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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
)
public static boolean IsError (
	Object Expression
)
public static function IsError (
	Expression : Object
) : boolean
Not applicable.

Parameters

Expression

Required. Object expression.

Return Value

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

For more detailed information, see the Visual Basic topic IsError Function.

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

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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