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PONull reference exception using HttpClient with async/await in MVC 4 application
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  1. PONull reference exception using HttpClient with async/await in MVC 4 application
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    copied!<p>I am using HttpClient to call a REST API. HttpClient.GetAsync method works fine if I call it from a test project. But calling HttpClient.GetAsync() from an MVC 4 application throws an unhandled object reference not set exception with the following stack trace:</p> <pre><code>at System.Web.ThreadContext.AssociateWithCurrentThread(Boolean setImpersonationContext) at System.Web.HttpApplication.OnThreadEnterPrivate(Boolean setImpersonationContext) at System.Web.LegacyAspNetSynchronizationContext.CallCallbackPossiblyUnderLock(SendOrPostCallback callback, Object state) at System.Web.LegacyAspNetSynchronizationContext.CallCallback(SendOrPostCallback callback, Object state) at System.Web.LegacyAspNetSynchronizationContext.Post(SendOrPostCallback callback, Object state) at System.Threading.Tasks.SynchronizationContextAwaitTaskContinuation.PostAction(Object state) at System.Threading.Tasks.AwaitTaskContinuation.RunCallback(ContextCallback callback, Object state, Task&amp; currentTask) --- End of stack trace from previous location where exception was thrown --- at System.Threading.Tasks.AwaitTaskContinuation.&lt;ThrowAsyncIfNecessary&gt;b__1(Object s) at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(Object state) at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem() at System.Threading.ThreadPoolWorkQueue.Dispatch() at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback() </code></pre> <p>I am running .NET Framework 4.5. Any idea how to fix it.</p>
 

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