Powershell Custom Cmdlet - Call WriteObject in Background Thread

Question

Calling the WriteObject Method from a background thread is not possible!

Is there a possibility, to invoke/dispatch this method in the main thread of the powershell (like in WPF)?

Code sample:

protected override void ProcessRecord()
{
    base.ProcessRecord();
    ...
    Service.StartReading(filter, list => { WriteObject(list, true); } );
}

EDIT: The error, which occured after calling the WriteObject method from the thread

Any solution, workaround or quick fix?

thx, Mathias

The standard System.Console.Out.WriteLine() method works great, but i need to pipe those result objects! — SpecialHias
– SpecialHias, Commented Jun 25, 2012 at 6:45

SpecialHias · Accepted Answer · 2014-05-01 08:54:06Z

2

I found a solution, which solves my problem.

created a ConcurrentQueue

ConcurrentQueue<LogEntryInfoBase> logEntryQueue = 
        new ConcurrentQueue<LogEntryInfoBase>();

start a background thread to enqueue items to the ConcurrentQueue

Task.Factory.StartNew(() => Service.StartReading(
        filter, EnqueueLogEntryInfoBases));

meanwhile, try to dequeue from this queue in the main thread

for ( ; ; )
{
    LogEntryInfoBase logEntry = null;
    logEntryQueue.TryDequeue(out logEntry);
    if (logEntry != null)
    {
        WriteObject(logEntry);
    }
    Thread.Sleep(100);
}

From my point of view, this solution/fix is ugly, but it works for my current issue.

edited May 1, 2014 at 8:54

answered Jun 29, 2012 at 8:09

SpecialHias

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Comments

James Dunn · Accepted Answer · 2014-04-29 18:42:11Z

0

I was stuck on pretty much the same issue. In my opinion we can improve the solution by adding a sleep in the infinite loop. Of course we will need to have a global reference to our main thread and the background thread will need to call interrupt as soon as an item is added in queue.

edited Apr 29, 2014 at 18:42

James Dunn

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answered Apr 29, 2014 at 17:54

iamtheone

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1 Comment

honk Over a year ago

This answer should be a comment of the answer by SpecialHias, because it is not an answer to the OP's question.

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