init project

Domain/SeedWork/Entity.cs

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+using MediatR;
+using System;
+using System.Collections.Generic;
+
+namespace Domain.SeedWork
+{
+    public abstract class Entity
+    {
+        int? _requestedHashCode;
+        int _Id;
+        public virtual int Id
+        {
+            get
+            {
+                return _Id;
+            }
+            protected set
+            {
+                _Id = value;
+            }
+        }
+
+        private List<INotification> _domainEvents;
+        public IReadOnlyCollection<INotification> DomainEvents => _domainEvents?.AsReadOnly();
+
+        public void AddDomainEvent(INotification eventItem)
+        {
+            _domainEvents = _domainEvents ?? new List<INotification>();
+            _domainEvents.Add(eventItem);
+        }
+
+        public void RemoveDomainEvent(INotification eventItem)
+        {
+            _domainEvents?.Remove(eventItem);
+        }
+
+        public void ClearDomainEvents()
+        {
+            _domainEvents?.Clear();
+        }
+
+        public bool IsTransient()
+        {
+            return Id == default;
+        }
+
+        public override bool Equals(object obj)
+        {
+            if (obj == null || !(obj is Entity))
+                return false;
+
+            if (ReferenceEquals(this, obj))
+                return true;
+
+            if (this.GetType() != obj.GetType())
+                return false;
+
+            Entity item = (Entity)obj;
+
+            if (item.IsTransient() || this.IsTransient())
+                return false;
+            else
+                return item.Id == this.Id;
+        }
+
+        public override int GetHashCode()
+        {
+            if (!IsTransient())
+            {
+                if (!_requestedHashCode.HasValue)
+                    _requestedHashCode = this.Id.GetHashCode() ^ 31; // XOR for random distribution (http://blogs.msdn.com/b/ericlippert/archive/2011/02/28/guidelines-and-rules-for-gethashcode.aspx)
+
+                return _requestedHashCode.Value;
+            }
+            else
+                return base.GetHashCode();
+
+        }
+        public static bool operator ==(Entity left, Entity right)
+        {
+            if (Object.Equals(left, null))
+                return (Object.Equals(right, null)) ? true : false;
+            else
+                return left.Equals(right);
+        }
+
+        public static bool operator !=(Entity left, Entity right)
+        {
+            return !(left == right);
+        }
+    }
+}

Domain/SeedWork/Enumeration.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+
+namespace Domain.SeedWork
+{
+    public abstract class Enumeration : IComparable
+    {
+        public string Name { get; private set; }
+
+        public int Id { get; private set; }
+
+        protected Enumeration(int id, string name)
+        {
+            Id = id;
+            Name = name;
+        }
+
+        public override string ToString() => Name;
+
+        public static IEnumerable<T> GetAll<T>() where T : Enumeration
+        {
+            var fields = typeof(T).GetFields(BindingFlags.Public | BindingFlags.Static | BindingFlags.DeclaredOnly);
+
+            return fields.Select(f => f.GetValue(null)).Cast<T>();
+        }
+
+        public override bool Equals(object obj)
+        {
+            var otherValue = obj as Enumeration;
+
+            if (otherValue == null)
+                return false;
+
+            var typeMatches = GetType().Equals(obj.GetType());
+            var valueMatches = Id.Equals(otherValue.Id);
+
+            return typeMatches && valueMatches;
+        }
+
+        public override int GetHashCode() => Id.GetHashCode();
+
+        public static int AbsoluteDifference(Enumeration firstValue, Enumeration secondValue)
+        {
+            var absoluteDifference = Math.Abs(firstValue.Id - secondValue.Id);
+            return absoluteDifference;
+        }
+
+        public static T FromValue<T>(int value) where T : Enumeration
+        {
+            var matchingItem = Parse<T, int>(value, "value", item => item.Id == value);
+            return matchingItem;
+        }
+
+        public static T FromDisplayName<T>(string displayName) where T : Enumeration
+        {
+            var matchingItem = Parse<T, string>(displayName, "display name", item => item.Name == displayName);
+            return matchingItem;
+        }
+
+        private static T Parse<T, K>(K value, string description, Func<T, bool> predicate) where T : Enumeration
+        {
+            var matchingItem = GetAll<T>().FirstOrDefault(predicate);
+
+            if (matchingItem == null)
+                throw new InvalidOperationException($"'{value}' is not a valid {description} in {typeof(T)}");
+
+            return matchingItem;
+        }
+
+        public int CompareTo(object other) => Id.CompareTo(((Enumeration)other).Id);
+    }
+}

Domain/SeedWork/IAggregateRoot.cs

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+namespace Domain.SeedWork
+{
+    public interface IAggregateRoot
+    {
+    }
+}

Domain/SeedWork/IRepository.cs

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+namespace Domain.SeedWork
+{
+    public interface IRepository<T> where T : IAggregateRoot
+    {
+        IUnitOfWork UnitOfWork { get; }
+    }
+}

Domain/SeedWork/IUnitOfWork.cs

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+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Domain.SeedWork
+{
+    public interface IUnitOfWork : IDisposable
+    {
+        Task<int> SaveChangesAsync(CancellationToken cancellationToken = default(CancellationToken));
+        Task<bool> SaveEntitiesAsync(CancellationToken cancellationToken = default(CancellationToken));
+    }
+}

Domain/SeedWork/ValueObject.cs

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+using System.Collections.Generic;
+using System.Linq;
+
+namespace Domain.SeedWork
+{
+    public abstract class ValueObject
+    {
+        protected static bool EqualOperator(ValueObject left, ValueObject right)
+        {
+            if (ReferenceEquals(left, null) ^ ReferenceEquals(right, null))
+            {
+                return false;
+            }
+            return ReferenceEquals(left, null) || left.Equals(right);
+        }
+
+        protected static bool NotEqualOperator(ValueObject left, ValueObject right)
+        {
+            return !(EqualOperator(left, right));
+        }
+
+        protected abstract IEnumerable<object> GetEqualityComponents();
+
+        public override bool Equals(object obj)
+        {
+            if (obj == null || obj.GetType() != GetType())
+            {
+                return false;
+            }
+
+            var other = (ValueObject)obj;
+
+            return this.GetEqualityComponents().SequenceEqual(other.GetEqualityComponents());
+        }
+
+        public override int GetHashCode()
+        {
+            return GetEqualityComponents()
+             .Select(x => x != null ? x.GetHashCode() : 0)
+             .Aggregate((x, y) => x ^ y);
+        }
+
+        public ValueObject GetCopy()
+        {
+            return this.MemberwiseClone() as ValueObject;
+        }
+    }
+}