v3.0.0

v3.0.0

CC.Yi.Old/CC.Yi.DAL/DbContentFactory.cs

@@ -0,0 +1,58 @@
+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;
+        private static object myLock = new object();
+
+        public static void Initialize(DataContext webContext)
+        {
+
+            Monitor.Enter(myLock);
+            {
+                Webcontext = webContext;
+            }
+        }
+        public static DataContext GetCurrentDbContent()
+        {
+
+            DataContext db = CallContext.GetData("DbContext") as DataContext;
+
+            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
+            }
+
+            try
+            {
+                    Monitor.Exit(myLock);
+            }
+            catch
+            {
+            }
+
+
+            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;
+        }
+    }
+}