Our custom code starts the workflow using classes in the Microsoft.SharePoint.WorkflowServices namespace but we can't seem to find a method to end the workflow.

Your help and time is greatly appreciated. Thank you. :)

3 Answers 3


I wouldn't use the server side OM (what you reference in your post), use the CSOM implementation as it's going to work both in an on-prem & Office 365 option. What you need to do is get a reference to the specific instance you want to work with.

You first need a reference to the instance service and then pass in the ID of the list & list item to see all instances, like this:

// connect to the workflow services via a CSOM client context
var clientContext = new ClientContext(siteCollectionUrl);
var workflowServicesManager = new WorkflowServicesManager(clientContext, clientContext.Web);

// connect to the instance service
var workflowInstanceService = workflowServicesManager.GetWorkflowInstanceService();

// get all instances
var workflowInstances = workflowInstanceService.EnumerateInstancesForListItem(listId, listItemId);

From there, you can enumerate each of them and find the one you want to suspend or terminate:

foreach (var instance in workflowInstances)
  // is this what we are looking for?
  // ...

  // if so, suspend it

  // or you can terminate it
  • Hi Andrew, sorry I missed this reply previously. Thank you very much!!
    – Celbester
    Oct 30, 2013 at 13:28

I can remember that I did it some time before (where were possibilities not only to cancel workflow, but also to suspend and resume), but I could not find my solution for a while. If it is not so urgent, I can try to find some time tomorrow to do that again.

  • Hi Mikhail, yes please. Or actually even just online references (if any) will be of big help already. Batiste at social.msdn.microsoft.com/Forums/en-US/sharepointdevelopment/… has suggested looking at the WorkflowInstanceService class.
    – Celbester
    May 29, 2013 at 13:45
  • Hi Celbester. I had a lot of work and have completely forgotten that wanted to help you. Sorry for that! Is the question still actual?
    – MikhailSP
    Jun 13, 2013 at 13:39

A second way is to use the workflow client via this blog post:


  • 1
    Can you please extend your answer with more details, if the link breaks your answer will not be very useful right now :) Dec 4, 2013 at 18:17

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