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• FSharp.Core.sigdata not found alongside FSharp.Core

  - by Mauricio Scheffer

  I'm trying to use F# for an ASP.NET MVC application. One my controller actions sends an F# list to the view, so I write: <%@ Page Language="C#" Inherits="ViewPage<FSharpList<int>>" %> Of course, for this to work, I have to add Microsoft.FSharp.Collections to the namespaces element in my web.config: <add namespace="Microsoft.FSharp.Collections"/> and add a reference to FSharp.Core, in the assemblies element: <add assembly="FSharp.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/> As soon as I add this assembly reference, every view (whether it uses an F# type or not) fails with this error: error FS1221: FSharp.Core.sigdata not found alongside FSharp.Core I can work around this by not having any F# specific types in my views, but what's the reason for this error? Also, where's FSharp.Core.sigdata ? It's not in my GAC and I can't find it anywhere.

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• F# Powerpack's Metadata doesn't recognize FSharp.Core as an F# library

  - by Nathan Sanders

  Here's my test code to isolate the problem: open Microsoft.FSharp.Metadata [<EntryPoint>] let main args = let core = FSharpAssembly.FromFile @"C:\Program Files\FSharp-2.0.0.0\\bin\FSharp.Core.dll" let core2 = FSharpAssembly.FSharpLibrary let core3 = System.AppDomain.CurrentDomain.GetAssemblies() |> Seq.find (fun a -> a.FullName.Contains "Core") |> FSharpAssembly.FromAssembly core.Entities |> Seq.iter (printfn "%A") 0 All three lets should give me the same FSharpAssembly. Instead, all 3 throw an exception that FSharp.Core is not an F# assembly (details below, re-formatted for readability). Two more clues: Using the core3 method, I get the same error for the test F# assembly itself I don't get the error at FSI after doing #r "@C:\Program Files...\FSharp.Powerpack.Metadata.dll". Any ideas? I'm using Visual Studio 2008, F# 2.0 and F# Powerpack 2.0.0.0 (May 20, 2010) release on an oldish XP VM, I think it's updated to SP3 though. (I got the error this morning with Powerpack 1.9.9.9, so I upgraded to 2.0.0.0. I thought that if 1.9.9.9 doesn't recognise F#'s 2.0.0.0's assemblies, then maybe bugfixes in Powerpack 2.0.0.0 would help.) Unhandled Exception: System.TypeInitializationException: The type initializer for 'Microsoft.FSharp.Metadata.AssemblyLoader' threw an exception. ---> System.TypeInitializationException: The type initializer for '<StartupCode$FSharp-PowerPack-Metadata>.$Metadata' threw an exception. ---> System.ArgumentException: could not produce an FSharpAssembly object for the assembly 'FSharp.Core' because this is not an F# assembly Parameter name: name at Microsoft.FSharp.Metadata.AssemblyLoader.Add(String name,Assembly assembly) at <StartupCode$FSharp-PowerPack-Metadata>.$Metadata..cctor() --- End of inner exception stack trace --- at Microsoft.FSharp.Metadata.AssemblyLoader..cctor() --- End of inner exception stack trace --- at Microsoft.FSharp.Metadata.AssemblyLoader.Get(Assembly assembly) at Microsoft.FSharp.Metadata.FSharpAssembly.FromAssembly(Assembly assembly) at Program.main(String[] args) in C:\Documents an...\FSMetadataTest\Program.fs:line 11 Press any key to continue . . .

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• Nasty mono bug with F#

  - by Aurimas Anskaitis

  Hi, I have this monstrous f# 2.0 program My mono version is Mono JIT compiler version 2.9 (master/f593354 Sun Dec 26 03:15:55 EET 2010) Copyright (C) 2002-2010 Novell, Inc and Contributors. www.mono-project.com TLS: __thread SIGSEGV: altstack Notifications: epoll Architecture: x86 Disabled: none Misc: softdebug LLVM: supported, not enabled. GC: Included Boehm (with typed GC and Parallel Mark) //--------------------------------------------- module Main let rec gcd x y = if y = 0 then x else gcd y (x%y) let main = printfn "%i" (gcd 4 2) main //----------------------------------------------- And the problem is that output from running the program is as follows: Stacktrace: at (wrapper managed-to-native) System.Reflection.MonoMethodInfo.get_parameter_info (intptr,System.Reflection.MemberInfo) <0xffffffff at System.Reflection.MonoMethodInfo.GetParametersInfo (intptr,System.Reflection.MemberInfo) <0x00013 at System.Reflection.MonoCMethod.GetParameters () <0x00015 at System.Reflection.MonoCMethod.Invoke (object,System.Reflection.BindingFlags,System.Reflection.Binder,object[],System.Globalization.CultureInfo) <0x00035 at System.Reflection.MonoCMethod.Invoke (System.Reflection.BindingFlags,System.Reflection.Binder,object[],System.Globalization.CultureInfo) <0x00024 at System.Reflection.ConstructorInfo.Invoke (object[]) <0x0003f at System.Activator.CreateInstance (System.Type,bool) <0x0017c at System.Activator.CreateInstance (System.Type) <0x00012 at Microsoft.FSharp.Reflection.FSharpValue.MakeFunction (System.Type,Microsoft.FSharp.Core.FSharpFunc2<object, object>) <0x00145> at Microsoft.FSharp.Core.PrintfImpl.capture@529<b, c, d> (Microsoft.FSharp.Core.FSharpFunc2, Microsoft.FSharp.Core.FSharpFunc`2<char, Microsoft.FSharp.Core.Unit>, Microsoft.FSharp.Core.FSharpFunc`2,string,int,Microsoft.FSharp.Collections.FSharpList1<object>,System.Type,int) <0x00147> at Microsoft.FSharp.Core.PrintfImpl.gprintf<b, c, d, a> (Microsoft.FSharp.Core.FSharpFunc2, Microsoft.FSharp.Core.FSharpFunc`2<char, Microsoft.FSharp.Core.Unit>, Microsoft.FSharp.Core.FSharpFunc`2,Microsoft.FSharp.Core.PrintfFormat4<a, b, c, d>) <0x000dd> at Microsoft.FSharp.Core.PrintfModule.kprintf_imperative<a, b, c> (Microsoft.FSharp.Core.FSharpFunc2,b,Microsoft.FSharp.Core.FSharpFunc2<char, Microsoft.FSharp.Core.Unit>,Microsoft.FSharp.Core.PrintfFormat4) <0x00058 at Microsoft.FSharp.Core.PrintfModule.PrintFormatToTextWriterThen (Microsoft.FSharp.Core.FSharpFunc2<Microsoft.FSharp.Core.Unit, TResult>,System.IO.TextWriter,Microsoft.FSharp.Core.PrintfFormat4) <0x0004d at Microsoft.FSharp.Core.PrintfModule.PrintFormatLineToTextWriter (System.IO.TextWriter,Microsoft.FSharp.Core.PrintfFormat`4) <0x0004d at .$Main.main@ () <0x00042 Native stacktrace: mono() [0x80dc13b] mono() [0x811c65b] mono() [0x8059a11] [0x7af40c] mono() [0x8228214] mono() [0x8228214] mono() [0x8228214] mono() [0x8228214] mono() [0x8228214] mono() [0x8228214] mono() [0x8228214] mono() [0x8228214] mono() [0x8228282] mono() [0x822991e] mono() [0x822aa9d] mono(mono_array_new_specific+0xea) [0x813ba9a] mono() [0x81c63a1] mono() [0x8149ac8] [0xc04328] [0xc042e4] [0xc042be] [0xc0455e] [0xc0451d] [0xc044d8] [0xc0349d] [0xc0330b] [0xc02f9e] [0xbfe960] [0xbfe6c6] [0xbfe571] [0xbfe4de] [0xbfe44e] [0xbf9d2b] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] 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If your uid matches the uid of the target process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try again as the root user. For more details, see /etc/sysctl.d/10-ptrace.conf ptrace: Operation not permitted. ================================================================= Got a SIGSEGV while executing native code. This usually indicates a fatal error in the mono runtime or one of the native libraries used by your application. Aborted It is a huge problem with mono or f#? By the way, the same function works when using pattern matching instead of "if".

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• FSharp.Compiler.CodeDom for VS2008 and VS2010 side-by-side

  - by SztupY

  I'm using FSharp.Compiler.CodeDom to dynamically create F# classes. The problem is, that I have both VS2008 and VS2010 on my computer side-by-side (they works fine), and using F# in this configuration is buggy at best: If I don't install InstallFSharp.msi, then under VS2008 the built classes complain about not finding FSharp.Core (even if they're referenced) If I install InstallFSharp.msi, then under VS2008 the built classes will use the F# built for VS2010, and will throw a binary-incompatibility exception, because it will load the .net4 variant: FSC: error FS0219: The referenced or default base CLI library 'mscorlib' is binary- incompatible with the referenced F# core library 'C:\Program Files (x86)\Microsoft F#\v4.0\FSharp.Core.dll'. Consider recompiling the library or making an explicit reference to a version of this library that matches the CLI version you are using. If I replace the F# found at the previous location to the separately installed dll-s, then of course VS2010 will complain about binary-incompatibility Am I overlooking something, or they won't simply work for a shared environment like this? This might mean real problems when I deploy the applications. Thanks

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• Could not load file or assembly FSharp.Core, Version=4.0.0.0

  - by Ken

  I'm trying to deploy a web application which uses F# 4.0 on Windows Server 2008. It works on my computer where VS2010 is installed but it doesn't work on the server. Everytime you open the page you'll get this error message: Could not load file or assembly 'FSharp.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified. I've installed .NET 4 using the web platform installer. F# PowerPack is installed too. I found this page: http://connect.microsoft.com/VisualStudio/feedback/details/507202/error-in-working-with-f It suggests you to reinstall F#, but the link to download F# seems to be broken. And it might not be the same problem I have. I've also tried to install Microsoft F# 2.0.0.0 since it's the only F# redistribution I could find. But it doesn't help at all. Has anyone get something like this to work? Any help would be appreciated. Thanks.

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• How to define type member constant in F# ?

  - by zproxy

  In C# one can define a type member constant like this: class Foo { public const int Bar = 600; } The IL shall looks like this. .field public static literal int32 Bar = int32(600) How can I do the same within Visual F# / FSharp? I tried this to no avail: [<Sealed>] type Foo() = [<Literal>] let Bar = 600

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• Problem with script substitution when running script

  - by tucaz

  Hi! I'm new to Linux so this probably should be an easy fix, but I cannot see it. I have a script downloaded from official sources that is used to install additional tools for fsharp but it gives me a syntax error when running it. I tried to replace ( and ) by { and } but eventually it lead me to another error so I think this is not the problem since the script works for everybody. I read some articles that say that my bash version maybe is not the right one. I'm using Ubuntu 10.10 and here is the error: install-bonus.sh: 28: Syntax error: "(" unexpected (expecting "}") And this is line 27, 28 and 29: { declare -a DIRS=("${!3}") FILE=$2 And the full script: #! /bin/sh -e PREFIX=/usr BIN=$PREFIX/bin MAN=$PREFIX/share/man/man1/ die() { echo "$1" &2 echo "Installation aborted." &2 exit 1 } echo "This script will install additional material for F# including" echo "man pages, fsharpc and fsharpi scripts and Gtk# support for F#" echo "Interactive (root access needed)" echo "" # ------------------------------------------------------------------------------ # Utility function that searches specified directories for a specified file # and if the file is not found, it asks user to provide a directory RESULT="" searchpaths() { declare -a DIRS=("${!3}") FILE=$2 DIR=${DIRS[0]} for TRYDIR in ${DIRS[@]} do if [ -f $TRYDIR/$FILE ] then DIR=$TRYDIR fi done while [ ! -f $DIR/$FILE ] do echo "File '$FILE' was not found in any of ${DIRS[@]}. Please enter $1 installation directory:" read DIR done RESULT=$DIR } # ------------------------------------------------------------------------------ # Locate F# installation directory - this is needed, because we want to # add environment variable with it, generate 'fsharpc' and 'fsharpi' and also # copy load-gtk.fsx to that directory # ------------------------------------------------------------------------------ PATHS=( $1 /usr/lib/fsharp /usr/lib/shared/fsharp ) searchpaths "F# installation" FSharp.Core.dll PATHS[@] FSHARPDIR=$RESULT echo "Successfully found F# installation directory." # ------------------------------------------------------------------------------ # Check that we have everything we need # ------------------------------------------------------------------------------ [ $(id -u) -eq 0 ] || die "Please run the script as root." which mono /dev/null || die "mono not found in PATH." # ------------------------------------------------------------------------------ # Make sure that all additional assemblies are in GAC # ------------------------------------------------------------------------------ echo "Installing additional F# assemblies to the GAC" gacutil -i $FSHARPDIR/FSharp.Build.dll gacutil -i $FSHARPDIR/FSharp.Compiler.dll gacutil -i $FSHARPDIR/FSharp.Compiler.Interactive.Settings.dll gacutil -i $FSHARPDIR/FSharp.Compiler.Server.Shared.dll # ------------------------------------------------------------------------------ # Install additional files # ------------------------------------------------------------------------------ # Install man pages echo "Installing additional F# commands, scripts and man pages" mkdir -p $MAN cp *.1 $MAN # Export the FSHARP_COMPILER_BIN environment variable if [[ ! "$OSTYPE" =~ "darwin" ]]; then echo "export FSHARP_COMPILER_BIN=$FSHARPDIR" fsharp.sh mv fsharp.sh /etc/profile.d/ fi # Generate 'load-gtk.fsx' script for F# Interactive (ask user if we cannot find binaries) PATHS=( /usr/lib/mono/gtk-sharp-2.0 /usr/lib/cli/gtk-sharp-2.0 /Library/Frameworks/Mono.framework/Versions/2.8/lib/mono/gtk-sharp-2.0 ) searchpaths "Gtk#" gtk-sharp.dll PATHS[@] GTKDIR=$RESULT echo "Successfully found Gtk# root directory." PATHS=( /usr/lib/mono/gtk-sharp-2.0 /usr/lib/cli/glib-sharp-2.0 /Library/Frameworks/Mono.framework/Versions/2.8/lib/mono/gtk-sharp-2.0 ) searchpaths "Glib" glib-sharp.dll PATHS[@] GLIBDIR=$RESULT echo "Successfully found Glib# root directory." PATHS=( /usr/lib/mono/gtk-sharp-2.0 /usr/lib/cli/atk-sharp-2.0 /Library/Frameworks/Mono.framework/Versions/2.8/lib/mono/gtk-sharp-2.0 ) searchpaths "Atk#" atk-sharp.dll PATHS[@] ATKDIR=$RESULT echo "Successfully found Atk# root directory." PATHS=( /usr/lib/mono/gtk-sharp-2.0 /usr/lib/cli/gdk-sharp-2.0 /Library/Frameworks/Mono.framework/Versions/2.8/lib/mono/gtk-sharp-2.0 ) searchpaths "Gdk#" gdk-sharp.dll PATHS[@] GDKDIR=$RESULT echo "Successfully found Gdk# root directory." cp bonus/load-gtk.fsx load-gtk1.fsx sed "s,INSERTGTKPATH,$GTKDIR,g" load-gtk1.fsx load-gtk2.fsx sed "s,INSERTGDKPATH,$GDKDIR,g" load-gtk2.fsx load-gtk3.fsx sed "s,INSERTATKPATH,$ATKDIR,g" load-gtk3.fsx load-gtk4.fsx sed "s,INSERTGLIBPATH,$GLIBDIR,g" load-gtk4.fsx load-gtk.fsx rm load-gtk1.fsx rm load-gtk2.fsx rm load-gtk3.fsx rm load-gtk4.fsx mv load-gtk.fsx $FSHARPDIR/load-gtk.fsx # Generate 'fsharpc' and 'fsharpi' scripts (using the F# path) # 'fsharpi' automatically searches F# root directory (e.g. load-gtk) echo "#!/bin/sh" fsharpc echo "exec mono $FSHARPDIR/fsc.exe --resident \"\$@\"" fsharpc chmod 755 fsharpc echo "#!/bin/sh" fsharpi echo "exec mono $FSHARPDIR/fsi.exe -I:\"$FSHARPDIR\" \"\$@\"" fsharpi chmod 755 fsharpi mv fsharpc $BIN/fsharpc mv fsharpi $BIN/fsharpi Thanks a lot!

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• How can I return a Dictionary from F# to C# without having to include FSharp.Core?

  - by Benjol

  I'm trying to return a IDictionary<int,int> (created with dict tuplist) from F# to C#, but it says that I must include a reference to FSharp.Core because of System.Collections.IStructuralEquatable. I've tried returning a Dictionary<_,_>(dict tuplist), but that doesn't make any difference. I even tried Dictionary<_,_>(dict tuplist, HashIdentity.Reference), but that says that int is a struct...

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• Creating my first F# program in my new &ldquo;Expert F# Book&rdquo;

  - by MarkPearl

  So I have a brief hour or so that I can dedicate today to reading my F# book. It’s a public holiday and my wife’s birthday and I have a ton of assignments for UNISA that I need to complete – but I just had to try something in F#. So I read chapter 1 – pretty much an introduction to the rest of the book – it looks good so far. Then I get to chapter 2, called “Getting Started with F# and .NET”. Great, there is a code sample on the first page of the chapter. So I open up VS2010 and create a new F# console project and type in the code which was meant to analyze a string for duplicate words… #light let wordCount text = let words = Split [' '] text let wordset = Set.ofList words let nWords = words.Length let nDups = words.Length - wordSet.Count (nWords, nDups) let showWordCount text = let nWords,nDups = wordCount text printfn "--> %d words in text" nWords printfn "--> %d duplicate words" nDups   So… bad start - VS does not like the “Split” method. It gives me an error message “The value constructor ‘Split’ is not defined”. It also doesn’t like wordSet.Count telling me that the “namespace or module ‘wordSet’ is not defined”. ??? So a bit of googling and it turns out that there was a bit of shuffling of libraries between the CTP of F# and the Beta 2 of F#. To have access to the Split function you need to download the F# PowerPack and hen reference it in your code… I download and install the powerpack and then add the reference to FSharp.Core and FSharp.PowerPack in my project. Still no luck! Some more googling and I get the suggestions I got were something like this…#r "FSharp.PowerPack.dll";; #r "FSharp.PowerPack.Compatibility.dll";; So I add the code above to the top of my Program.fs file and still no joy… I now get an error message saying… Error    1    #r directives may only occur in F# script files (extensions .fsx or .fsscript). Either move this code to a script file, add a '-r' compiler option for this reference or delimit the directive with '#if INTERACTIVE'/'#endif'. So what does that mean? If I put the code straight into the F# interactive it works – but I want to be able to use it in a project. The C# equivalent I would think would be the “Using” keyword. The #r doesn’t seem like it should be in the FSharp code. So I try what the compiler suggests by doing the following…#if INTERACTIVE #r "FSharp.PowerPack.dll";; #r "FSharp.PowerPack.Compatibility.dll";; #endif No luck, the Split method is still not recognized. So wait a second, it mentioned something about FSharp.PowerPack.Compatibility.dll – I haven’t added this as a reference to my project so I add it and remove the two lines of #r code. Partial success – the Split method is now recognized and not underlined, but wordSet.Count is still not working. I look at my code again and it was a case error – the original wordset was mistyped comapred to the wordSet. Some case correction and the compiler is no longer complaining. So the code now seems to work… listed below…#light let wordCount text = let words = String.split [' '] text let wordSet = Set.ofList words let nWords = words.Length let nDups = words.Length - wordSet.Count (nWords, nDups) let showWordCount text = let nWords,nDups = wordCount text printfn "--> %d words in text" nWords printfn "--> %d duplicate words" nDups  So recap – if I wanted to use the interactive compiler then I need to put the #r code. In my mind this is the equivalent of me adding the the references to my project. If however I want to use the powerpack in a project – I just need to make sure that the correct references are there. I feel like a noob once again!

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• F#'s fshtmldoc.exe using Mono/OS X

  - by John Clements

  This is doubtless something obvious, but downloading the F# PowerPack from codeplex and running fshtmldoc produces this error: clements$ mono ./fshtmldoc.exe FSharp.PowerPack.dll Processing 'FSharp.PowerPack.dll'... Unexpected failure while writing HTML docs: An exception was thrown by the type initializer for Microsoft.FSharp.Metadata.AssemblyLoader This is using mono 2.6.3, F# 2.0 1.9.9.9, & OS X 10.6.3 on a 32-bit intel processor. Any help would be appreciated. Many thanks, John Clements (repost from powerpack online discussion group--no response there)

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• Getting F# on Ubuntu 10.04

  - by Bo Tian

  I followed this to get F# on my Ubuntu machine. However, it returned me an error, saying -- Resigning FSharp.Core.dll with mono.snk ./install-mono.sh: 24: sn: not found -- Installing FSharp DLLS into the GAC Failure adding assembly bin/FSharp.Core.dll to the cache: Strong name cannot be verified for delay-signed assembly

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• Microsoft F#

  - by Aamir Hasan

  F# brings you type safe, succinct, efficient and expressive functional programming language on the .NET platform. It is a simple and pragmatic language, and has particular strengths in data-oriented programming, parallel I/O programming, parallel CPU programming, scripting and algorithmic development. F# cannot solve any problem C# could. F# is a functional language, statically typed. F# is a functional language that supports O-O-Programming References:http://msdn.microsoft.com/en-us/fsharp/cc835246.aspx http://research.microsoft.com/en-us/um/cambridge/projects/fsharp/

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• NDjango throws TypeLoadException

  - by user303754

  Hi All, I'm just trying to get started with NDjango but am having issues running a basic test app. When running the page in either debug or release the following exception is thrown: Could not load type 'Microsoft.FSharp.Core.CompilerMessageAttribute' from assembly 'FSharp.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. This is thrown when the NDjangoHandle is created in the HttpApplication ctor. The fsharp assemblies are definitely all there in the gac (and they seem to be distributed with NDjango too) so I'm a bit confused about this one. Googling this turns up zip. I'm using NDjango 0.9.7.0 for .NET 4.0 in vis studio 2010 Cheers

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• How to JSON serialize math vector type in F#?

  - by The_Ghost

  Hello! I'm trying to serialize "vector" (Microsoft.FSharp.Math) type. And I get that error: Exception Details: System.Runtime.Serialization.SerializationException: Type 'Microsoft.FSharp.Math.Instances+FloatNumerics@115' with data contract name 'Instances.FloatNumerics_x0040_115:http://schemas.datacontract.org/2004/07/Microsoft.FSharp.Math' is not expected. Add any types not known statically to the list of known types - for example, by using the KnownTypeAttribute attribute or by adding them to the list of known types passed to DataContractSerializer. I have tried to put KnownType attribute and some other stuff, but nothing helps! Could someone know the answer? This is the code I use: // [< KnownType( typeof<vector> ) >] type MyType = vector let public writeTest = let aaa = vector [1.1;2.2] let serializer = new DataContractJsonSerializer( typeof<MyType> ) let writer = new StreamWriter( @"c:\test.txt" ) serializer.WriteObject(writer.BaseStream, aaa) writer.Close()

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• F# PowerPack 2.0.0.0 issue: The task ..."…\fslex.exe" is invalid

  - by Roman Kuzmin

  I have upgraded F# PowerPack today to the latest 2.0.0.0 and tried to rebuild the MiniCalc sample from here: http://achrissmith.blogspot.com/2010/04/fslex-and-fsyacc-examples-updated.html If I build it in VS 2010 it fails with the message: C:\Program Files\MSBuild\FSharp\1.0\FSharp.PowerPack.targets(32,3): error MSB6004: The specified task executable location "C:\Program Files\Microsoft Visual Studio 10.0\Common7\IDE\fslex.exe" is invalid. If I build it from the command line by MSBuild it complains about missing C:\Windows\Microsoft.NET\Framework\v4.0.30319\fslex.exe The problem is kind of “fixed” if I copy fslex and fsyacc to that both directories, so after that I can build from the command line and from VS 2010. But it does not look like a right way to solve the problem. What is the right way? EDIT: The same issue is true for the PowerPack sample from sources: May2010\workyard\tests\LexAndYaccMiniProject. Now (after the trick I have done) it is built fine, too.

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• How to Get the F# Name of a Module, Function, etc. From Quoted Expression Match

  - by Stephen Swensen

  I continue to work on a printer for F# quoted expressions, it doesn't have to be perfect, but I'd like to see what is possible. The active patterns in Microsoft.FSharp.Quotations.Patterns and Microsoft.FSharp.Quotations.DerivedPatterns used for decomposing quoted expressions will typically provide MemberInfo instances when appropriate, these can be used to obtain the name of a property, function, etc. and their "declaring" type, such as a module or static class. The problem is, I only know how to obtain the CompiledName from these instances but I'd like the F# name. For example, > <@ List.mapi (fun i j -> i+j) [1;2;3] @> |> (function Call(_,mi,_) -> mi.DeclaringType.Name, mi.Name);; val it : string * string = ("ListModule", "MapIndexed") How can this match be rewritten to return ("List", "mapi")? Is it possible?

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• Integrating F# in SharpDevelop

  - by Marko Apfel

  After installing SharpDevelop 4 the F# Interactive could not be activated. In my case the correct folder for the F# installation must by specified in die application config file. So i opened SharpDevelop.exe.config and set this entry in the appSettings section: <add key="alt_fs_bin_path" value="C:\Program Files\FSharp\bin" />

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• F#, Linux and makefiles

  - by rwallace

  I intend to distribute an F# program as both binary and source so the user has the option of recompiling it if desired. On Windows, I understand how to do this: provide .fsproj and .sln files, which both Visual Studio and MSBuild can understand. On Linux, the traditional solution for C programs is a makefile. This depends on gcc being directly available, which it always is. The F# compiler can be installed on Linux and works under Mono, so that's fine so far. However, as far as I can tell, it doesn't create a scenario where fsc runs the compiler, instead the command is mono ...path.../fsc.exe. This is also fine, except I don't know what the path is going to be. So the full command to run the compiler in my case could be mono ~/FSharp-2.0.0.0/bin/fsc.exe types.fs tptp.fs main.fs -r FSharp.PowerPack.dll except that I'm not sure where fsc.exe will actually be located on the user's machine. Is there a way to find that out within a makefile, or would it be better to fall back on just explaining the above in the documentation and relying on the user to modify the command according to his setup?

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• F# numeric associations

  - by b1g3ar5

  I have a numeric association for a custom type as follows: let DiffNumerics = { new INumeric<Diff> with member op.Zero = C 0.0 member op.One = C 1.0 member op.Add(a,b) = a + b member op.Subtract(a,b) = a - b member op.Multiply(a,b) = a * b member ops.Negate(a) = Diff.negate a member ops.Abs(a) = Diff.abs a member ops.Equals(a, b) = ((=) a b) member ops.Compare(a, b) = Diff.compare a b member ops.Sign(a) = int (Diff.sign a).Val member ops.ToString(x,fmt,fmtprovider) = failwith "not implemented" member ops.Parse(s,numstyle,fmtprovider) = failwith "not implemented" } GlobalAssociations.RegisterNumericAssociation(DiffNumerics) It works fine in f# interactive, but crashes when I run, because .ElementOps is not filled correctly for a matrix of these types. Any ideas why this might be? EDIT: In fsi, the code let A = dmatrix [[Diff.C 1.;Diff.C 2.;Diff.C 3.];[Diff.C 4.;Diff.C 5.;Diff.C 6.]] let B = matrix [[1.;2.;3.];[4.;5.;6.]] gives: > A.ElementOps;; val it : INumeric<Diff> = FSI_0003.NewAD+DiffNumerics@258 > B.ElementOps;; val it : INumeric<float> = Microsoft.FSharp.Math.Instances+FloatNumerics@115 > in the debugger A.ElementOps shows: '(A).ElementOps' threw an exception of type 'System.NotSupportedException' and, for the B matrix: Microsoft.FSharp.Math.Instances+FloatNumerics@115 So somehow the DiffNumerics isn't making it to the compiled program.

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• CodePlex Daily Summary for Friday, June 15, 2012

  CodePlex Daily Summary for Friday, June 15, 2012Popular ReleasesStackBuilder: StackBuilder 1.0.8.0: + Corrected a few bugs in batch processor + Corrected a bug in layer thumbnail generatorAutoUpdaterdotNET : Autoupdate for VB.NET and C# Developer: AutoUpdater.NET 1.1: Release Notes *New feature added that allows user to select remind later interval.SharePoint KnowledgeBase (ISC 2012): ISC.KBase.Advanced: A full-trust version of the Base application. This version uses a Managed Metadata column for categories and contains other enhancements.Microsoft SQL Server Product Samples: Database: AdventureWorks 2008 OLTP Script: Install AdventureWorks2008 OLTP database from script The AdventureWorks database can be created by running the instawdb.sql DDL script contained in the AdventureWorks 2008 OLTP Script.zip file. The instawdb.sql script depends on two path environment variables: SqlSamplesDatabasePath and SqlSamplesSourceDataPath. The SqlSamplesDatabasePath environment variable is set to the default Microsoft ® SQL Server 2008 path. You will need to change the SqlSamplesSourceDataPath environment variable to th...HigLabo: HigLabo_20120613: Bug fix HigLabo.Mail Decode header encoded by CP1252WipeTouch, a jQuery touch plugin: 1.2.0: Changes since 1.1.0: New: wipeMove event, triggered while moving the mouse/finger. New: added "source" to the result object. Bug fix: sometimes vertical wipe events would not trigger correctly. Bug fix: improved tapToClick handler. General code refactoring. Windows Phone 7 is not supported, yet! Its behaviour is completely broken and would require some special tricks to make it work. Maybe in the future...Phalanger - The PHP Language Compiler for the .NET Framework: 3.0.0.3026 (June 2012): Fixes: round( 0.0 ) local TimeZone name TimeZone search compiling multi-script-assemblies PhpString serialization DocDocument::loadHTMLFile() token_get_all() parse_url()BlackJumboDog: Ver5.6.4: 2012.06.13 Ver5.6.4 　(1) Web???????、???POST??????????????????Yahoo! UI Library: YUI Compressor for .Net: Version 2.0.0.0 - Ferret: - Merging both 3.5 and 2.0 codebases to a single .NET 2.0 assembly. - MSBuild Task. - NAnt Task.ExcelFileEditor: .CS File: nothingBizTalk Scheduled Task Adapter: Release 4.0: Works with BizTalk Server 2010. Compiled in .NET Framework 4.0. In this new version are available small improvements compared to the current version (3.0). We can highlight the following improvements or changes: 24 hours support in “start time” property. Previous versions had an issue with setting the start time, as it shown 12 hours watch but no AM/PM. Daily scheduler review. Solved a small bug on Daily Properties: unable to switch between “Every day” and “on these days” Installation e...Weapsy - ASP.NET MVC CMS: 1.0.0 RC: - Upgrade to Entity Framework 4.3.1 - Added AutoMapper custom version (by nopCommerce Team) - Added missed model properties and localization resources of Plugin Definitions - Minor changes - Fixed some bugsWebSocket4Net: WebSocket4Net 0.7: Changes included in this release: updated ClientEngine added proper exception handling code added state support for callback added property AllowUnstrustedCertificate for JsonWebSocket added properties for sending ping automatically improved JsBridge fixed a uri compatibility issueXenta Framework - extensible enterprise n-tier application framework: Xenta Framework 1.8.0 Beta: Catalog and Publication reviews and ratings Store language packs in data base Improve reporting system Improve Import/Export system A lot of WebAdmin app UI improvements Initial implementation of the WebForum app DB indexes Improve and simplify architecture Less abstractions Modernize architecture Improve, simplify and unify API Simplify and improve testing A lot of new unit tests Codebase refactoring and ReSharpering Utilize Castle Windsor Utilize NHibernate ORM ...Microsoft Ajax Minifier: Microsoft Ajax Minifier 4.55: Properly handle IE extension to CSS3 grammar that allows for multiple parameters to functional pseudo-class selectors. add new switch -braces:(new|same) that affects where opening braces are placed in multi-line output. The default, "new" puts them on their own new line; "same" outputs them at the end of the previous line. add new optional values to the -inline switch: -inline:(force|noforce), which can be combined with the existing boolean value via comma-separators; value "force" (which...Microsoft Media Platform: Player Framework: MMP Player Framework 2.7 (Silverlight and WP7): Additional DownloadsSMFv2.7 Full Installer (MSI) - This will install everything you need in order to develop your own SMF player application, including the IIS Smooth Streaming Client. It only includes the assemblies. If you want the source code please follow the link above. Smooth Streaming Sample Player - This is a pre-built player that includes support for IIS Smooth Streaming. You can configure the player to playback your content by simplying editing a configuration file - no need to co...Liberty: v3.2.1.0 Release 10th June 2012: Change Log -Added -Liberty is now digitally signed! If the certificate on Liberty.exe is missing, invalid, or does not state that it was developed by "Xbox Chaos, Open Source Developer," your copy of Liberty may have been altered in some (possibly malicious) way. -Reach Mass biped max health and shield changer -Fixed -H3/ODST Fixed all of the glitches that users kept reporting (also reverted the changes made in 3.2.0.2) -Reach Made some tag names clearer and more consistent between m...Media Companion: Media Companion 3.503b: It has been a while, so it's about time we release another build! Major effort has been for fixing trailer downloads, plus a little bit of work for episode guide tag in TV show NFOs.Json.NET: Json.NET 4.5 Release 7: Fix - Fixed Metro build to pass Windows Application Certification Kit on Windows 8 Release Preview Fix - Fixed Metro build error caused by an anonymous type Fix - Fixed ItemConverter not being used when serializing dictionaries Fix - Fixed an incorrect object being passed to the Error event when serializing dictionaries Fix - Fixed decimal properties not being correctly ignored with DefaultValueHandlingSP Sticky Notes: SPSticky Solution Package: Install steps:Install the sandbox solution to the site collection Activate the solution Add a SPSticky web part (from a 'Custom' group) to a page that resides on the same web as the StickyList list Initial version, supported functionality: Moving a sticky around (position is saved in list) Resizing of the sticky (size is not saved) Changing the text of the sticky (saved in list) Saving occurs when you click away from the sticky being edited Stickys are filtered based on the curre...New ProjectsAdvanced Utility Libs: This project provides many basic and advanced utility libs for developer.ATopSearchEngine: ATopSearchEngine， a class projectAudio Player 3D: A WPF 3D Audio Player.beginABC: day la project test :)BookmarkSave For VB6: An addin, written in VB.net, for VB6 that preserves Bookmarks and Breakpoints between runs of the IDE.Centos 5 & 6 Managements Packs For System Center Operations Manager 2012: Centos 5 & 6 Managements Packs For System Center Operations Manager 2012ChildProcesses - Child Process Management for .NET: ChildProcesses.NET is a child process management library for the .NET framework. It allows to create child processes, and provides bidirectional extendable interprocess communication based on WCF and NamedPipes out of the box Child and parent processes monitor each other and notify about termination or other events. Child processes are an alternative to AppDomains when parent must continue if the child crashes. It is also poossible to mix 32Bit and 64 Bit processes. Cookie Free Analytics: Cookie Free Analytics (CFA) is a free server side Google Analytics tracking solution for Windows based websites running IIS & ASP.NET. 100% javascript & cookie free - with CFA you can track your visitors & file downloads in Google Analytics without cookies or JavaScript. Ideal for mobile websites or those affected by the EU Cookie law.F# (FSharp) based Windows Phone 7.5 software to answer: Where am I?: Location Finder F# (FSharp) based Windows Phone 7.5 software to answer the simple question: - Where am I? Henyo Word: The summary is required.Houma-Thibodaux .NET User Group: The CodePlex home of the Houma-Thibodaux .NET user group.JqGridHelper: some code for using jqgrid 1. javacsript function for customer mutil-search 2. C# function for parse querystring and build sql query command 3. a sql procedure templete for searching NetFluid.IRC: Mibbit clone in NetFluid with the possibilities to use permanent eggdrop in C# nGo: nGo frameworkNinja Client-Server Game: Naruto based online client-server game.NoLinEq: NoLinEq is a mathematical tool for solving nonlinear equations using different methods.Oculus: Oculus is a real-time ETW listening service that is plugin-basedPinoy Henyo: Response.Redirect (https://henyoword.codeplex.com)Razorblade: Razorblade is intended to be a template for WebDesign/WebDevelopment. It is based on HTML5Boilerplate and uses ASP.NET wtih the Razor Syntax (C#). Original HTML5Boilerplate comments are intact with some added comments to explain some of the Razor Syntax.ServiceFramework: The ServiceFramework project is a framework built using Microsoft WCF to address architectural governance issues by tracking the activity of services.Sharp Console: Sharp Console is a Windows Command Line (WCL)alternative written in C#. It targets those who lack access to the WCL or simply wish to use the NET framework instead. It aims to provide the same (and more!) functionality as the WCL. Contribute anything you feel will make it better!SharpKit.on{X}: This project allows you to write on{x} rules using C#shequ01: shequ01 websiteSilena: Porta lectus ac sed scelerisque, pellentesque, cras a et urna enim ultricies, tristique magnis nec proin. Velit tristique, aliquet quis ut mid lorem eros? Dolor magna. Aliquet. Et? Sociis pellentesque, tincidunt aenean cursus, pulvinar! Placerat etiam! Mid eu? Vut a. Placerat duis, risus adipiscing lacus, sagittis magna vut etiam, sed. Et ridiculus! Et sit, enim scelerisque velit tristique vel? Adipiscing vel adipiscing eu. Enim proin egestas lorem, aenean lectus enim vel nisi, augue duis pla...Silverlight 5 Chat: Full-duplex Publish/Subscribe -pattern on TCP/IP: F-Sharp (F#) WCF "PollingDuplex" WebService with SL5 FSharp clientSimple CQRS implemented with F#: Simple CQRS on F# (F-Sharp) 3.0 SOD: sustainable office designerSolvis Control II Viewer: SolvisSC2Viewer kann die Logdaten der Solvis Heizung Steuerung SolvisControl 2 auslesen und grafisch darstellen. testdd061412012tfs01: bvtestddgit061420123: eswrtestddgit061420124: fgtestddhg061420121: sdtestgit061420121: xctesthg06142012hg3: dfsTurismo Digital: Turismo DigitlUmbraco 5 File Picker: ????Umbraco 5 ???????。????????????????????。WeatherFrame: Windows Phone weather app.

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• ResponseStatusLine protocol violation

  - by Tom Hines

  I parse/scrape a few web page every now and then and recently ran across an error that stated: "The server committed a protocol violation. Section=ResponseStatusLine".   After a few web searches, I found a couple of suggestions – one of which said the problem could be fixed by changing the HttpWebRequest ProtocolVersion to 1.0 with the command: 1: HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(strURI); 2: req.ProtocolVersion = HttpVersion.Version10;   …but that did not work in my particular case.   What DID work was the next suggestion I found that suggested the use of the setting: “useUnsafeHeaderParsing” either in the app.config file or programmatically. If added to the app.config, it would be: 1: <!-- after the applicationSettings --> 2: <system.net> 3: <settings> 4: <httpWebRequest useUnsafeHeaderParsing ="true"/> 5: </settings> 6: </system.net>   If done programmatically, it would look like this: C++: 1: // UUHP_CPP.h 2: #pragma once 3: using namespace System; 4: using namespace System::Reflection; 5:   6: namespace UUHP_CPP 7: { 8: public ref class CUUHP_CPP 9: { 10: public: 11: static bool UseUnsafeHeaderParsing(String^% strError) 12: { 13: Assembly^ assembly = Assembly::GetAssembly(System::Net::Configuration::SettingsSection::typeid); //__typeof 14: if (nullptr==assembly) 15: { 16: strError = "Could not access Assembly"; 17: return false; 18: } 19:   20: Type^ type = assembly->GetType("System.Net.Configuration.SettingsSectionInternal"); 21: if (nullptr==type) 22: { 23: strError = "Could not access internal settings"; 24: return false; 25: } 26:   27: Object^ obj = type->InvokeMember("Section", 28: BindingFlags::Static | BindingFlags::GetProperty | BindingFlags::NonPublic, 29: nullptr, nullptr, gcnew array<Object^,1>(0)); 30:   31: if(nullptr == obj) 32: { 33: strError = "Could not invoke Section member"; 34: return false; 35: } 36:   37: FieldInfo^ fi = type->GetField("useUnsafeHeaderParsing", BindingFlags::NonPublic | BindingFlags::Instance); 38: if(nullptr == fi) 39: { 40: strError = "Could not access useUnsafeHeaderParsing field"; 41: return false; 42: } 43:   44: if (!(bool)fi->GetValue(obj)) 45: { 46: fi->SetValue(obj, true); 47: } 48:   49: return true; 50: } 51: }; 52: } C# (CSharp): 1: using System; 2: using System.Reflection; 3:   4: namespace UUHP_CS 5: { 6: public class CUUHP_CS 7: { 8: public static bool UseUnsafeHeaderParsing(ref string strError) 9: { 10: Assembly assembly = Assembly.GetAssembly(typeof(System.Net.Configuration.SettingsSection)); 11: if (null == assembly) 12: { 13: strError = "Could not access Assembly"; 14: return false; 15: } 16:   17: Type type = assembly.GetType("System.Net.Configuration.SettingsSectionInternal"); 18: if (null == type) 19: { 20: strError = "Could not access internal settings"; 21: return false; 22: } 23:   24: object obj = type.InvokeMember("Section", 25: BindingFlags.Static | BindingFlags.GetProperty | BindingFlags.NonPublic, 26: null, null, new object[] { }); 27:   28: if (null == obj) 29: { 30: strError = "Could not invoke Section member"; 31: return false; 32: } 33:   34: // If it's not already set, set it. 35: FieldInfo fi = type.GetField("useUnsafeHeaderParsing", BindingFlags.NonPublic | BindingFlags.Instance); 36: if (null == fi) 37: { 38: strError = "Could not access useUnsafeHeaderParsing field"; 39: return false; 40: } 41:   42: if (!Convert.ToBoolean(fi.GetValue(obj))) 43: { 44: fi.SetValue(obj, true); 45: } 46:   47: return true; 48: } 49: } 50: }   F# (FSharp): 1: namespace UUHP_FS 2: open System 3: open System.Reflection 4: module CUUHP_FS = 5: let UseUnsafeHeaderParsing(strError : byref<string>) : bool = 6: // 7: let assembly : Assembly = Assembly.GetAssembly(typeof<System.Net.Configuration.SettingsSection>) 8: if (null = assembly) then 9: strError <- "Could not access Assembly" 10: false 11: else 12: 13: let myType : Type = assembly.GetType("System.Net.Configuration.SettingsSectionInternal") 14: if (null = myType) then 15: strError <- "Could not access internal settings" 16: false 17: else 18: 19: let obj : Object = myType.InvokeMember("Section", BindingFlags.Static ||| BindingFlags.GetProperty ||| BindingFlags.NonPublic, null, null, Array.zeroCreate 0) 20: if (null = obj) then 21: strError <- "Could not invoke Section member" 22: false 23: else 24: 25: // If it's not already set, set it. 26: let fi : FieldInfo = myType.GetField("useUnsafeHeaderParsing", BindingFlags.NonPublic ||| BindingFlags.Instance) 27: if(null = fi) then 28: strError <- "Could not access useUnsafeHeaderParsing field" 29: false 30: else 31: 32: if (not(Convert.ToBoolean(fi.GetValue(obj)))) then 33: fi.SetValue(obj, true) 34: 35: // Now return true 36: true VB (Visual Basic): 1: Option Explicit On 2: Option Strict On 3: Imports System 4: Imports System.Reflection 5:   6: Public Class CUUHP_VB 7: Public Shared Function UseUnsafeHeaderParsing(ByRef strError As String) As Boolean 8:   9: Dim assembly As [Assembly] 10: assembly = [assembly].GetAssembly(GetType(System.Net.Configuration.SettingsSection)) 11:   12: If (assembly Is Nothing) Then 13: strError = "Could not access Assembly" 14: Return False 15: End If 16:   17: Dim type As Type 18: type = [assembly].GetType("System.Net.Configuration.SettingsSectionInternal") 19: If (type Is Nothing) Then 20: strError = "Could not access internal settings" 21: Return False 22: End If 23:   24: Dim obj As Object 25: obj = [type].InvokeMember("Section", _ 26: BindingFlags.Static Or BindingFlags.GetProperty Or BindingFlags.NonPublic, _ 27: Nothing, Nothing, New [Object]() {}) 28:   29: If (obj Is Nothing) Then 30: strError = "Could not invoke Section member" 31: Return False 32: End If 33:   34: ' If it's not already set, set it. 35: Dim fi As FieldInfo 36: fi = [type].GetField("useUnsafeHeaderParsing", BindingFlags.NonPublic Or BindingFlags.Instance) 37: If (fi Is Nothing) Then 38: strError = "Could not access useUnsafeHeaderParsing field" 39: Return False 40: End If 41:   42: If (Not Convert.ToBoolean(fi.GetValue(obj))) Then 43: fi.SetValue(obj, True) 44: End If 45:   46: Return True 47: End Function 48: End Class   Technorati Tags: C++,CPP,VB,Visual Basic,F#,FSharp,C#,CSharp,ResponseStatusLine,protocol violation

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• F# DataContractJsonSerializer StackOverflowException

  - by akaphenom

  dataElementsList : TypesAndData.DataElement list is a list of 50,000 records (actually many more but lest start small). I am trying to serialize to JSON file: let ser = Json.DataContractJsonSerializer(typeof<TypesAndData.DataElement list>) use ofs = File.OpenWrite(fileName) let result = ser.WriteObject(ofs, dataElementsList) and am getting the infamous StackOverflowException. to be precise: An unhandled exception of type 'System.StackOverflowException' occurred in FSharp.Core.dll any advice?

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• F# 1.9.9.9 and lapack

  - by ahala

  can anyone help me with example on using lapack with latest f#? Or it is not recommended for now? I searched and only find http://fdatamining.blogspot.com/ but was not able to get FSharp.PowerPack.Math.Providers.dll compiled. thanks,

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• F# Tacit Programming. Please help)

  - by Bubba88

  It's not a practically important issue, but could you please provide me with an example of tacit programming in F# where my `pointless' functions can have multiple arguments (not in form of list or tuple); And secondly, where those functions can manipulate a complex data structure. I'm trying to manage it in FSharp interactive, but have no success yet. Huh.. I've managed to construct something: (fun _ - (fun _ - (+))) 333 222 111 555 Is that right way?

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• What is the standard way to optimise mutual recursion in F#/Scala?

  - by Bubba88

  These languages do not support mutually recursive functions optimization 'natively', so I guess it must be trampoline or.. heh.. rewriting as a loop) Do I miss something? UPDATE: It seems that I did lie about FSharp, but I just didn't see an example of mutual tail-calls while googling

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