2 { static void Main() { try { ExcTestGenException(); } catch (IndexOutOfRangeException) { // Catch the exception ConsoleWriteLine("Index out-of-bounds!"); } ConsoleWriteLine("After catch block"); } }
Exception caught here
This program produces the following output, which is the same as that produced by the first version of the program shown earlier:
Before exception is generated Index out-of-bounds! After catch block
Since GenException( ) is called from within a try block, the exception that it generates (and does not catch) is caught by the catch in Main( ) Understand, however, that if GenException( ) had caught the exception, it never would have been passed back to Main( )
The Consequences of an Uncaught Exception
Catching one of C# s standard exceptions, as the preceding program does, has a side benefit: It prevents abnormal program termination When an exception is thrown, it must be caught by some piece of code somewhere In general, if your program does not catch an exception, then it will be caught by the runtime system The trouble is that the runtime system will report an error and terminate the program For example, in this version of the preceding example, the index out-of-bounds exception is not caught by the program:
// Let the runtime system handle the error using System; class NotHandled { static void Main() { int[] nums = new int[4]; ConsoleWriteLine("Before exception is generated"); // Generate an index out-of-bounds exception nums[7] = 10; } }
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