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POExceptions in F# when running on Azure
 

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  1. POExceptions in F# when running on Azure
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    <p>We have a C# web role running in Azure, and the C# project invokes code in an F# dll that we deploy with our app. </p> <p>When we’re running locally using the local Azure emulator, our F# code is invoked and runs fine. When it’s running in Azure in the cloud, our F# code fails at a certain point with this exception:</p> <blockquote> <p>Failed to parse x's function: var(2).Exception: System.IO.FileNotFoundException: Could not load file or assembly 'FSharp.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified. File name: 'FSharp.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'<br> at Microsoft.FSharp.Text.Lexing.LexBuffer<code>1.FromArray(char[] s) at Microsoft.FSharp.Text.Lexing.LexBuffer</code>1.FromString(String s) at Marshal.vars@27.GenerateNext(IEnumerable`1&amp; next)<br> WRN: Assembly binding logging is turned OFF. To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1. Note: There is some performance penalty associated with assembly bind failure logging. To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog]. .Will use default function.</p> </blockquote> <p>We have found some posts that suggest it’s because :</p> <blockquote> <p>Windows Azure runs applications in partial trust, as part of sandboxing their execution. However, the F# core libraries are currently installed into the GAC, but do not have the AllowPartialTrustedCallers attribute. So when building F# applications to be run in Azure, the F# libraries must be statically linked using --standalone. The provided templates take care of this, but you'll notice the following side-affects: • Longer than usual compile times • Large set of references • A dummy reference to "RDManaged.dll"</p> <p><a href="http://archive.msdn.microsoft.com/fsharpazure" rel="nofollow">http://archive.msdn.microsoft.com/fsharpazure</a></p> </blockquote> <p>To try to get round this, we follow the advice below and put the <code>–standalone</code> flag in the Build config of our F# library.</p> <p><a href="http://www.42spikes.com/post/F-and-Azure.aspx" rel="nofollow">http://www.42spikes.com/post/F-and-Azure.aspx</a></p> <p>However, the F# library doesn’t compile with this flag. We get this build error:</p> <blockquote> <p>Error 3 A problem occurred writing the binary 'obj\Debug\Analyzer.dll': Error in pass2 for type Microsoft.FSharp.Text.StructuredFormat.Joint, error: One of your modules expects the type 'System.Collections.IStructuralEquatable' to be defined within the module being emitted. You may be missing an input file FSC 1 1<br> Analyzer</p> </blockquote> <p>Could this build error be because of the dependencies our F# project has? It references FSharp.PowerPack.dll and Microsoft.Z3.dll, as well as another C# library in our solution, AnalyzerCommon.dll (which just contains a common interface that both our F# and C# code implement).</p> <p>It's interesting that the F# code is called and runs fine, it's only until it hits a certain part of the code - a formula parser that uses FSharp.PowerPack.dll.</p> <p>Any tips would be greatly appreciated.</p> <p>Thanks, Sam</p>
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    1. CODid you put `FSharp.Core.dll` along with all the dependencies (I don't know where, since I haven't used Azure). It won't be there by default. There are several annoying bugs with F# static-linking (and so also with `standalone` flag). Try to solve this without static-linking.
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    2. COYes I have, thanks. And see my comment below.. it may around versions of FSharp.Core.dll.. thanks
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