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jspuij / Cortex.Net

State management like MobX for .NET and Blazor
https://jspuij.github.io/Cortex.Net.Docs
MIT License
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Build Error: Could not load file or assembly System.ValueTuple #42

Open AbdullahUlber opened 4 years ago

AbdullahUlber commented 4 years ago

When building the Cortex.Net.BlazorTodo sample project from Jul 15, 2020 on VS 2019 (16.7.2) I get the build error below. The same build error appears for a new Blazor WebAssembly project when adding the Cortex.Net weaver to FodyWeavers.xml.

The error message suggests that Fody tries to find System.ValueTuple 4.0.3.0 or 4.0.0.0 while .NET Standard 2.1 includes System.ValueTuple 4.0.2.0.

Severity Code Description Project File Line Suppression State Error Fody: An unhandled exception occurred: Exception: Failed to execute weaver C:\Users\abdullah.ulber\source\repos\Cortex.Net-master\src\Cortex.Net.Fody\bin\Debug\netstandard2.0\Cortex.Net.Fody.dll Type: System.Exception StackTrace: at InnerWeaver.ExecuteWeavers() in C:\projects\fody\FodyIsolated\InnerWeaver.cs:line 202 at InnerWeaver.Execute() in C:\projects\fody\FodyIsolated\InnerWeaver.cs:line 109 Source: FodyIsolated TargetSite: Void ExecuteWeavers() Could not load file or assembly 'System.ValueTuple, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. The system cannot find the file specified. Type: System.IO.FileNotFoundException StackTrace: at Cortex.Net.Fody.ReactiveObjectInterfaceWeaver..ctor(ModuleWeaver parentWeaver, WeavingContext weavingContext) at Cortex.Net.Fody.ModuleWeaver.Execute() at InnerWeaver.ExecuteWeavers() in C:\projects\fody\FodyIsolated\InnerWeaver.cs:line 174 Source: Cortex.Net.Fody TargetSite: Void .ctor(Cortex.Net.Fody.ModuleWeaver, Cortex.Net.Fody.WeavingContext) Could not load file or assembly 'System.ValueTuple, Version=4.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. The system cannot find the file specified. Type: System.IO.FileNotFoundException Cortex.Net.BlazorTodo 1

jdvoges commented 3 years ago

The error message has been been updated in the Fody package:

Failed to execute weaver {weaver.Config.AssemblyPath} due to a failure to load ValueTuple.
This is a known issue with in dotnet (https://github.com/dotnet/runtime/issues/27533).
The recommended work around is to avoid using ValueTuple inside a weaver.

I guess that this means that any code using this package should not try to use tuples that would be written to FodyWeavers.xml. I have played around with removing the tuple returned by TrackDerivedFunction and ComputeValue (i.e. removing the exceptions returned with the values) but it still is causing this error in the sample projects.

jspuij commented 3 years ago

I've created a new version 0.4.0 which should appear on nuget shortly.