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Exception Trapping (VB.Net and Delphi Prism Cross Reference Guide)

By Mike Prestwood

VB.Net versus Delphi Prism: A side by side comparison between VB.Net and Delphi Prism.

Statements

Common statements such as if statements, loops, etc.

Exception Trapping

[Other Languages]

Languages Focus

A common usage of exception handling is to obtain and use resources in a "try-it" block, deal with any exceptions in an "exceptions" block, and release the resources in some kind of "final" block which executes whether or not any exceptions are trapped.

VB.Net: Try...Catch...Finally

VB.Net uses a try...catch...finally statement to trap for errors.

Try
Catch
Finally
End Try

Syntax Example:

Try
  Dim y As Integer = 0
  y = 1 / y
Catch
  MessageBox.Show("you cannot divide by zero")

End Try

VB.Net Exception Trapping (Try...Catch...Finally) 1 certification question.

Delphi Prism: try..except, try..finally

Use a try..except..end block to trap and process errors.

Delphi also offers a try...finally where code will execute in the finally section no matter what. It's common to put a try..except inside a try..finally.

Syntax Example:

try
  var y: Integer;
  y := 0;
  y := 1/y;
except
  MessageBox.Show("You cannot divide by zero.");
end;