v1.0.0

CC.Yi.DAL/DbContentFactory.cs

@@ -0,0 +1,50 @@
+using CC.Yi.Model;
+using Microsoft.EntityFrameworkCore;
+using System.Collections.Concurrent;
+using System.Threading;
+
+
+namespace CC.Yi.DAL
+{
+    public class DbContentFactory
+    {
+        private static  DataContext Webcontext;
+
+        public  DbContentFactory(DataContext webContext)
+        {
+            Webcontext = webContext;
+        }
+
+        //public static void Initialize(DataContext webContext)
+        //{
+        //    Webcontext = webContext;
+        //}
+        public static DataContext GetCurrentDbContent()
+        {
+            ////return new DataModelContainer();
+            ////一次请求共用一个上下文实例
+            ////每一次http请求都会开启一个新的线程，保证在一个线程中,DbContext是唯一的
+            ////CallContext：是线程内部唯一的数据槽（一块内存空间/容器）,相当于一个键值对数据容器，通过key获取value了,需要引入System.Runtime.Remoting.Messaging;命名空间
+            //DbContext db = CallContext.GetData("DbContext") as DbContext;
+            ////从 CallContext 中检索具有指定key“DbContext”的对象，并强转为DbContext
+            //if (db == null)//线程在数据槽里面没有此上下文
+            //{
+            //    db = Webcontext;
+            //    CallContext.SetData("DbContext", db);//放到数据槽中去,DbContext是key，db是value
+            //}
+            //return db;
+            return Webcontext;
+        }
+
+        //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;
+        //}
+    }
+}