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POHttpContext.Current.Items after an Async operation
 

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    <p>Consider the following ASP.NET Web API Delegating Handler: </p> <pre><code>public class MyHandler : DelegatingHandler { protected async override Task&lt;HttpResponseMessage&gt; SendAsync(HttpRequestMessage request, System.Threading.CancellationToken cancellationToken) { var guid = Guid.NewGuid(); HttpContext.Current.Items["foo"] = guid; // An Async operation var result = await base.SendAsync(request, cancellationToken); //All code from this point is not gauranteed to run on the same thread that started the handler var restoredGuid = (Guid)HttpContext.Current.Items["foo"]; //Is this gauranteed to be true var areTheSame = guid == restoredGuid; return result; } } </code></pre> <p>The above example is in a delegating handler, the same problem I am trying to fix applies in Controllers, Business Objects, etc.</p> <p>I am ultimately trying to provide some simple in-memory shared state between various objects per HTTP Request</p> <p>As I understand it during Async operations the ASP.NET thread originally running the operation is returned to the thread pool and a different thread may be used to finish the request after the Async operation has completed.</p> <p>Does this affect the <code>HttpContext.Current.Items</code> collection? Is an item that was in the <code>Items</code> collection guaranteed to be there when the Request resumes?</p> <ol> <li><p>I'm aware that using <code>HttpContext.Current</code> is often frowned upon by the wider community these days for reasons I completely agree with... I'm just helping someone out of a jam.</p></li> <li><p>Storing this data in the <code>Request.Items</code> collection is not suitable to solve this problem as my colleague requires a static due to some poor design decisions.</p></li> </ol> <p>Many Thanks</p>
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    1. USGavin Osborn
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    1. COThis might help : http://stackoverflow.com/questions/17261571/is-httpcontext-current-items-thread-safe-between-requests
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      1. USJason Evans
    2. COand this : http://stackoverflow.com/questions/15196556/httpcontext-current-items-in-different-thread
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    3. COHi Jason, those questions; whilst similar; are not quite the same thing. Thanks though.
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