Get all Suspended or Terminated Workflow instances in SharePoint Online

WFInstances.cs

using Microsoft.SharePoint.Client;
using Microsoft.SharePoint.Client.WorkflowServices;
using System;
using System.Linq;
using System.Security;

namespace WFExplorer
{
    class Program
    {
        static void Main(string[] args)
        {
            string siteUrl = "https://tenant.sharepoint.com/sites/intranet";
            string userName = "admin@tenant.onmicrosoft.com";
            string password = "adminpassword";
            string listTitle = "MyList";
            string workflowName = "MyWorkflow";
            var workflowStatus = WorkflowStatus.Suspended; // WorkflowStatus.Terminated or any value from the WorkflowStatus enumeration.

            var clientContext = GetClientContext(siteUrl, userName, password);
            Web web = clientContext.Web;
            Guid listGUID= GetListGUID(clientContext, listTitle);

            //Get the workflow subscription (workflow definition)
            var wfServicesManager = new WorkflowServicesManager(clientContext, web);
            var wfSubscriptionService = wfServicesManager.GetWorkflowSubscriptionService();
            var wfSubscriptions = wfSubscriptionService.EnumerateSubscriptionsByList(listGUID);
            clientContext.Load(wfSubscriptions, wfSubs => wfSubs.Where(wfSub => wfSub.Name == workflowName));
            clientContext.ExecuteQuery();
            var wfSubscription = wfSubscriptions.First();

            //Get the workflow instances
            var wfInstanceService = wfServicesManager.GetWorkflowInstanceService();
            var wfInstanceCollection = wfInstanceService.Enumerate(wfSubscription);
            clientContext.Load(wfInstanceCollection, wfInstances => wfInstances.Where(wfI => wfI.Status == workflowStatus));
            clientContext.ExecuteQuery();

            //List all instances with the selected status. 
            foreach (var wfInstance in wfInstanceCollection)
            {
                Console.WriteLine(wfInstance.Properties["Microsoft.SharePoint.ActivationProperties.CurrentItemUrl"]);
            }

            Console.ReadKey();
        }

        private static ClientContext GetClientContext(string siteUrl, string userName, string password)
        {
            ClientContext clientContext = new ClientContext(siteUrl);
            var securePassword = new SecureString();
            foreach (char c in password.ToCharArray()) securePassword.AppendChar(c);
            clientContext.Credentials = new SharePointOnlineCredentials(userName, securePassword);
            return clientContext;
        }

        private static Guid GetListGUID(ClientContext context, string listTitle)
        {
            var list = context.Web.Lists.GetByTitle(listTitle);
            context.Load(list, l => l.Id);
            context.ExecuteQuery();
            return list.Id;
        }
    }
}