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Home/ Questions/Q 4559960
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Editorial Team
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Editorial Team
Asked: May 21, 20262026-05-21T17:51:46+00:00 2026-05-21T17:51:46+00:00

This might seem like a silly question, but I downloaded the Reactive Extensions for

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This might seem like a silly question, but I downloaded the Reactive Extensions for .NET from here:
http://msdn.microsoft.com/en-us/devlabs/ee794896.aspx

This simple example is giving me a build error:

var test = new[] { 1, 2, 4, 5 };
test.ToObservable().Subscribe(Console.WriteLine);

The compiler says:

Error 2 The type
‘System.Concurrency.IScheduler’ is
defined in an assembly that is not
referenced. You must add a reference
to assembly ‘System.CoreEx,
Version=1.0.2856.104, Culture=neutral,
PublicKeyToken=31bf3856ad364e35’. C:\dev\test\RxTests.cs 67 13 Test

System.CoreEx is not on the same list of assemblies as System.Reactive was … any clues?

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1 Answer

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  1. Editorial Team
    Editorial Team
    2026-05-21T17:51:47+00:00Added an answer on May 21, 2026 at 5:51 pm

    In the latest version of Rx, System.CoreEx.dll has been removed and the contents merged with System.Reactive.dll. See the release notes for other changes.

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