init project

Domain/AggregateModel/AppAggregate/App.cs

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+using Domain.SeedWork;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Domain.AggregateModel.AppAggregate
+{
+    public class App : IAggregateRoot
+    {
+        public int Id { get; private set; }
+        public string AppKey { get;private set; }
+        public string BaseUrl { get; private set; }
+        public string Remarks { get;private set; }
+        private App() { }
+        public App(string appKey,string remarks)
+        {
+            AppKey = appKey;
+            Remarks = remarks;
+        }
+    }
+}

Domain/AggregateModel/AppAggregate/IAppRepository.cs

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+using Domain.SeedWork;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Domain.AggregateModel.AppAggregate
+{
+    public interface IAppRepository:IRepository<App>
+    {
+        void Add(App app);
+        Task<App> GetAsync(int id);
+    }
+}

Domain/AggregateModel/LinkAggregate/ILinkRepository.cs

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+using Domain.SeedWork;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Domain.AggregateModel.LinkAggregate
+{
+    public interface ILinkRepository:IRepository<Link>
+    {
+        void Add(Link link);
+
+        Task<Link> GetAsync(string shortCode);
+    }
+}

Domain/AggregateModel/LinkAggregate/Link.cs

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+using Base62;
+using Domain.SeedWork;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Security.Cryptography;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Domain.AggregateModel.LinkAggregate
+{
+    public class Link:IAggregateRoot
+    {
+        /// <summary>
+        /// 非自增主键
+        /// </summary>
+        public string ShortCode { get; private set; }
+        public string BaseUrl { get; private set; }
+        public string SuffixUrl { get; private set; }
+        public string FullUrl { get; private set; }
+        public int AppId { get; private set; }
+        public DateTime Time { get; private set; }
+
+        private Link()
+        {
+
+        }
+        /// <summary>
+        /// 创建一条新的短链接
+        /// </summary>
+        /// <param name="baseUrl"></param>
+        /// <param name="suffixUrl"></param>
+        /// <param name="appId">分配的应用id</param>
+        public Link(string baseUrl,string suffixUrl,int appId)
+        {
+            BaseUrl = baseUrl;
+            SuffixUrl = suffixUrl;
+            FullUrl = new Uri(new Uri(baseUrl),suffixUrl).ToString();
+            AppId = appId;
+            Time = DateTime.Now;
+            CalculateShortCode();
+        }
+        /// <summary>
+        /// 根据值计算短链字段
+        /// </summary>
+        /// <returns></returns>
+        private void CalculateShortCode()
+        {
+            string code;
+            using (var md5 = MD5.Create())
+            {
+                var result = md5.ComputeHash(Encoding.UTF8.GetBytes(FullUrl));
+                var res = new[] { BitConverter.ToInt64(result, 0) ,BitConverter.ToInt64(result,8)};
+                //任意取其中一条即可
+                code = res[new Random().Next(0,1)].ToBase62();
+            }
+            ShortCode = code;
+        }
+    }
+}

Domain/Domain.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Base62-Net" Version="1.2.157201" />
+    <PackageReference Include="MediatR.Extensions.Microsoft.DependencyInjection" Version="9.0.0" />
+  </ItemGroup>
+
+</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;
+        }
+    }
+}