Fsharp: I cannot update FSharp.Core to version 4.7.0

[kerry-perret]

Succinct description of the issue

I am using .NET Core 2.2 and I cannot update FSharp.Core to the version 4.7.0 in a simple console app.

Steps required to reproduce the problem

1. mkdir ConsoleApp
2. cd ConsoleApp
3. dotnet new console --language F#
4. dotnet restore
5. dotnet add package "FSharp.Core" -v 4.7.0

Expected behavior

The dotnet add package "FSharp.Core" -v 4.7.0 command works and the FSharp.Core package is supposed to be updated to the version 4.7.0

Actual behavior

The dotnet add package "FSharp.Core" -v 4.7.0 command fails:

dotnet add package "FSharp.Core" -v 4.7.0
  Writing C:\Users\eperret\AppData\Local\Temp\tmp6078.tmp
info : Adding PackageReference for package 'FSharp.Core' into project 'C:\Users\eperret\Desktop\ConsoleApp\ConsoleApp.fsproj'.
info : Restoring packages for C:\Users\eperret\Desktop\ConsoleApp\ConsoleApp.fsproj...
info : Package 'FSharp.Core' is compatible with all the specified frameworks in project 'C:\Users\eperret\Desktop\ConsoleApp\ConsoleApp.fsproj'.
error: Error while performing Update for package 'FSharp.Core'. Cannot edit items in imported files -
error:   Item 'PackageReference' for 'FSharp.Core' in Imported file 'C:\Program Files\dotnet\sdk\2.2.401\FSharp\Microsoft.FSharp.NetSdk.props'.

The version remains 4.6.2:

λ dotnet list package
Project 'ConsoleApp' has the following package references
   [netcoreapp2.2]:
   Top-level Package               Requested   Resolved
   > FSharp.Core                   4.6.2       4.6.2
   > Microsoft.NETCore.App   (A)   [2.2.0, )   2.2.0

(A) : Auto-referenced package.

Known workarounds

None

Related information

Provide any related information (optional):

.NET Runtime List:

λ dotnet --list-runtimes
Microsoft.AspNetCore.All 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.2.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.2.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 1.0.15 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 1.1.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.2.3 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.0.0-preview3-27503-5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]

.NET SDK List:

λ dotnet --list-sdks
1.1.13 [C:\Program Files\dotnet\sdk]
2.1.202 [C:\Program Files\dotnet\sdk]
2.1.505 [C:\Program Files\dotnet\sdk]
2.1.602 [C:\Program Files\dotnet\sdk]
2.1.801 [C:\Program Files\dotnet\sdk]
2.2.202 [C:\Program Files\dotnet\sdk]
2.2.401 [C:\Program Files\dotnet\sdk]

OS:

A related issue of mine also occurs on Linux, its description is available here: https://stackoverflow.com/questions/57701519/f-anonymous-records-are-not-supporter-with-net-core-2-2-108

[cartermp]

<PackageReference Update="FSharp.Core" Version="4.7.0"/> is what you need to add, otherwise the build will be confused about which FSharp.Core to reference. This is by design w.r.t how the SDK works.

[kerry-perret]

@cartermp thanks!

Before you answered I also found out that adding <FSharpCoreImplicitPackageVersion>4.7.0</FSharpCoreImplicitPackageVersion> to <PropertyGroup> in the *.fsproj was also doing the job, even though it does look like not that official.

I will stick to your answer definitely looks cleaner.

[victorcassel]

Where in the .csproj file should the line <PackageReference Update="FSharp.Core" Version="4.7.0"/> be added?

I also get a runtime exception when calling into a .net core 2.2 Fsharp library compiled with multitarget <TargetFrameworks>net45;netcoreapp2.2</TargetFrameworks> from a .net framework 4.7.2 web app.

Exception is: System.IO.FileLoadException could not load fsharp.core 4.4.0.0

[cartermp]

<PackageReference Update="FSharp.Core" Version="4.7.0"/> is an Item, so inside of an ItemGroup.

Note that this:

I also get a runtime exception when calling into a .net core 2.2 Fsharp library compiled with multitarget net45;netcoreapp2.2 from a .net framework 4.7.2 web app.

Is not supported. .NET Framework apps cannot reference .NET Core apps.

[forki]

Probably also need to set DisableImplicitFsharpCore to true

Phillip Carter [e-mail] schrieb am Sa., 1. Feb. 2020,
15:36:

is an Item, so
inside of an ItemGroup.

Note that this:

I also get a runtime exception when calling into a .net core 2.2 Fsharp
library compiled with multitarget net45;netcoreapp2.2 from a .net framework
4.7.2 web app.

Is not supported. .NET Framework apps cannot reference .NET Core apps.

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[cartermp]

Nope, that one's only needed if you're not using Packageference Update.