Add project files.

Day03 Demo Solution.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.6.33829.357
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Demo.PL", "Demo.PL\Demo.PL.csproj", "{0244FE80-08B4-4EEF-8075-8A935AA5B75C}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Demo.DAL", "Demo.DAL\Demo.DAL.csproj", "{F5CC6B65-7E76-4ACE-BE99-7320C1F1103C}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Demo.BLL", "Demo.BLL\Demo.BLL.csproj", "{B9572953-D43F-4ECE-BD1B-5D75E5FAA82C}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{0244FE80-08B4-4EEF-8075-8A935AA5B75C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{0244FE80-08B4-4EEF-8075-8A935AA5B75C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{0244FE80-08B4-4EEF-8075-8A935AA5B75C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{0244FE80-08B4-4EEF-8075-8A935AA5B75C}.Release|Any CPU.Build.0 = Release|Any CPU
+		{F5CC6B65-7E76-4ACE-BE99-7320C1F1103C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{F5CC6B65-7E76-4ACE-BE99-7320C1F1103C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{F5CC6B65-7E76-4ACE-BE99-7320C1F1103C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{F5CC6B65-7E76-4ACE-BE99-7320C1F1103C}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B9572953-D43F-4ECE-BD1B-5D75E5FAA82C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B9572953-D43F-4ECE-BD1B-5D75E5FAA82C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B9572953-D43F-4ECE-BD1B-5D75E5FAA82C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B9572953-D43F-4ECE-BD1B-5D75E5FAA82C}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {1B503294-ED7B-4924-A315-70C5E013F91E}
+	EndGlobalSection
+EndGlobal

Demo.BLL/Demo.BLL.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Demo.DAL\Demo.DAL.csproj" />
+  </ItemGroup>
+
+</Project>

Demo.BLL/Interfaces/IDepartmentRepository.cs

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+using Demo.DAL;
+using Demo.DAL.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Demo.BLL.Interfaces
+{
+    public interface IDepartmentRepository : IGenericRepository<Department>
+    {
+
+    }
+}

Demo.BLL/Interfaces/IEmployeeRepository.cs

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+using Demo.DAL;
+using Demo.DAL.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Demo.BLL.Interfaces
+{
+    public interface IEmployeeRepository : IGenericRepository<Employee>
+    {
+
+        //I use IQueryable not  IEnumerable because I need make Filteration
+        IQueryable<Employee> GetEmployeeByaddress(string address);
+
+        IQueryable<Employee> SearchByName(string name);
+    }
+}

Demo.BLL/Interfaces/IGenericRepository.cs

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+using Demo.DAL.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Demo.BLL.Interfaces
+{
+    public  interface IGenericRepository<T> where T : class
+    {
+        //Async => Wrapping to each methods at ( Task) 
+        Task<IEnumerable<T>> GetAll();
+
+        Task<T> Get(int id);
+
+        void Add(T item);
+        void Update(T item);
+        void Delete(T item);
+    }
+}

Demo.BLL/Interfaces/IUnitOfWork.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Demo.BLL.Interfaces
+{
+    //signature for Property for each Repository
+    public interface IUnitOfWork : IAsyncDisposable
+    {
+        public IEmployeeRepository EmployeeRepository { get; set; }
+
+        public IDepartmentRepository DepartmentRepository { get; set; }
+
+        //signature for Method => (Complete) that represent  SaveChanges at DBContext
+        //return int => Number of rows that had affect ,
+       Task< int> Complete();
+
+
+    }
+}

Demo.BLL/Repositories/DepartmentRepository.cs

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+using Demo.BLL.Interfaces;
+using Demo.DAL.Contexts;
+using Demo.DAL.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Demo.BLL.Repositories
+{
+    public class DepartmentRepository : GenericRepository<Department>,IDepartmentRepository
+    {
+        public DepartmentRepository(MVCAppDbContext dbContext):base(dbContext)
+        {
+
+        }
+    }
+}

Demo.BLL/Repositories/EmployeeRepository.cs

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+using Demo.BLL.Interfaces;
+using Demo.DAL;
+using Demo.DAL.Contexts;
+using Demo.DAL.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Demo.BLL.Repositories
+{
+    public class EmployeeRepository : GenericRepository<Employee>, IEmployeeRepository
+    {
+        public EmployeeRepository(MVCAppDbContext dbContext) : base(dbContext)
+        {
+        }
+        public IQueryable<Employee> GetEmployeeByaddress(string address)
+        => _dbContext.Employees.Where(E => E.Address.ToLower().Contains(address.ToLower()));
+
+        //Searching 
+        public IQueryable<Employee> SearchByName(string name)
+       => _dbContext.Employees.Where(E => E.Name.ToLower().Contains(name));  //search => Compare Two Names 
+    }
+}

Demo.BLL/Repositories/GenericRepository.cs

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+using Demo.BLL.Interfaces;
+using Demo.DAL;
+using Demo.DAL.Contexts;
+using Demo.DAL.Models;
+using Microsoft.EntityFrameworkCore;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using static Microsoft.EntityFrameworkCore.DbLoggerCategory;
+
+namespace Demo.BLL.Repositories
+{
+    public class GenericRepository<T> : IGenericRepository<T> where T : ModelBase
+    {
+        private protected readonly MVCAppDbContext _dbContext; //
+
+        public GenericRepository(MVCAppDbContext dbContext) //Ask From ClR Create
+                                                            //Object from DbContext 
+        {
+            //dbContext = /*new MVCAppDbContext();*/
+
+            _dbContext = dbContext;
+        }
+
+        //Just(Add, Update, Delete) Will change state of object
+        public void Add(T item)
+         => _dbContext.Set<T>().Add(item); //for Example just state will change and is added 
+
+        public void Update(T item)
+          => _dbContext.Set<T>().Update(item);//Modified
+
+        public void Delete(T item)
+          => _dbContext.Set<T>().Remove(item); //Deleted
+
+        public async Task<T> Get(int id)
+
+            => await _dbContext.FindAsync<T>(id);
+
+
+        //After Install package (microsoft.entityframeworkcore.proxies), We make  Eager Loading to load Data of Departments at Employee
+        public async Task<IEnumerable<T>> GetAll()
+        {
+            if (typeof(T) == typeof(Employee))
+                return  (IEnumerable<T>) await _dbContext.Employees.Include(E => E.Department).AsNoTracking().ToListAsync();
+            else
+                return await _dbContext.Set<T>().AsNoTracking().ToListAsync();
+        }
+
+
+
+    }
+}

Demo.BLL/UnitOfWork.cs

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+using Demo.BLL.Interfaces;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Demo.DAL.Contexts;
+using Demo.BLL.Repositories;
+
+namespace Demo.BLL
+{
+    //UnitOfWork: Unit for each The Work With DbContext 
+    //UnitOfWork Encapsulate DbContext ,PL deal with UnitOfWork  and UnitOfWork deal with DbContext 
+    //UnitOfWork => [Represent(deal with) Repositories + Implement Complete Method that  Save Changes at DbContext + Dispose Method that dispsose connection]
+    public class UnitOfWork : IUnitOfWork 
+    {
+        private readonly MVCAppDbContext _dbContext;
+
+        //Automatic properties => Compiler will get and set for Repository at Background
+        public IEmployeeRepository EmployeeRepository { get; set; }
+        public IDepartmentRepository DepartmentRepository { get; set; }
+
+
+        //CTOR, Because when create object from UnitOfWork=> Make Initialization to two Repositories
+        public UnitOfWork(MVCAppDbContext dbContext) //ASk CLR for creating Object DbContext
+        {
+            _dbContext = dbContext;
+            EmployeeRepository = new EmployeeRepository(dbContext);
+            DepartmentRepository = new DepartmentRepository(dbContext);
+        }
+        //Add Dbcontext Save Changes 
+        public async Task<int> Complete()
+        {
+            return await _dbContext.SaveChangesAsync();
+        }
+
+
+        public async ValueTask DisposeAsync()
+        {
+            await _dbContext.DisposeAsync();
+        }
+    }
+}

Demo.DAL/Data/Configurations/DepartmentConfigurations.cs

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+using Demo.DAL.Models;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Demo.DAL.Data.Configurations
+{
+    public class DepartmentConfigurations : IEntityTypeConfiguration<Department>
+    {
+        public void Configure(EntityTypeBuilder<Department> builder)
+        {
+            //Fluent APIs for Department Entity
+            builder.Property(D => D.Id).UseIdentityColumn(10,10);
+
+            //the First 3 Lines(by default بيتنفذوا كده كده)
+            builder.HasMany(D => D.Employees)
+                .WithOne(D => D.Department)
+                .HasForeignKey(E => E.DepartmentId)
+                .OnDelete(DeleteBehavior.Cascade);
+                ;
+
+            builder.Property(D => D.Code)
+                .IsRequired(true);
+
+            builder.Property(E => E.Name)
+                .IsRequired(true)
+                .HasMaxLength(50);
+        }
+    }
+}

Demo.DAL/Data/Configurations/EmployeeConfigurations.cs

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+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Demo.DAL.Data.Configurations
+{
+    public class EmployeeConfigurations : IEntityTypeConfiguration<Employee>
+    {
+        public void Configure(EntityTypeBuilder<Employee> builder)
+        {
+            //fluent APIs
+
+            builder.Property(E => E.Salary)
+                .HasColumnType("decimal(18,2)");
+
+            builder.Property(E => E.Name)
+                .IsRequired(true)
+                .HasMaxLength(50);
+
+        }
+    }
+}

Demo.DAL/Data/Contexts/MVCAppDbContext.cs

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+using Demo.DAL.Data.Configurations;
+using Demo.DAL.Models;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Demo.DAL.Contexts
+{
+    public class MVCAppDbContext:IdentityDbContext
+    {
+
+        public MVCAppDbContext(DbContextOptions<MVCAppDbContext>options):base(options)
+        {
+
+        }
+
+        protected override void OnModelCreating(ModelBuilder modelBuilder)
+        {
+            //Fluent API 
+
+            modelBuilder.ApplyConfiguration(new DepartmentConfigurations());
+
+            modelBuilder.ApplyConfiguration(new EmployeeConfigurations());
+
+            base.OnModelCreating(modelBuilder);
+        }
+        //protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+        //   =>optionsBuilder.UseSqlServer("Server = .; Database = MVCAppDb;Trusted_Connection = true;");
+
+        public DbSet<Department> Departments { get; set; }
+
+        public DbSet<Employee> Employees { get; set; }
+
+        ///Identity Dbsets(4 Dbsets to Users and 3 Dbsets = 7 Dbsets) inherited from IdentityDbContext 
+        ///=> Generate 7 Tables and including tables(Users + Roles + Relationship between them(UserRoles) )
+        ///public DbSet<IdentityUser> Users { get; set; }
+        ///public DbSet<IdentityRole> Roles { get; set; }
+
+
+    }
+}