init project

2021-02-23 09:51:50 +08:00
commit f7384b9afc
35 changed files with 938 additions and 0 deletions
--- a/Domain/SeedWork/Entity.cs
+++ b/Domain/SeedWork/Entity.cs
@@ -0,0 +1,92 @@
+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);
+        }
+    }
+}