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Write-Error

Updated: April 21, 2010

Applies To: Windows PowerShell 2.0

Writes an object to the error stream.

Syntax

Write-Error -ErrorRecord <ErrorRecord> [-CategoryActivity <string>] [-CategoryReason <string>] [-CategoryTargetName <string>] [-CategoryTargetType <string>] [-RecommendedAction <string>] [<CommonParameters>]

Write-Error [-Message] <string> [-Category {<NotSpecified> | <OpenError> | <CloseError> | <DeviceError> | <DeadlockDetected> | <InvalidArgument> | <InvalidData> | <InvalidOperation> | <InvalidResult> | <InvalidType> | <MetadataError> | <NotImplemented> | <NotInstalled> | <ObjectNotFound> | <OperationStopped> | <OperationTimeout> | <SyntaxError> | <ParserError> | <PermissionDenied> | <ResourceBusy> | <ResourceExists> | <ResourceUnavailable> | <ReadError> | <WriteError> | <FromStdErr> | <SecurityError>}] [-ErrorId <string>] [-TargetObject <Object>] [-CategoryActivity <string>] [-CategoryReason <string>] [-CategoryTargetName <string>] [-CategoryTargetType <string>] [-RecommendedAction <string>] [<CommonParameters>]

Write-Error -Exception <Exception> [-Category {<NotSpecified> | <OpenError> | <CloseError> | <DeviceError> | <DeadlockDetected> | <InvalidArgument> | <InvalidData> | <InvalidOperation> | <InvalidResult> | <InvalidType> | <MetadataError> | <NotImplemented> | <NotInstalled> | <ObjectNotFound> | <OperationStopped> | <OperationTimeout> | <SyntaxError> | <ParserError> | <PermissionDenied> | <ResourceBusy> | <ResourceExists> | <ResourceUnavailable> | <ReadError> | <WriteError> | <FromStdErr> | <SecurityError>}] [-ErrorId <string>] [-Message <string>] [-TargetObject <Object>] [-CategoryActivity <string>] [-CategoryReason <string>] [-CategoryTargetName <string>] [-CategoryTargetType <string>] [-RecommendedAction <string>] [<CommonParameters>]

Description

The Write-Error cmdlet writes an error to the Windows PowerShell error stream. By default, errors are sent to the host program to be displayed, along with output.

You can write an error by submitting an error message string, an ErrorRecord object, or an Exception object. Use the other parameters of Write-Error to populate the error record.

Parameters

-Category <ErrorCategory>

Specifies the category of the error. The default value is NotSpecified.

For information about the error categories, see "ErrorCategory Enumeration" in the MSDN (Microsoft Developer Network) library at http://go.microsoft.com/fwlink/?LinkId=143600.

 

Required?

false

Position?

named

Default Value

NotSpecified

Accept Pipeline Input?

false

Accept Wildcard Characters?

false

-CategoryActivity <string>

Describes the action that caused the error.

 

Required?

false

Position?

named

Default Value

None

Accept Pipeline Input?

false

Accept Wildcard Characters?

false

-CategoryReason <string>

Explains how or why the activity caused the error.

 

Required?

false

Position?

named

Default Value

None

Accept Pipeline Input?

false

Accept Wildcard Characters?

false

-CategoryTargetName <string>

Specifies the name of the object that was being processed when the error occurred.

 

Required?

false

Position?

named

Default Value

None

Accept Pipeline Input?

false

Accept Wildcard Characters?

false

-CategoryTargetType <string>

Specifies the .NET type of the object that was being processed when the error occurred.

 

Required?

false

Position?

named

Default Value

None

Accept Pipeline Input?

false

Accept Wildcard Characters?

false

-ErrorId <string>

Specifies an ID string to identify the error. The string should be unique to the error.

 

Required?

false

Position?

named

Default Value

None

Accept Pipeline Input?

false

Accept Wildcard Characters?

false

-ErrorRecord <ErrorRecord>

Specifies an error record object that includes properties that describe the error.

To get an error record object, use the New-Object cmdlet or take an error record object from the array in the $Error automatic variable.

 

Required?

true

Position?

named

Default Value

None

Accept Pipeline Input?

false

Accept Wildcard Characters?

false

-Exception <Exception>

Specifies an exception that represents the error.

You can use an exception instead of specifying message text or an exception record.

 

Required?

true

Position?

named

Default Value

None

Accept Pipeline Input?

false

Accept Wildcard Characters?

false

-Message <string>

Specifies the message text of the error. If the text includes spaces or special characters, enclose it in quotation marks. You can also pipe a message string to Write-Error.

 

Required?

true

Position?

1

Default Value

None

Accept Pipeline Input?

true (ByValue)

Accept Wildcard Characters?

false

-RecommendedAction <string>

Describes the action that the user should take to resolve or prevent the error.

 

Required?

false

Position?

named

Default Value

None

Accept Pipeline Input?

false

Accept Wildcard Characters?

false

-TargetObject <Object>

Specifies the object that was being processed when the error occurred. Enter the object (such as a string), a variable that contains the object, or a command that gets the object.

 

Required?

false

Position?

named

Default Value

None

Accept Pipeline Input?

false

Accept Wildcard Characters?

false

<CommonParameters>

This command supports the common parameters: Verbose, Debug, ErrorAction, ErrorVariable, OutBuffer, OutVariable, WarningAction, and WarningVariable. For more information, see about_CommonParameters.

Inputs and Outputs

The input type is the type of the objects that you can pipe to the cmdlet. The return type is the type of the objects that the cmdlet returns.

 

Inputs

System.String

You can pipe a string that contains an error message to Write-Error.

Outputs

Error object

Write-Error writes only to the error stream. It does not return any objects.

Example 1

C:\PS>get-childitem | foreach-object { if ($_.gettype().tostring() -eq "Microsoft.Win32.RegistryKey") {write-error "Out-of-band object" -errorID B1 -targetobject $_ } else {$_ } }

Description

-----------

This command writes an error when the Get-ChildItem cmdlet returns a Microsoft.Win32.RegistryKey object, such as the objects in the HKLM: or HKCU drives of the Windows PowerShell Registry provider.

Example 2

C:\PS>write-error  "Access denied."

Description

-----------

This command writes an "Access denied" error. The command uses the Message parameter to specify the message, but omits the optional Message parameter name.

Example 3

C:\PS>write-error -message "Error: Too many input values." -category InvalidArgument

Description

-----------

This command writes a error and specifies an error category.

See Also

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