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Cmdlet.WriteObject Method (Object)


Updated: April 27, 2016

Applies To: Windows PowerShell

Writes a single object to the output pipeline.

Namespace:   System.Management.Automation
Assembly:  System.Management.Automation (in System.Management.Automation.dll)

Public Sub WriteObject (
	sendToPipeline As Object


Type: System.Object

The object to be written to the output pipeline.

Exception Condition

The pipeline is stopped. The pipeline was terminated either before the call was made or while the call was in progress. By default, the cmdlet should allow the caller of the processing record method to catch this exception.


The call cannot be completed at this time or cannot be completed from this thread. For more information, see the following Remarks section.

This method can be called only from within the implementation of an input processing method (BeginProcessing, ProcessRecord, and EndProcessing) and only from that thread. If the call is made from outside these implementations or from another thread, an InvalidOperationException exception is thrown.

This method sends a single object to the pipeline, regardless of whether the object is or is not a collection. To send a collection that is then enumerated by Windows PowerShell, see the Cmdlet.WriteObject method.

Cmdlets can also write to the debug, error, progress, warning, and verbose data streams by using the following methods:

For more information about cmdlets, see Cmdlet Overview.

The WriteObject method is used throughout a number of cmdlet code samples. The following sample, taken from the Modulecmdlets sample in the PowerShell SDK, uses WriteObject to pass a string down the pipeline.

public class TestBinaryModuleCmdlet3Command : Cmdlet
    protected override void BeginProcessing()
        WriteObject("BinaryModuleCmdlet3 exported by the ModuleCmdlets module.");
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