Structured Exception Handling in VB.net
By: Steven Holzner in VB.net Tutorials on 2010-11-17
Visual Basic also supports structured exception handling. In particular, Visual Basic uses an enhanced version of the Try-Catch-Finally syntax already supported by other languages, such as Java. Here's an example that follows our previous example handling a division by zero exception; I start by creating a Try block-you put the exception-prone code in the Try section and the exception-handling code in the Catch section:
Module Module1
Sub Main()
Try
⋮
Catch e As Exception
⋮
End Try
End Sub
End Module
Note the syntax of the Catch statement, which catches an Exception object that I'm naming e. When the code in the Try block causes an exception, I can use the e.ToString method to display a message:
Module Module1
Sub Main()
Dim int1 = 0, int2 = 1, int3 As Integer
Try
int3 = int2 / int1
System.Console.WriteLine("The answer is {0}", int3)
Catch e As Exception
System.Console.WriteLine(e.ToString)
End Try
End Sub
End Module
Here's what you see when you run this code:
System.OverflowException: Exception of type System.OverflowException was thrown. at Microsoft.VisualBasic.Helpers.IntegerType.FromObject(Object Value) at ConsoleHello.Module1.Main() in C:\vbnet\ConsoleHello\Module1.vb:line 5
Besides using the e.ToString method, you can also use the e.message field, which contains this message:
Exception of type System.OverflowException was thrown.
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