linux-packaging-mono/mcs/class/referencesource/System.Workflow.Runtime/Hosting/WorkflowSchedulerService.cs

using System;
using System.Threading;

namespace System.Workflow.Runtime.Hosting
{
    [Obsolete("The System.Workflow.* types are deprecated.  Instead, please use the new types from System.Activities.*")]
    public abstract class WorkflowSchedulerService : WorkflowRuntimeService
    {
        internal protected abstract void Schedule(WaitCallback callback, Guid workflowInstanceId);
        internal protected abstract void Schedule(WaitCallback callback, Guid workflowInstanceId, DateTime whenUtc, Guid timerId);
        internal protected abstract void Cancel(Guid timerId);
    }
}