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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.Threading;
namespace Microsoft.AspNetCore.Http
{
public class HttpContextAccessor : IHttpContextAccessor
{
private static AsyncLocal<HttpContextHolder> _httpContextCurrent = new AsyncLocal<HttpContextHolder>();
public HttpContext HttpContext
{
get
{
return _httpContextCurrent.Value?.Context;
}
set
{
var holder = _httpContextCurrent.Value;
if (holder != null)
{
// Clear current HttpContext trapped in the AsyncLocals, as its done.
holder.Context = null;
}
if (value != null)
{
// Use an object indirection to hold the HttpContext in the AsyncLocal,
// so it can be cleared in all ExecutionContexts when its cleared.
_httpContextCurrent.Value = new HttpContextHolder { Context = value };
}
}
}
private class HttpContextHolder
{
public HttpContext Context;
}
}
}
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