Queues - plugin which shows the count of items inside queue

I developed the plugin to make it possible to see near the name of queue the total count of items inside it. But it doesn't work for Assigned and In-Progress (personal queues).



The code of the plugin:

using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.Crm.Sdk;
using Microsoft.Crm.SdkTypeProxy;
using System.Xml;

namespace QueueHelper
{
    public class QHelper : IPlugin
    {

        #region IPlugin Members

        public void Execute(IPluginExecutionContext context)
        {
            if (context.MessageName == MessageName.RetrieveMultiple &&
                context.PrimaryEntityName == EntityName.queue.ToString())
            {
                BusinessEntityCollection queues = (BusinessEntityCollection)context.OutputParameters[ParameterName.BusinessEntityCollection];
                ICrmService crmservice = context.CreateCrmService(true);

                for (int i = 0; i < queues.BusinessEntities.Count; i++)
                {
                    DynamicEntity _queue = (DynamicEntity)queues.BusinessEntities[i];
                    if (!_queue.Properties.Contains("name"))
                        return;
                    
                    Guid queueid = ((Key)_queue["queueid"]).Value;

                    string fetchrequest = string.Format(
@"<fetch mapping='logical' aggregate='true'>
    <entity name='queueitem'>
        <attribute name='queueitemid' alias='c' aggregate='count'/>
        <filter type='and'>
            <condition attribute='objecttypecode' operator='ne' value='4406'/>
            <condition attribute='queueid' operator='eq' value='{0}'/>
        </filter>
    </entity>
</fetch>", queueid.ToString());

                    string fetchresult = crmservice.Fetch(fetchrequest);
                    XmlDocument document = new XmlDocument();
                    document.LoadXml(fetchresult);

                    _queue["name"] = string.Format("{0} - total length - {1} items", _queue["name"], document.SelectSingleNode("//resultset/result/c").InnerText);
                    queues.BusinessEntities[i] = _queue;
                }

                context.OutputParameters[ParameterName.BusinessEntityCollection] = queues;
            }
        }

        #endregion members
    }
}

The registration of plugin:



And the result of work:



Here you can download source code and built assembly: