IsError Function
Returns a Boolean value indicating whether an expression is an exception type.
Public Function IsError(ByVal Expression As Object) As Boolean
Parameters
- Expression
Required. Object expression.
Remarks
IsError returns True if the expression represents an Object variable that derives from the Exception class in the System namespace.
An exception that derives from System.Exception can be caught with the Try...Catch...Finally statements.
Example
The following example uses the IsError function to check if an expression represents a system exception.
Sub demonstrateIsError(ByVal firstArg As Integer)
Dim returnVal As New Object
Dim badArg As String = "Bad argument value"
Dim errorCheck As Boolean
If firstArg > 10000 Then
returnVal = New System.ArgumentOutOfRangeException(badArg)
End If
errorCheck = IsError(returnVal)
End Sub
Requirements
Namespace: Microsoft.VisualBasic
Module: Information
Assembly: Visual Basic Runtime Library (in Microsoft.VisualBasic.dll)
See Also
Reference
IsArray Function (Visual Basic)
IsDate Function (Visual Basic)