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Dim x, y, z, res As Integer All variables are 0. Try You can see different behaviors by commenting out or changing the order of the following statements. ... res = y \ x ... res = x \ y ... res = x \ z Catch ex As DivideByZeroException When (x = 0) Console.WriteLine( Division error: x is 0. ) Catch ex As DivideByZeroException When (y = 0) Console.WriteLine( Division error: y is 0. ) Catch ex As DivideByZeroException Console.WriteLine( Division error: no information on variables ) Catch ex As Exception Console.WriteLine( An error has occurred. ) End Try

In general, you can achieve the same behavior using an If ElseIf block inside a Catch block, but the When clause makes for better organization of your error handling code. For example, if no combination of Catch and When clauses matches the current excep tion, execution flow will go to the last Catch block and you don t have to duplicate any code whatsoever. The When clause can also reference the exception object s properties, so you can par tition your exceptions in subcategories and have a distinct Catch block for each one of them. For example, the following code parses the Message property to extract the name of the file that hasn t been found:

15. In the Apply a color scheme list, click Harbor. 16. Display page 2, and then click Now, let s party!

Try Comment out next statement to see the behavior when another file is missing. FileOpen(1, c:\myapp.ini", OpenMode.Input) FileOpen(2, c:\xxxxx.dat", OpenMode.Input) Catch ex As System.IO.FileNotFoundException _ When InStr(ex.Message, ""c:\myapp.ini"" ) > 0 The ini file is missing. Console.WriteLine( Can t initialize: MyApp.Ini file not found )

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resources for th s chapter s a brand-new, empty project that has the GameServicesComponent oaded You can use t to create a new profi e for yourse f

Catch ex As System.IO.FileNotFoundException Another file is missing. Extract the filename from the Message property. Dim filename As String = Split(ex.Message, "" )(1) Console.WriteLine( The following file is missing: & filename) End Try

An explanation is in order: The Message property of the FileNotFoundException object returns a string in the following format:

Therefore, you can use the InStr function to test whether a file you re looking for is embed ded in this string. Just remember to enclose the searched-for filename in double quotes. You can take advantage of the When keyword in other ways as well. For example, you might have a local variable that tracks the progress status of the procedure so that you can take different actions depending on where the error occurred. The following code should render the idea:

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Dim currentStep As Integer You can also use an Enum value. Try CurrentStep = 1 Initialize the program. currentStep = 2 Open the data file. currentStep = 3 Process the file s contents. currentStep = 4 ...And so on ... Catch ex As Exception When currentStep = 1 Console.WriteLine( An error occurred in the initialization step. ) Catch ex As System.IO.FileNotFoundException When currentStep = 2 Console.WriteLine( The data file wasn t found. ) Catch ex As Exception When currentStep = 2 Console.WriteLine( An error occurred while opening the data file. ) Catch ex As Exception When currentStep = 3 Console.WriteLine( An error occurred while processing data. ) Add here other Catch blocks. End Try

Note that it s acceptable to have the first block catch the generic Exception object because the When condition makes the test succeed only if the error occurred in the first (initialization) step of the procedure. When sorting Catch blocks related to the same step, you should catch more specific exception objects first (as when currentStep is 2 in the preceding code). You can also use the When keyword in a rather unorthodox way to solve one of the recurring problems in error logging and reporting. Let s say that you want to create a log of all the exceptions in your application, including those that are caught in a Catch clause. Apparently, the best solution is to create a generic error log routine and invoke it from inside each and every Catch block in your code, a boring and error-prone task.

Reliable Messages are guaranteed to arrive, but they are not guaranteed to arrive in the same order they were sent. ReliableInOrder Messages are guaranteed to arrive, and they will be in the same order they were sent.

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