Windows Phoneのアプリとバックグラウンドタスクでデータを共有するためのクラス

MutexedIsoStorageFile.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.IO.IsolatedStorage;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Xml.Serialization;

namespace Chatwork.Service.Shared
{
    public class MyStatus
    {
        public string Token { get; set; }
        public int Unread { get; set; }
        public int Mention { get; set; }
        public int MyTask { get; set; }
    }
    public static class MutexedIsoStorageFile
    {
        private const String IsoStorageDateFile = "Chatwork.Service.WP.My.xml";

        public static MyStatus Read()
        {
            var mutex = new Mutex(false, "Chatwork.Service.WP");
            mutex.WaitOne();

            try
            {
                using (var store = IsolatedStorageFile.GetUserStoreForApplication())
                using (var stream = new IsolatedStorageFileStream(IsoStorageDateFile, FileMode.OpenOrCreate, FileAccess.Read, store))
                using (var reader = new StreamReader(stream))
                {
                    var serializer = new XmlSerializer(typeof(MyStatus));
                    var status = (MyStatus)serializer.Deserialize(reader);
                    return status;
                }
            }
            finally
            {
                mutex.ReleaseMutex();
            }
        }

        public static void Write(MyStatus data)
        {
            var mutex = new Mutex(false, "Chatwork.Service.WP");
            mutex.WaitOne();

            try
            {
                using (var store = IsolatedStorageFile.GetUserStoreForApplication())
                using (var stream = new IsolatedStorageFileStream(IsoStorageDateFile,
                                                                  FileMode.Create,
                                                                  FileAccess.Write,
                                                                  store))
                {
                    var serializer = new XmlSerializer(typeof(MyStatus));
                    serializer.Serialize(stream, data);
                }
            }
            finally
            {
                mutex.ReleaseMutex();
            }
        }

    }
}