完善ddd模块及错误异常中间件

src/Yi.Framework/Yi.Framework.Ddd.Application/Entities/IEntity.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Yi.Framework.Ddd.Entities
+{
+    public interface IEntity
+    {
+        //
+        // 摘要:
+        //     Returns an array of ordered keys for this entity.
+        object[] GetKeys();
+    }
+    public interface IEntity<TKey> : IEntity
+    {
+        //
+        // 摘要:
+        //     Unique identifier for this entity.
+        TKey Id { get; }
+    }
+}