Hello HttpContextAccessor

Author: HaoK

src/Microsoft.AspNet.Http.Abstractions/IHttpContextAccessor.cs

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+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+namespace Microsoft.AspNet.Http
+{
+    public interface IHttpContextAccessor
+    {
+        HttpContext HttpContext { get; set; }
+    }
+}

src/Microsoft.AspNet.Http/HttpContextAccessor.cs

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+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+#if DNX451
+using System.Runtime.Remoting.Messaging;
+using System.Runtime.Remoting;
+#elif DNXCORE50
+using System.Threading;
+#endif
+
+namespace Microsoft.AspNet.Http.Internal
+{
+    public class HttpContextAccessor : IHttpContextAccessor
+    {
+#if DNX451
+        private const string LogicalDataKey = "__HttpContext_Current__";
+
+        public HttpContext HttpContext
+        {
+            get
+            {
+                var handle = CallContext.LogicalGetData(LogicalDataKey) as ObjectHandle;
+                return handle != null ? handle.Unwrap() as HttpContext : null;
+            }
+            set
+            {
+                CallContext.LogicalSetData(LogicalDataKey, new ObjectHandle(value));
+            }
+        }
+
+#elif DNXCORE50
+        private AsyncLocal<HttpContext> _httpContextCurrent = new AsyncLocal<HttpContext>();
+        public HttpContext HttpContext
+        {
+            get
+            {
+                return _httpContextCurrent.Value;
+            }
+            set
+            {
+                _httpContextCurrent.Value = value;
+            }
+        }
+#endif
+    }
+}