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    <p>The principle idea of type forwarding is very well explained in <a href="https://stackoverflow.com/questions/4553463/what-is-the-correct-way-to-use-typeforwardedtoattribute">this</a> question and <a href="http://www.codeproject.com/Articles/67999/Forwarding-a-type-from-one-assembly-to-another-Typ" rel="nofollow noreferrer">this</a> article and I'm not repeating the details here. In summary, however, the idea is to be able to reuse a library <code>A</code> <strong>without</strong> recompiling, even though it references a library <code>B</code> that <strong>is being replaced</strong> by library <code>C</code>. To that end, library <code>B</code> has to be modified such that it forwards the reference to library <code>C</code>, which is exactly what the TypeForwardedTo attribute does.</p> <p>How does this help you? Well, you could create your <code>ShimLib</code> such that it is referenced by all your projects, but uses conditional compilation and type forwarding to link it to the framework libraries if they exist. Fortunately, <a href="https://stackoverflow.com/questions/3462419/compatibility-pack-for-backporting-new-net-framework-features">someone already did</a> <a href="https://github.com/theraot/Theraot" rel="nofollow noreferrer">that for you</a> :)</p> <p><strong>Edit</strong> in response to Matt's comment: You're right, I overlooked that Theraot doesn't fall back to the original implementation. And I guess that will be very hard to achieve without recompiling. The best you can do is probably to follow <a href="https://stackoverflow.com/questions/2923210/c-sharp-conditional-compilation-and-framework-targets">this</a> strategy, i.e. to have different build configurations for the different framework versions. That way, you can conditionally compile the <code>TypeForwardedToAttribute</code>. At least, this saves you from having to duplicate code. If you <strong>really</strong> don't want to distribute different versions of your code, you might implement a bootstraper that <a href="https://stackoverflow.com/questions/6899707/way-to-determine-framework-version-without-registry">determines the framework version</a> and loads the version of your assembly that has been compiled using the build configuration for this version</p>
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    1. POHow to use TypeForwardedTo in Portable Class Libraries?
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    1. COI get conceptually how the TypeForwardedTo attribute works, and yes I've gotten it to work in normal assemblies. The problem I'm having is combining that with Portable Class Libraries. Theraot is interesting, but it's not a PCL and it doesn't defer to the framework's implementation if it exists. It's creating libraries for specific versions of the framework. What I'm shooting for is like Microsoft.Bcl (http://www.nuget.org/packages/Microsoft.Bcl/) where Phone7 uses BCL's portable implementation of Task, but Phone8 and WinRuntime use the framework's implementation of Task
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      1. USMatt Dotson
    2. COThanks bigge. The different build configurations is close, but I can't change the target frameworks property of the PCL project per configuration. It's set once for the project regardless of the configuration. If I can't change the target framework to exclude WP7, then I get build errors because the compiler can't resolve System.Lazy in the TypeForwardedTo attribute. Perhaps creating multiple projects which generate the same assemblyname is the only strategy.
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    3. COMaybe this post can help you here: http://stackoverflow.com/questions/2923210/c-sharp-conditional-compilation-and-framework-targets/2928835#2928835
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