这使我今天很不舒服。当我演示Rx2.x的特性和功能时，我试图构建一个支持Nuget的项目，这个项目是我从另一台计算机复制的。

所有东西都下载正确，参考资料在那里！但我不能编译。

以下两个程序集导致了此问题。我想知道是否有人面临过将RX程序集重新插入.NET 4.5项目的问题。

system.reactive.windows.线程

Warning 11 The primary reference"System.Reactive.Windows.Threading,
Version=2.1.30214.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35,
processorArchitecture=MSIL" could not be resolved because it has an
indirect dependency on the framework assembly"System.Threading.Tasks,
Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
which could not be resolved in the currently targeted framework.
".NETFramework,Version=v4.5". To resolve this problem, either remove
the reference"System.Reactive.Windows.Threading, Version=2.1.30214.0,
Culture=neutral, PublicKeyToken=31bf3856ad364e35,
processorArchitecture=MSIL" or retarget your application to a
framework version which contains"System.Threading.Tasks,
Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a".

和System.Reactive.PlatformServices

Warning 26 The primary reference"System.Reactive.PlatformServices"
could not be resolved because it has an indirect dependency on the
framework assembly"System.Runtime.Extensions, Version=4.0.0.0,
Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" which could not be
resolved in the currently targeted framework.
".NETFramework,Version=v4.5". To resolve this problem, either remove
the reference"System.Reactive.PlatformServices" or retarget your
application to a framework version which contains
"System.Runtime.Extensions, Version=4.0.0.0, Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a".

无法编译：

Error 73 The type or namespace name 'IScheduler' could not be found
(are you missing a using directive or an assembly
reference?)
Error 74 The type or namespace name 'CompositeDisposable' could not be
found (are you missing a using directive or an assembly
reference?)

我的通灵调试器说，这与在项目中混合对.NET 4.0和.NET 4.5 RX DLL的引用或Microsoft.bcl.async有关。