Remove dependency on System.ValueTuple NuGet package when targeting .Net 4.7

After switching project from .NET 4.6.1 to .NET 4.7.2 the following errors appear:

Severity	Code	Description	Project	File	Line	Suppression State
Error	CS8356	Predefined type 'System.ValueTuple`2' is declared in multiple referenced assemblies: 'System.ValueTuple, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' and 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' ...

The possible reason is that System.ValueTuple is incompatible with .Net Framework 4.7 (because it’s already built in to 4.7).

[vlardn]

Actually there is a workaround for now: use a .NET 4.7 build of System.ValueTuple that seems just contains references to value tuple types from mscorlib. There are 2 ways how to do it:

1. . Change to “net47” in HintPath like this:

<Reference Include="System.ValueTuple, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
  <HintPath>..\packages\System.ValueTuple.4.5.0\lib\net47\System.ValueTuple.dll</HintPath>
</Reference>

1. Or use “Update-Package -Reinstall” to update all such packages. I think this is preferable method after switching to another .NET framework version but it usually produces much more changes.

[yodasad]

I’m going to remove it completely 👍

Anyway that’s the best solution, there is no need in the library “System.ValueTuple” at all if one is targeting .NET47 or higher.