Declaração Throw (Visual Basic)

  • Artigo

Throws an exception within a procedure.

Throw [ expression ]

Part

  • expression
    Provides information about the exception to be thrown. Optional when residing in a Catch statement, otherwise required.

Comentários

The Throw statement throws an exception that you can handle with structured exception-handling code (Try...Catch...Finally) or unstructured exception-handling code (On Error GoTo). You can use the Throw statement to trap errors within your code because Visual Basic moves up the call stack until it finds the appropriate exception-handling code.

A Throw statement with no expression can only be used in a Catch statement, in which case the statement rethrows the exception currently being handled by the Catch statement.

The Throw statement resets the call stack for the expression exception. If expression is not provided, the call stack is left unchanged. You can access the call stack for the exception through the StackTrace property.

Exemplo

The following code uses the Throw statement to throw an exception:

' Throws a new exception.
Throw New System.Exception("An exception has occurred.")

Requisitos

Namespace: Microsoft. VisualBasic

Módulo: Interaction

Assembly: Visual Basic Runtime Library (in Microsoft.VisualBasic.dll)

Consulte também

Tarefas

Como: Verifique a exceção interna de uma exceção (Visual Basic)

Referência

Instrução Try...Catch...Finally (Visual Basic)

Instrução On Error (Visual Basic)

Conceitos

Visão Geral sobre a Manipulação Estruturada de Exceções para o Visual Basic

Visão geral (Visual Basic) de manipulação de exceção não estruturada