public class SendEmailsTask : ScheduledTaskTemplate

using System;

namespace DNTScheduler.TestWebApplication.WebTasks
{
    public class SendEmailsTask : ScheduledTaskTemplate
    {
        /// <summary>
        /// اگر چند جاب در یک زمان مشخص داشتید، این خاصیت ترتیب اجرای آن‌ها را مشخص خواهد کرد
        /// </summary>
        public override int Order
        {
            get { return 1; }
        }

        public override bool RunAt(DateTime utcNow)
        {
            if (this.IsShuttingDown || this.Pause)
                return false;

            var now = utcNow.AddHours(3.5);
            return now.Minute % 2 == 0 && now.Second == 1;
        }

        public override void Run()
        {
            if (this.IsShuttingDown || this.Pause)
                return;

            System.Diagnostics.Trace.WriteLine("Running Send Emails");
        }

        public override string Name
        {
            get { return "ارسال ایمیل"; }
        }
    }
}

        public override bool RunAt(DateTime utcNow)
        {
            if (this.IsShuttingDown || this.Pause)
                return false;

            var now = utcNow.AddHours(3.5);
            return now.Hour == 23 && now.Minute == 33 && now.Second == 1;
        }

using System;
using System.Net;

namespace DNTScheduler.TestWebApplication.WebTasks
{
    public static class ScheduledTasksRegistry
    {
        public static void Init()
        {
            ScheduledTasksCoordinator.Current.AddScheduledTasks(
                new SendEmailsTask(),
                new DoBackupTask());

            ScheduledTasksCoordinator.Current.OnUnexpectedException = (exception, scheduledTask) =>
            {
                //todo: log the exception.
                System.Diagnostics.Trace.WriteLine(scheduledTask.Name + ":" + exception.Message);
            };

            ScheduledTasksCoordinator.Current.Start();
        }

        public static void End()
        {
            ScheduledTasksCoordinator.Current.Dispose();
        }

        public static void WakeUp(string pageUrl)
        {
            try
            {
                using (var client = new WebClient())
                {
                    client.Credentials = CredentialCache.DefaultNetworkCredentials;
                    client.Headers.Add("User-Agent", "ScheduledTasks 1.0");
                    client.DownloadData(pageUrl);
                }
            }
            catch (Exception ex)
            {
                //todo: log ex
                System.Diagnostics.Trace.WriteLine(ex.Message);
            }
        }
    }
}

using System;
using System.Configuration;
using DNTScheduler.TestWebApplication.WebTasks;

namespace DNTScheduler.TestWebApplication
{
    public class Global : System.Web.HttpApplication
    {
        protected void Application_Start(object sender, EventArgs e)
        {
            ScheduledTasksRegistry.Init();
        }

        protected void Application_End()
        {
            ScheduledTasksRegistry.End();
            //نکته مهم این روش نیاز به سرویس پینگ سایت برای زنده نگه داشتن آن است
            ScheduledTasksRegistry.WakeUp(ConfigurationManager.AppSettings["SiteRootUrl"]);
        }
    }
}

 <?xml version="1.0"?>
<configuration>
  <appSettings>
      <add key="SiteRootUrl" value="http://localhost:10189/Default.aspx" />
  </appSettings>
</configuration>

var jobsList = ScheduledTasksCoordinator.Current.ScheduledTasks.Select(x => new
{
   TaskName = x.Name,
   LastRunTime = x.LastRun,
   LastRunWasSuccessful = x.IsLastRunSuccessful,
   IsPaused = x.Pause,
}).ToList();

<CustomControls:FrameFactory
                    x:Name="ActiveScreen"            
                    HorizontalContentAlignment="Stretch"
                    VerticalContentAlignment="Stretch"     
                    NavigationUIVisibility="Hidden"            
                    Grid.Column="1" 
                    Margin="0" />

/// <summary>
/// تغییر مشخصات کاربر جاری
/// </summary>
[PageAuthorization(AuthorizationType.FreeForAuthenticatedUsers)]
public partial class ChangeProfile

                <Button Style="{DynamicResource MetroCircleButtonStyle}"
                        Height="55" Width="55"  
                        Command="{Binding DoNavigate}"
                        CommandParameter="\Views\UserInfo\ChangeProfile.xaml"
                        Margin="2">
                    <Rectangle Width="28" Height="17.25">
                        <Rectangle.Fill>
                            <VisualBrush Stretch="Fill" Visual="{StaticResource appbar_user_tie}" />
                        </Rectangle.Fill>
                    </Rectangle>
                </Button>

 public abstract class BaseViewModel : DataErrorInfoBase, INotifyPropertyChanged, IViewModel

using System.Data.Entity.ModelConfiguration;
 
namespace MvcPluginMasterApp.Plugin1.DomainClasses
{
    public class News
    {
        public int Id { set; get; }
 
        public string Title { set; get; }
 
        public string Body { set; get; }
    }
 
    public class NewsConfig : EntityTypeConfiguration<News>
    {
        public NewsConfig()
        {
            this.ToTable("Plugin1_News");
            this.HasKey(news => news.Id);
            this.Property(news => news.Title).IsRequired().HasMaxLength(500);
            this.Property(news => news.Body).IsOptional().IsMaxLength();
        }
    }
}

 PM> install-package EntityFramework

public class MvcPluginMasterAppContext : DbContext, IUnitOfWork
{
    public DbSet<Category> Categories { set; get; }
    public DbSet<Product> Products { set; get; }

namespace MvcPluginMasterApp.PluginsBase
{
    public interface IUnitOfWork : IDisposable
    {
        IDbSet<TEntity> Set<TEntity>() where TEntity : class;
        int SaveAllChanges();
        void MarkAsChanged<TEntity>(TEntity entity) where TEntity : class;
        IList<T> GetRows<T>(string sql, params object[] parameters) where T : class;
        IEnumerable<TEntity> AddThisRange<TEntity>(IEnumerable<TEntity> entities) where TEntity : class;
        void SetDynamicEntities(Type[] dynamicTypes);
        void ForceDatabaseInitialize();
        void SetConfigurationsAssemblies(Assembly[] assembly);
    }
}

namespace MvcPluginMasterApp.DataLayer.Context
{
    public class MvcPluginMasterAppContext : DbContext, IUnitOfWork
    {
        private readonly IList<Assembly> _configurationsAssemblies = new List<Assembly>();
        private readonly IList<Type[]> _dynamicTypes = new List<Type[]>(); 
 
        public void ForceDatabaseInitialize()
        {
            Database.Initialize(force: true);
        }
 
        public void SetConfigurationsAssemblies(Assembly[] assemblies)
        {
            if (assemblies == null) return;
 
            foreach (var assembly in assemblies)
            {
                _configurationsAssemblies.Add(assembly);
            }
        }
 
        public void SetDynamicEntities(Type[] dynamicTypes)
        {
            if (dynamicTypes == null) return;
            _dynamicTypes.Add(dynamicTypes);
        }
 
        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            addConfigurationsFromAssemblies(modelBuilder);
            addPluginsEntitiesDynamically(modelBuilder);
            base.OnModelCreating(modelBuilder);
        }
 
        private void addConfigurationsFromAssemblies(DbModelBuilder modelBuilder)
        {
            foreach (var assembly in _configurationsAssemblies)
            {
                modelBuilder.Configurations.AddFromAssembly(assembly);
            }
        }
 
        private void addPluginsEntitiesDynamically(DbModelBuilder modelBuilder)
        {
            foreach (var types in _dynamicTypes)
            {
                foreach (var type in types)
                {
                    modelBuilder.RegisterEntityType(type);
                }
            }
        }
    }
}

namespace MvcPluginMasterApp.PluginsBase
{
    public interface IPlugin
    {
        EfBootstrapper GetEfBootstrapper();
        //...به همراه سایر متدهای مورد نیاز
    }
 
    public class EfBootstrapper
    {
        /// <summary>
        /// Assemblies containing EntityTypeConfiguration classes.
        /// </summary>
        public Assembly[] ConfigurationsAssemblies { get; set; }
 
        /// <summary>
        /// Domain classes.
        /// </summary>
        public Type[] DomainEntities { get; set; }
 
        /// <summary>
        /// Custom Seed method.
        /// </summary>
        public Action<IUnitOfWork> DatabaseSeeder { get; set; }
    } 
}

namespace MvcPluginMasterApp.Plugin1
{
    public class Plugin1 : IPlugin
    {
        public EfBootstrapper GetEfBootstrapper()
        {
            return new EfBootstrapper
            {
                DomainEntities = new[] { typeof(News) },
                ConfigurationsAssemblies = new[] { typeof(NewsConfig).Assembly },
                DatabaseSeeder = uow =>
                {
                    var news = uow.Set<News>();
                    if (news.Any())
                    {
                        return;
                    }
 
                    news.Add(new News
                    {
                        Title = "News 1",
                        Body = "news 1 news 1 news 1 ...."
                    });
 
                    news.Add(new News
                    {
                        Title = "News 2",
                        Body = "news 2 news 2 news 2 ...."
                    });
                }
            };
        }

[assembly: PreApplicationStartMethod(typeof(EFBootstrapperStart), "Start")]
namespace MvcPluginMasterApp
{
    public static class EFBootstrapperStart
    {
        public static void Start()
        {
            var plugins = SmObjectFactory.Container.GetAllInstances<IPlugin>().ToList();
            using (var uow = SmObjectFactory.Container.GetInstance<IUnitOfWork>())
            {
                initDatabase(uow, plugins);
                runDatabaseSeeders(uow, plugins);
            }
        }
 
        private static void initDatabase(IUnitOfWork uow, IEnumerable<IPlugin> plugins)
        {
            foreach (var plugin in plugins)
            {
                var efBootstrapper = plugin.GetEfBootstrapper();
                if (efBootstrapper == null) continue;
 
                uow.SetDynamicEntities(efBootstrapper.DomainEntities);
                uow.SetConfigurationsAssemblies(efBootstrapper.ConfigurationsAssemblies);
            }
 
            Database.SetInitializer(new MigrateDatabaseToLatestVersion<MvcPluginMasterAppContext, Configuration>());
            uow.ForceDatabaseInitialize();
        }
 
        private static void runDatabaseSeeders(IUnitOfWork uow, IEnumerable<IPlugin> plugins)
        {
            foreach (var plugin in plugins)
            {
                var efBootstrapper = plugin.GetEfBootstrapper();
                if (efBootstrapper == null || efBootstrapper.DatabaseSeeder == null) continue;
 
                efBootstrapper.DatabaseSeeder(uow);
                uow.SaveAllChanges();
            }
        }
    }
}

public async Task<long> GetDirectorySize(string path, string searchPattern)
{
    if (!Directory.EnumerateFileSystemEntries(path, searchPattern).Any())
        return 0;
    else
        return await Task.Run<long>(() => Directory.GetFiles(path, searchPattern,
        SearchOption.AllDirectories).Sum(t => (new FileInfo(t).Length)));
}

 AsyncTaskMethodBuilder<long>.Create()

public async ValueTask<long> GetDirectorySize(string path, string searchPattern)
{
    if (!Directory.EnumerateFileSystemEntries(path, searchPattern).Any())
        return 0;
    else
        return await Task.Run<long>(() => Directory.GetFiles(path, searchPattern,
        SearchOption.AllDirectories).Sum(t => (new FileInfo(t).Length)));
}

 PM> install-package System.Threading.Tasks.Extensions