Microsoft Windows Workflow Foundation

using System;
using System.Collections.Generic;
using System.Text;
using System.Workflow.Activities;
using System.Workflow.Runtime;
using System.Data;

namespace MVDataService
{
    public sealed class MVDataConnector : IMVDataService 
    {
        private DataSet _dataValue = null;
        private static WorkflowMVDataService _service = null;
        private static object _syncLock = new object();

        public static WorkflowMVDataService MVDataService
        {
            get { return _service; }
            set
            {
                if (value != null)
                {
                    lock (_syncLock)
                    {
                        // Re-verify the service isn't null
                        // now that we're locked...
                        if (value != null)
                        {
                            _service = value;
                        } // if
                        else
                        {
                            throw new InvalidOperationException("You must provide a service instance.");
                        } // else
                    } // lock
                } // if
                else
                {
                    throw new InvalidOperationException("You must provide a service instance.");
                } // else
            }
        }

        public DataSet MVData
        {
            get { return _dataValue; }
        }

        // Workflow to host communication method
        public void MVDataUpdate(DataSet mvData)
        {
            // Assign the field for later recall
            _dataValue = mvData;

            // Raise the event to trigger host read
            _service.RaiseMVDataUpdateEvent();
        }
    }
}