v1.0.0

CC.Yi.DALFactory/DbSessionFactory.cs

@@ -0,0 +1,35 @@
+using CC.Yi.IDAL;
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace CC.Yi.DALFactory
+{
+    public class DbSessionFactory
+    {
+        public static IDbSession GetCurrentDbSession()
+        {
+            IDbSession db = CallContext.GetData("DbSession") as IDbSession;
+            if (db == null)
+            {
+                db = new DbSession();
+                CallContext.SetData("DbSession", db);
+            }
+            return db;
+        }
+
+        private static class CallContext
+        {
+            static ConcurrentDictionary<string, AsyncLocal<object>> state = new ConcurrentDictionary<string, AsyncLocal<object>>();
+
+            public static void SetData(string name, object data) =>
+                state.GetOrAdd(name, _ => new AsyncLocal<object>()).Value = data;
+
+            public static object GetData(string name) =>
+                state.TryGetValue(name, out AsyncLocal<object> data) ? data.Value : null;
+        }
+    }
+}