public class MyJsonResult
{
  public bool success { set; get; }
  public bool HasWarning { set; get; }
  public string WarningMessage { set; get; }
  public int errorcode { set; get; }

  public string message {set; get; }
  public object data { set; get; }
 }

<script type="text/javascript">
  function AddCommentSuccess(jsData) {
   if (jsData && jsData.message)
    alert(jsData.message);
   if (jsData && jsData.success) {
    document.getElementById("frmAddComment").reset();
      //افزودن کامنت جدید ساخته شده توسط کاربر به لیست کامنتهای صفحه
    $("#divAllComments").html(jsData.data + $("#divAllComments").html());    
   }
  }
</script>

public class User
    {
        public ShoppingCart ShoppingCart { get; set; }
        public void AddItem(string name) {
            // User class must know how to create OrderItem
            var item = new OrderItem() { Name = name };

            // User class must know how to add item to shopping cart
            ShoppingCart.Items.Add(item);
            
        }
        public void CheckOut() {
            // User class must know logic behind cost and discount calculations:
            // check for discount
            // check shipping method
            // check promotions
            // calculate total cost of items 
        }
    }
    public class OrderItem
    {
        public int Id { get; set; }
        public string Name { get; set; }

    }
    public class ShoppingCart
    {
        public int Id { get; set; }
        public List<OrderItem> Items { get; set; }
       
    }

 public class User
    {
        public ShoppingCart ShoppingCart { get; set; }
        
    }
    public class OrderItem
    {
        public int Id { get; set; }
        public string Name { get; set; }

    }
    public class ShoppingCart
    {
        public int Id { get; set; }
        public List<OrderItem> Items { get; set; }
        public void AddItem(string name)
        {
            // ShoppingCart class know how to create OrderItem
            var item = new OrderItem() { Name = name };

            // ShoppingCart class already know how to add item 
            Items.Add(item);

        }
        public void CheckOut()
        {
            // ShoppingCart class know logic behind cost and discount calculations:
            // check for discount
            // check shipping method
            // check promotions
            // calculate total cost of items 
        }
    }

public class ShapeWithoutPolymorphism
    {
        public double X { get; set; }
        public double Y { get; set; }
        public double Z { get; set; }
        public double Area(string shapeType)
        {
            switch (shapeType)
            {
                case "square":
                    return X * Y;
                case "rectangle":
                    return X * Y;
                case "trapze":
                    return (X + Z) * Y / 2;
                default:
                    return 0;
            }
        }
    }

  public abstract class Shape
    {
        public double X { get; set; }
        public double Y { get; set; }
        public virtual double Area()
        {
            return X * Y;
        }
    }
    public class Rectangle : Shape
    {
        // No need to override
    }
    public class Square : Shape
    {
        // No need to override
    }
    public class Trapze : Shape
    {
        public double Z { get; set; }
        public override double Area()
        {
            return (X + Z) * Y / 2;

        }
    }

public class User
    {
        public int Id { get; set; }
        public string UserName { get; set; }
        public string Password { get; set; }
    }

    public class LibraryManagement
    {
        public User CurrentUser { get; set; }
        public void AddBookToLibrary(int bookId)
        {
            // check for CurrentUser authority:
            // not user's responsibility nor LibraryManagement
        }
        public void RearrangeBook(int bookId, int shelfId)
        {
            // check for CurrentUser authority
            // not user's responsibility nor LibraryManagement
        }
    }
    public class UserManagement
    {
        public User CurrentUser { get; set; }
        public void AddUser(string name)
        {
            // check for CurrentUser authority:
            // not user's responsibility nor UserManagement
        }
        public void ChangeUserRole(int userId, int roleId)
        {
            // check for CurrentUser authority
            // not user's responsibility nor UserManagement
        }
    }
    public class AuthorizationService
    {
        public bool IsAuthorized(int userId, int roleId)
        {
            // get user roles from data base
            // return true if user has the authority
        }
    }

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Data.Entity.Migrations;
using System.Linq;
using System.Linq.Expressions;

namespace Sample
{
    public abstract class BaseEntity
    {
        public int Id { set; get; }
    }

    public class Receipt : BaseEntity
    {
        public int TotalPrice { set; get; }
    }

    public class MyContext : DbContext
    {
        public DbSet<Receipt> Receipts { get; set; }
    }

    public class Configuration : DbMigrationsConfiguration<MyContext>
    {
        public Configuration()
        {
            AutomaticMigrationsEnabled = true;
            AutomaticMigrationDataLossAllowed = true;
        }

        protected override void Seed(MyContext context)
        {
            if (!context.Receipts.Any())
            {
                for (int i = 0; i < 20; i++)
                {
                    context.Receipts.Add(new Receipt { TotalPrice = i });
                }
            }
            base.Seed(context);
        }
    }

    public static class EFUtils
    {
        public static IList<T> LoadEntities<T>(this DbContext ctx, Expression<Func<T, bool>> predicate) where T : class
        {
            return ctx.Set<T>().Where(predicate).ToList();
        }

        public static IList<T> LoadData<T>(this DbContext ctx, Func<T, bool> predicate) where T : class
        {
            return ctx.Set<T>().Where(predicate).ToList();
        }
    }

    public static class Test
    {
        public static void RunTests()
        {
            startDB();

            using (var context = new MyContext())
            {
                var list1 = context.LoadEntities<Receipt>(x => x.TotalPrice == 10);
                var list2 = context.LoadData<Receipt>(x => x.TotalPrice == 20);
            }
        }

        private static void startDB()
        {
            Database.SetInitializer(new MigrateDatabaseToLatestVersion<MyContext, Configuration>());
            // Forces initialization of database on model changes.
            using (var context = new MyContext())
            {
                context.Database.Initialize(force: true);
            }
        }
    }
}

 SELECT
[Extent1].[Id] AS [Id],
[Extent1].[TotalPrice] AS [TotalPrice]
FROM [dbo].[Receipts] AS [Extent1]
WHERE 10 = [Extent1].[TotalPrice]

 SELECT
[Extent1].[Id] AS [Id],
[Extent1].[TotalPrice] AS [TotalPrice]
FROM [dbo].[Receipts] AS [Extent1]

 public static IQueryable<TSource> Where<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, bool>> predicate);
public static IEnumerable<TSource> Where<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);

public abstract class BaseEntity
{
    public int Id { get; set; }
}

public class User : BaseEntity
{
   [Index(IsUnique = true)]
   public string EmailAddress { get; set; }
}

    public class UserRating : BaseEntity
    {
        public VoteSectionType SectionType { set; get; }

        public double RatingValue { get; set; }

        public int SectionId { get; set; }

        [ForeignKey("UserId")]
        public virtual User User { set; get; }
        public int UserId { set; get; }
    }

    public class UserRating : BaseEntity
    {
        [Index("IX_Single_UserRating", IsUnique = true, Order = 1)] //کلید منحصربفرد ترکیبی روی سه ستون
        public VoteSectionType SectionType { set; get; }

        public double RatingValue { get; set; }

        [Index("IX_Single_UserRating", IsUnique = true, Order = 2)]
        public int SectionId { get; set; }

        [ForeignKey("UserId")]
        public virtual User User { set; get; }

        [Index("IX_Single_UserRating", IsUnique = true, Order = 3)]
        public int? UserId { set; get; }
    }

 CREATE UNIQUE INDEX [IX_Single_UserRating]
ON [UserRatings] ([SectionType] ASC,[SectionId] ASC,[UserId] ASC);

{
    "userIsAuthorizedForCourseTranscripts": false,
    "modules": [
        {
            "title": "Course Overview",
            "clips": [
                {
                    "title": "Course Overview",
                    "playerParameters": "author=scott-allen&name=aspdotnet-core-1-0-fundamentals-m0&mode=live&clip=0&course=aspdotnet-core-1-0-fundamentals",
                    "transcripts": [ ]
                }
            ]
        },
        {
            "title": "Building Your First ASP.NET Core Application",
            "clips": [
                {
                    "title": "Introduction",
                    "playerParameters": "author=scott-allen&name=aspdotnet-core-1-0-fundamentals-m1&mode=live&clip=0&course=aspdotnet-core-1-0-fundamentals",
                    "transcripts": [
                        {
                            "displayTime": 0.0,
                            "text": "Hi! This is Scott, and this course will help you build your first application with ASP.NET Core."
                        },
                        {
                            "displayTime": 7.0,
                            "text": "In this course, we'll be using Visual Studio and the new ASP.NET Framework to build a web application that"
                        }
                    ]
                }
            ]
        }
    ]
}

public class PluralsightCourse
{
    public bool UserIsAuthorizedForCourseTranscripts { get; set; }
    public PluralsightCourseItems[] Modules { get; set; }
}
public class PluralsightCourseItems
{
    public string Title { get; set; }
    public PluralsightCourseClip[] Clips { get; set; }
}
public class PluralsightCourseClip
{
    public string Title { get; set; }
    public string PlayerParameters { get; set; }
    public PluralsightCourseClipTranscript[] Transcripts { get; set; }
}
public class PluralsightCourseClipTranscript
{
    public float DisplayTime { get; set; }
    public string Text { get; set; }
}

public static PluralsightCourse ProcessJsonFile(string jsonData)
{
    return JsonConvert.DeserializeObject<PluralsightCourse>(jsonData);
}

using System.ComponentModel.DataAnnotations.Schema;

namespace BlazorServer.Entities
{
    public class HotelRoomImage
    {
        public int Id { get; set; }

        public string RoomImageUrl { get; set; }

        [ForeignKey("RoomId")]
        public virtual HotelRoom HotelRoom { get; set; }
        public int RoomId { get; set; }
    }
}

namespace BlazorServer.Entities
{
    public class HotelRoom
    {
        // ...
        public virtual ICollection<HotelRoomImage> HotelRoomImages { get; set; }
    }
}

namespace BlazorServer.DataAccess
{
    public class ApplicationDbContext : DbContext
    {
        public DbSet<HotelRoomImage> HotelRoomImages { get; set; }

        // ...
    }
}

dotnet tool update --global dotnet-ef --version 5.0.3
dotnet build
dotnet ef migrations --startup-project ../BlazorServer.App/ add Init --context ApplicationDbContext
dotnet ef --startup-project ../BlazorServer.App/ database update --context ApplicationDbContext

namespace BlazorServer.Models
{
    public class HotelRoomImageDTO
    {
        public int Id { get; set; }

        public int RoomId { get; set; }

        public string RoomImageUrl { get; set; }
    }
}

using AutoMapper;
using BlazorServer.Entities;

namespace BlazorServer.Models.Mappings
{
    public class MappingProfile : Profile
    {
        public MappingProfile()
        {
            // ...
            CreateMap<HotelRoomImageDTO, HotelRoomImage>().ReverseMap(); // two-way mapping
        }
    }
}

namespace BlazorServer.Services
{
    public interface IHotelRoomImageService
    {
        Task<int> CreateHotelRoomImageAsync(HotelRoomImageDTO imageDTO);

        Task<int> DeleteHotelRoomImageByImageIdAsync(int imageId);

        Task<int> DeleteHotelRoomImageByRoomIdAsync(int roomId);

        Task<List<HotelRoomImageDTO>> GetHotelRoomImagesAsync(int roomId);
    }
}

namespace BlazorServer.Services
{
    public class HotelRoomImageService : IHotelRoomImageService
    {
        private readonly ApplicationDbContext _dbContext;
        private readonly IMapper _mapper;
        private readonly IConfigurationProvider _mapperConfiguration;

        public HotelRoomImageService(ApplicationDbContext dbContext, IMapper mapper)
        {
            _dbContext = dbContext ?? throw new ArgumentNullException(nameof(dbContext));
            _mapper = mapper ?? throw new ArgumentNullException(nameof(mapper));
            _mapperConfiguration = mapper.ConfigurationProvider;
        }

        public async Task<int> CreateHotelRoomImageAsync(HotelRoomImageDTO imageDTO)
        {
            var image = _mapper.Map<HotelRoomImage>(imageDTO);
            await _dbContext.HotelRoomImages.AddAsync(image);
            return await _dbContext.SaveChangesAsync();
        }

        public async Task<int> DeleteHotelRoomImageByImageIdAsync(int imageId)
        {
            var image = await _dbContext.HotelRoomImages.FindAsync(imageId);
            _dbContext.HotelRoomImages.Remove(image);
            return await _dbContext.SaveChangesAsync();
        }

        public async Task<int> DeleteHotelRoomImageByRoomIdAsync(int roomId)
        {
            var imageList = await _dbContext.HotelRoomImages.Where(x => x.RoomId == roomId).ToListAsync();
            _dbContext.HotelRoomImages.RemoveRange(imageList);
            return await _dbContext.SaveChangesAsync();
        }

        public Task<List<HotelRoomImageDTO>> GetHotelRoomImagesAsync(int roomId)
        {
            return _dbContext.HotelRoomImages
                            .Where(x => x.RoomId == roomId)
                            .ProjectTo<HotelRoomImageDTO>(_mapperConfiguration)
                            .ToListAsync();
        }
    }
}

namespace BlazorServer.App
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddScoped<IHotelRoomImageService, HotelRoomImageService>();
            // ...

using Microsoft.AspNetCore.Components.Forms;
using System.Threading.Tasks;

namespace BlazorServer.Services
{
    public interface IFileUploadService
    {
        void DeleteFile(string fileName, string webRootPath, string uploadFolder);
        Task<string> UploadFileAsync(IBrowserFile inputFile, string webRootPath, string uploadFolder);
    }
}

using Microsoft.AspNetCore.Components.Forms;
using System;
using System.IO;
using System.Threading.Tasks;

namespace BlazorServer.Services
{
    public class FileUploadService : IFileUploadService
    {
        private const int MaxBufferSize = 0x10000;

        public void DeleteFile(string fileName, string webRootPath, string uploadFolder)
        {
            var path = Path.Combine(webRootPath, uploadFolder, fileName);
            if (File.Exists(path))
            {
                File.Delete(path);
            }
        }

        public async Task<string> UploadFileAsync(IBrowserFile inputFile, string webRootPath, string uploadFolder)
        {
            createUploadDir(webRootPath, uploadFolder);
            var (fileName, imageFilePath) = getOutputFileInfo(inputFile, webRootPath, uploadFolder);

            using (var outputFileStream = new FileStream(
                        imageFilePath, FileMode.Create, FileAccess.Write,
                        FileShare.None, MaxBufferSize, useAsync: true))
            {
                using var inputStream = inputFile.OpenReadStream();
                await inputStream.CopyToAsync(outputFileStream);
            }

            return $"{uploadFolder}/{fileName}";
        }

        private static (string FileName, string FilePath) getOutputFileInfo(
                    IBrowserFile inputFile, string webRootPath, string uploadFolder)
        {
            var fileName = Path.GetFileName(inputFile.Name);
            var imageFilePath = Path.Combine(webRootPath, uploadFolder, fileName);
            if (File.Exists(imageFilePath))
            {
                var fileNameWithoutExtension = Path.GetFileNameWithoutExtension(fileName);
                var fileExtension = Path.GetExtension(fileName);
                fileName = $"{fileNameWithoutExtension}-{Guid.NewGuid()}{fileExtension}";
                imageFilePath = Path.Combine(webRootPath, uploadFolder, fileName);
            }
            return (fileName, imageFilePath);
        }

        private static void createUploadDir(string webRootPath, string uploadFolder)
        {
            var folderDirectory = Path.Combine(webRootPath, uploadFolder);
            if (!Directory.Exists(folderDirectory))
            {
                Directory.CreateDirectory(folderDirectory);
            }
        }
    }
}

<Project Sdk="Microsoft.NET.Sdk">
  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.Components.Web" Version="5.0.3" />
  </ItemGroup>
</Project>

namespace BlazorServer.App
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddScoped<IFileUploadService, FileUploadService>();
            // ...

Open source MVVM framework for ASP.NET Core and OWIN 

View

@viewModel DotvvmDemo.CalculatorViewModel, Dotvvm
    
<p>
    Enter the first number: 
    <dot:TextBox Text="{value: Number1}" />
</p>
<p>
    Enter the second number: 
    <dot:TextBox Text="{value: Number2}" />
</p>
<p>
    <dot:Button Text="Calculate" Click="{command: Calculate()}" />
</p>
<p>
    The result is: {{value: Result}}
</p>

ViewModel

using System;
    
namespace DotvvmDemo 
{
    public class CalculatorViewModel 
    {
            
        public int Number1 { get; set; }
            
        public int Number2 { get; set; }
            
        public int Result { get; set; }
            
        public void Calculate() 
        {
            Result = Number1 + Number2;
        }
    }
}