/// <summary>
/// دستور العمل
/// </summary>
class Recipe
{
  public int Id { get; set; }
  public string Name { get; set; }
}

/// <summary>
/// بازخورد
/// </summary>
class Review
{
  public int RecipeId { get; set; }
  public string ReviewText { get; set; }
}

Recipe[] recipes =
{
   new Recipe {Id = 1, Name = "Mashed Potato"},
   new Recipe {Id = 2, Name = "Crispy Duck"},
   new Recipe {Id = 3, Name = "Sachertorte"}
};

Review[] reviews =
{
   new Review {RecipeId = 1, ReviewText = "Tasty!"},
   new Review {RecipeId = 1, ReviewText = "Not nice :("},
   new Review {RecipeId = 1, ReviewText = "Pretty good"},
   new Review {RecipeId = 2, ReviewText = "Too hard"},
   new Review {RecipeId = 2, ReviewText = "Loved it"}
};

var query = from recipe in recipes
join review in reviews on recipe.Id equals review.RecipeId
select new //anonymous type
{
   RecipeName = recipe.Name,
   RecipeReview = review.ReviewText
};

foreach (var item in query)
{
   Console.WriteLine($"{item.RecipeName}-{item.RecipeReview}");
}

Mashed Potato-Tasty!
Mashed Potato-Not nice :(
Mashed Potato-Pretty good
Crispy Duck-Too hard
Crispy Duck-Loved it

var query = from recipe in recipes
join review in reviews on recipe.Id equals review.RecipeId
into reviewGroup
select new //anonymous type
{
   RecipeName = recipe.Name,
   Reviews = reviewGroup//collection of related reviews
};

foreach (var item in query)
{
   Console.WriteLine($"Review for {item.RecipeName}");
   foreach (var review in item.Reviews)
   {
       Console.WriteLine($"-{review.ReviewText}");
   }
}

Review for Mashed Potato
-Tasty!
-Not nice :(
-Pretty good
Review for Crispy Duck
-Too hard
-Loved it
Review for Sachertorte

var query = from recipe in recipes
join review in reviews on recipe.Id equals review.RecipeId
into reviewGroup
from rg in reviewGroup.DefaultIfEmpty()
select new //anonymous type
{
   RecipeName = recipe.Name,
   //RecipeReview = rg.ReviewText SystemNullException
   RecipeReview = (rg == null ? "n/a" : rg.ReviewText)
};

foreach (var item in query)
{
   Console.WriteLine($"{item.RecipeName}-{item.RecipeReview}");
}

Mashed Potato-Tasty!
Mashed Potato-Not nice :(
Mashed Potato-Pretty good
Crispy Duck-Too hard
Crispy Duck-Loved it
Sachertorte-n/a

var query = from recipe in recipes
join review in reviews on recipe.Id equals review.RecipeId
into reviewGroup
from rg in reviewGroup.DefaultIfEmpty(new Review { ReviewText = "N/A" })
select new //anonymous type
{
   RecipeName = recipe.Name,
   RecipeReview = rg.ReviewText
};

foreach (var item in query)
{
   Console.WriteLine($"{item.RecipeName}-{item.RecipeReview}");
}

 Mashed Potato-Tasty!
Mashed Potato-Not nice :(
Mashed Potato-Pretty good
Crispy Duck-Too hard
Crispy Duck-Loved it
Sachertorte-N/A 
 

If Not a And b Then
  ...
Else
  ...
EndIf

if(!(a) && b)
{
...
}
else
{
}

public interface ICommand
{
}

public class Command1 : ICommand
{
}

public class Command2 : ICommand
{
}

ICommand command = new Command1();
if (!(command is Command2))
{

}

if (command is not Command2)
{

}

if ((command is ICommand) && !(command is Command2))
{

}

if (command is ICommand and not Command2)
{

}

if (command is Command1 or Command2)
{

}

var number = new Random().Next(1, 10);
if (number > 2 && number < 8)
{

}

if (number is > 2 and < 8)
{

}

public static bool IsLetterOrSeparator(char c) =>
   (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '.' || c == ',';

public static bool IsLetterOrSeparator(char c) =>
   c is (>= 'a' and <= 'z') or (>= 'A' and <= 'Z') or '.' or ',';

 var number = new Random().Next(1, 10);
 if (number <= 0)
 {
     Console.WriteLine("Less than or equal to 0");
 }
 else if (number > 0 && number <= 10)
 {
     Console.WriteLine("More than 0 but less than or equal to 10");
 }
 else
 {
     Console.WriteLine("More than 10");
 }

// C#9.0
 switch (number)
 {
     case <= 0:
         Console.WriteLine("Less than or equal to 0");
         break;
     case > 0 and <= 10:
         Console.WriteLine("More than 0 but less than or equal to 10");
         break;
     default:
         Console.WriteLine("More than 10");
         break;
 }

// C#7.0
 switch (number)
 {
     case int value when value <= 0:
         Console.WriteLine("Less than or equal to 0");
         break;
     case int value when value > 0 && value <= 10:
         Console.WriteLine("More than 0 but less than or equal to 10");
         break;
     default:
         Console.WriteLine("More than 10");
         break;
 }

 var message = number switch
 {
     <= 0 => "Less than or equal to 0",
     > 0 and <= 10 => "More than 0 but less than or equal to 10",
     _ => "More than 10"
 };

private static int GetDiscount(Product p) => p switch
        {
            Food => 0, // Food _ => 0 before C# 9
            Book b => 75, // Book b _ => 75 before C# 9
            _ => 25
        };

• صفحه‌ی اصلی
• منو
• یک صفحه‌ی خوش آمدگویی
• صفحه‌ی ورود و نمایش اطلاعات
  

<Window x:Class="TwoViews.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        Title="MVVM Light View Switching"
        d:DesignHeight="300"
        d:DesignWidth="300"
        DataContext="{Binding Main,
                              Source={StaticResource Locator}}"
        ResizeMode="NoResize"
        SizeToContent="WidthAndHeight"
        mc:Ignorable="d">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>

        <ContentControl Content="{Binding CurrentViewModel}" />

        <DockPanel Grid.Row="1" Margin="5">
            <Button Width="75"
                    Height="23"
                    Command="{Binding SecondViewCommand}"
                    Content="Second View"
                    DockPanel.Dock="Right" />
            <Button Width="75"
                    Height="23"
                    Command="{Binding FirstViewCommand}"
                    Content="First View"
                    DockPanel.Dock="Left" />
        </DockPanel>
    </Grid>
</Window>

    /// This is our MainViewModel that is tied to the MainWindow via the 
    /// ViewModelLocator class.
    /// </summary>
    public class MainViewModel : ViewModelBase
    {
        /// <summary>
        /// Static instance of one of the ViewModels.
        /// </summary>
        private static readonly SecondViewModel SecondViewModel = new SecondViewModel();
        /// <summary>
        /// Static instance of one of the ViewModels.
        /// </summary>
        private static readonly FirstViewModel FirstViewModel = new FirstViewModel();
        /// <summary>
        /// The current view.
        /// </summary>
        private ViewModelBase _currentViewModel;
        /// <summary>
        /// Default constructor.  We set the initial view-model to 'FirstViewModel'.
        /// We also associate the commands with their execution actions.
        /// </summary>
        public MainViewModel()
        {
            CurrentViewModel = FirstViewModel;
            FirstViewCommand = new RelayCommand(ExecuteFirstViewCommand);
            SecondViewCommand = new RelayCommand(ExecuteSecondViewCommand);
        }
        /// <summary>
        /// The CurrentView property.  The setter is private since only this 
        /// class can change the view via a command.  If the View is changed,
        /// we need to raise a property changed event (via INPC).
        /// </summary>
        public ViewModelBase CurrentViewModel
        {
            get { return _currentViewModel; }
            set
            {
                if (_currentViewModel == value)
                    return;
                _currentViewModel = value;
                RaisePropertyChanged("CurrentViewModel");
            }
        }
        /// <summary>
        /// Simple property to hold the 'FirstViewCommand' - when executed
        /// it will change the current view to the 'FirstView'
        /// </summary>
        public ICommand FirstViewCommand { get; private set; }
        /// <summary>
        /// Simple property to hold the 'SecondViewCommand' - when executed
        /// it will change the current view to the 'SecondView'
        /// </summary>
        public ICommand SecondViewCommand { get; private set; }
        /// <summary>
        /// Set the CurrentViewModel to 'FirstViewModel'
        /// </summary>
        private void ExecuteFirstViewCommand()
        {
            CurrentViewModel = FirstViewModel;
        }
        /// <summary>
        /// Set the CurrentViewModel to 'SecondViewModel'
        /// </summary>
        private void ExecuteSecondViewCommand()
        {
            CurrentViewModel = SecondViewModel;
        }
    }

    <Application.Resources>
        <vm:ViewModelLocator x:Key="Locator" d:IsDataSource="True" />
        <!--
            We define the data templates here so we can apply them across the
            entire application.
         
            The data template just says that if our data type is of a particular
            view-model type, then render the appropriate view.  The framework
            takes care of this dynamically.  Note that the DataContext for
            the underlying view is already set at this point, so the
            view (UserControl), doesn't need to have it's DataContext set
            directly.
        -->
        <DataTemplate DataType="{x:Type vm:SecondViewModel}">
            <views:SecondView />
        </DataTemplate>
        <DataTemplate DataType="{x:Type vm:FirstViewModel}">
            <views:FirstView />
        </DataTemplate>
    </Application.Resources>

<body>
    <div id="app">
        <svg class="loading-progress">
            <circle r="40%" cx="50%" cy="50%" />
            <circle r="40%" cx="50%" cy="50%" />
        </svg>
        <div class="loading-progress-text"></div>
    </div>

.loading-progress {
    position: relative;
    display: block;
    width: 8rem;
    height: 8rem;
    margin: 20vh auto 1rem auto;
}
    .loading-progress circle {
        fill: none;
        stroke: #e0e0e0;
        stroke-width: 0.6rem;
        transform-origin: 50% 50%;
        transform: rotate(-90deg);
    }
        .loading-progress circle:last-child {
            stroke: #1b6ec2;
            stroke-dasharray: calc(3.141 * var(--blazor-load-percentage, 0%) * 0.8), 500%;
            transition: stroke-dasharray 0.05s ease-in-out;
        }
.loading-progress-text {
    position: absolute;
    text-align: center;
    font-weight: bold;
    inset: calc(20vh + 3.25rem) 0 auto 0.2rem;
}
    .loading-progress-text:after {
        content: var(--blazor-load-percentage-text, "Loading");
    }

<body>
    <div id="app">
      <div class="progress">
        <div class="progress-bar progress-bar-striped progress-bar-animated" 
            role="progressbar" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100" 
            style="width: var(--blazor-load-percentage, 0%)">
            <div class="loading-text"></div>
        </div>        
      </div>

.loading-text:after {
        content: var(--blazor-load-percentage-text, "Loading");
    }

namespace SchedulerDemo.Jobs
{
    using System;
    using System.Linq;
    using System.IO;
    using Quartz;
    using System.Collections.Generic;
    using System.Configuration;

    [PersistJobDataAfterExecution]
    [DisallowConcurrentExecution]
    public class SendJob : IJob
    {
        public void Execute(IJobExecutionContext context)
        {
          
            using (var db = new DALModel.DALEntities())
            {
               
                byte status = (byte)AllEnums.Sms.Status.InProgress;
                var item = db.SentBoxes.Where(p => p.Status == status && p.IsDeleted==false && p.UserInfo.IsDeleted==false &&  p.HasTime == true && p.SendInTime == false && p.SendDateX <= DateTime.Now).OrderBy(p=>p.Id).FirstOrDefault();
                Cls_SMS.ClsSend sms_Batch = new Cls_SMS.ClsSend();

                if (item != null)
                {
                    decimal smsCount = 0;
                    if (item.UserInfo.CalculateType == Convert.ToByte(AllEnums.FinancialTransaction.CalculationUnit.Message))
                    {
                        smsCount = Convert.ToDecimal(Function.GetSmsCount(item.Price, item.UserId));
                    }
                    else
                    {
                        smsCount = Convert.ToDecimal(item.CorrectCount);
                    }
                    decimal adminCredit = Function.GetAdminCreditLink1000();
                    if (adminCredit != -1 && adminCredit >= smsCount)
                    {
                       
                        if ((item.UserInfo.Credit - (item.UserInfo.LowCredit)) >= item.Price)
                        {
                            item.SendInTime = true;
                            db.SaveChanges();
                            string numberList = item.NumberList;
                            int position = item.NumberList.LastIndexOf(',');
                            numberList = item.NumberList.Substring(0, position);
                            List<string> receivers_List = new List<string>();
                            receivers_List = (numberList).Split(',').ToList();
                            string[] ret2 = new string[2];
                            string[] DestAdd = new string[receivers_List.Count];
                            DestAdd = receivers_List.ToArray();
                            ret2 = sms_Batch.SendSMS_Batch(item.Message, DestAdd, item.UserInfoSenderNumber.AllNumber.Number, ConfigurationManager.AppSettings["SmsUserNameLink1000"], ConfigurationManager.AppSettings["SmsPasswordLink1000"], ConfigurationManager.AppSettings["SmsIPAddressLink1000"], ConfigurationManager.AppSettings["SmsCompanyLink1000"], false, item.Id);
                            var sentBoxUpdate = db.SentBoxes.FirstOrDefault(p => p.Id == item.Id);
                            sentBoxUpdate.Status = Convert.ToByte(AllEnums.Sms.Status.Send);
                            sentBoxUpdate.FinancialTransactionId = db.FinancialTransactions.Where(p => p.UserId == item.UserId).Max(p => p.Id);

                            if (ret2 != null)
                            {
                                sentBoxUpdate.RetValue0 = ret2[0];
                                sentBoxUpdate.RetValue1 = ret2[1];
                            }
                            db.SaveChanges();
                        }
                        else
                        {
                            byte statusFailedForAccount = (byte)AllEnums.Sms.Status.FailedForAccount;
                            item.SendInTime = true;
                            item.Status = statusFailedForAccount;
                            item.FailedCount = item.CorrectCount;
                            item.FailedList = item.NumberList;
                            db.SaveChanges();

                        }
                    }
                    else
                    {
                        byte statusFaildForError = (byte)AllEnums.Sms.Status.FaildForError;
                        item.SendInTime = true;
                        item.Status = statusFaildForError;
                        item.FailedCount = item.CorrectCount;
                        item.FailedList = item.NumberList;
                        db.SaveChanges();

                    }
                }


            }
        }
    }
}

namespace SchedulerDemo.Interfaces
{
    public interface IScheduleSend
    {
        void RunSendSms();
    }
}

namespace SchedulerDemo.Jobs
{
    using System;
    using Quartz;
    using Quartz.Impl;
    using SchedulerDemo.Interfaces;
    using SchedulerDemo.Jobs;

    public class SendSchedule : IScheduleSend
    {
        public void RunSendSms()
        {
            DateTimeOffset startTime = DateBuilder.FutureDate(2, IntervalUnit.Second);

            IJobDetail job = JobBuilder.Create<SendJob>()
                                       .WithIdentity("jobSendSmsInTime")
                                       .Build();

            ITrigger trigger = TriggerBuilder.Create()
                                             .WithIdentity("triggerSendSmsInTime")
                                             .StartAt(startTime)
                                             .WithSimpleSchedule(x => x.WithIntervalInMinutes(5).RepeatForever())
                                             .Build();

            ISchedulerFactory sf = new StdSchedulerFactory();
            IScheduler sc = sf.GetScheduler();
            sc.ScheduleJob(job, trigger);

            sc.Start();
        }
    }
}