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Information.IsError Method

Returns a Boolean value indicating whether an expression is an exception type.

Namespace:  Microsoft.VisualBasic
Assembly:  Microsoft.VisualBasic (in Microsoft.VisualBasic.dll)

public static bool IsError(
	Object Expression
)

Parameters

Expression
Type: System.Object
Required. Object expression.

Return Value

Type: System.Boolean
Returns a Boolean value indicating whether an expression is an exception type.

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.

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


Silverlight

Supported in: 5, 4, 3

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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