How to get "AutoCleanupDays" property of workflow in SharePoint 2013

Question

I'm trying to get "AutoCleaupDays" property of workflow association but workflowassociation always returning null. Then I tried with workflowSubscriptionService & here I am getting my workflow but it does not expose "AutoCleaupDays" property. below is my code

CODE 1: Using SPList.WorkflowAssociations

SPList list = web.Lists.TryGetList("IT-Request-Form");
SPWorkflowAssociationCollection WAC = list.WorkflowAssociations;//Its returing null
System.Globalization.CultureInfo culinfo = new System.Globalization.CultureInfo("en-us");
SPWorkflowAssociation WA = WAC.GetAssociationByName("WorkflowAssociation_5fb922d2693c4b718c652ce7d5eb49ce", culinfo);
int days = WA.AutoCleanupDays;

SPWorkflowAssociationCollection returning null.

CODE 2: Using GetWorkflowSubscriptionService

var workflowServiceManager = new WorkflowServicesManager(web);
var workflowSubscriptionService = workflowServiceManager.GetWorkflowSubscriptionService();
var subscriptions = workflowSubscriptionService.EnumerateSubscriptionsByList(list.ID);
foreach (var workflowSubscription in subscriptions)
{
 //here i get "Object reference not set to an instance of an object" exception
 string autoCleanupDays = workflowSubscription.GetProperty("AutoCleanupDays").ToString();

 //Then i checked Properties & allProperties does not contains "AutoCleanupDays" Property
 ICollection<string> allProperties  = workflowSubscription.PropertyDefinitions.Keys;

}

So how I get "AutoCleaupDays" value of workflow in SP2013?

Answer 1

I replied your post: Does Completed workflow instances automatically cleaned up after 30 days in sharepoint 2013?

I provided how to set AutoCleanupDays property using PowerShell.