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    <p>I thought I would quickly share my approach in case anyone ever needs to do that or something similar again, as the problems will be common to other native C++ libraries in Azure.</p> <p>The problem was to do with a number of things: Azure not having all the VC++ runtime dlls needed by Z3; the Z3 install not including its other dependencies in its bin; Silverlight RIA Services failing to compile if there are any 64bit dlls either in the solution or in the bin folder; Azure not running the 32bit version of the Z3 dll; Azure not having the F# runtime, etc..</p> <p>This is how I got it working:</p> <ol> <li><p>Abstract out an interface for the code that calls Z3 (In my case, having an IXxxAnalyzer interface in XxxAnalyzerCommon.dll)</p></li> <li><p>Don’t add the concrete F# implementation of this interface directly into the solution either as a reference, content, or resource. </p></li> <li><p>Instead, use a .NET zip library to package:</p> <pre><code> a. XxxAnalyzer64.dll (64bit version of the F# implementation of IXxxAnalyzer) b. XxxAnalyzerCommon.dll c. FSharp.Core.dll d. FSharp.PowerPack.dll e. Microsoft.Z3.dll (64bit version) </code></pre></li> <li><p>Add the zip as content to the web project</p></li> <li><p>Add the VC++ redistributable (64bit) vcredist_x64.exe as content to the web project</p></li> <li><p>Create an Azure startup task that silently installs the VC++ redist when its first deployed.</p></li> <li><p>Create an Azure Local Storage Resource in your role configuration</p></li> <li><p>At startup, extract the zip to the local storage (if it’s not already there)</p></li> <li><p>Use MEF (the Managed Extensibility Framework) to dynamically import the concrete IAnalyzer by using a DirectoryCatalog pointing at the local storage – so the project doesn’t need to have any direct reference or dependency on XxxAnalyzer64.dll.</p></li> </ol> <p>There was also a problem with the FSharp.PowerPack.dll strongly referencing an earlier version of FSharp.Core.dll, which I had to use an Assembly Redirect statement in the web.config to resolve.</p>
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    1. POReferencing a 64bit dll in the web app of a WCF RIA Services app hosted in Azure
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    1. COJust to add that I would not put any zip/exe/installables in my project and being part of my deployment. I would rather put them in a Blob storage, and use the Azure Bootstrapper (http://bootstrap.codeplex.com/) to download / unzip / install from a startup task.
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