Predefined type ‘System.ValueTuple´2´ is not defined or imported

by

For .NET 4.6.2 or lower, .NET Core 1.x, and .NET Standard 1.x you need to install the NuGet package System.ValueTuple:

Install-Package "System.ValueTuple"

Or using a package reference in VS 2017:

<PackageReference Include="System.ValueTuple" Version="4.4.0" />

.NET Framework 4.7, .NET Core 2.0, and .NET Standard 2.0 include these types.

More Related Contents:

  1. Enabling c# 7 in a asp.net application
  2. Visual Studio Publish Project Into One Simple Installer
  3. WiX installer msi not installing the Winform app created with Visual Studio 2017
  4. How to use C# 7 with Visual Studio 2015?
  5. What’s the difference between System.ValueTuple and System.Tuple?
  6. What is the difference between “x is null” and “x == null”?
  7. How can I fix the Microsoft Visual Studio error: “package did not load correctly”?
  8. ASP.NET Core: Exclude or include files on publish
  9. How do you multi-target a .NET Core class library with csproj?
  10. No templates in Visual Studio 2017
  11. C#7: Underscore ( _ ) & Star ( * ) in Out variable
  12. Auto Versioning in Visual Studio 2017 (.NET Core)
  13. Access Visual Studio 2017’s private registry hive
  14. How can I use C# 8 with Visual Studio 2017?
  15. Error message “CS5001 Program does not contain a static ‘Main’ method suitable for an entry point”
  16. How do I set `OutputPath` in a Visual Studio 2017 project (new .csproj file format) without the target framework cluttering the resolved path?
  17. Azure Functions binding redirect
  18. Could not load file or assembly ‘System.ValueTuple’
  19. How to get docker toolbox to work with .net core 2.0 project
  20. Using a C# 7 tuple in an ASP.NET Core Web API Controller
  21. Odd return syntax statement
  22. Could not load file or assembly ‘Microsoft.Build.Framework'(VS 2017)
  23. ef core doesn’t use ASPNETCORE_ENVIRONMENT during update-database
  24. C# 7 .NET / CLR / Visual Studio version requirements
  25. Reportviewer tool missing in visual studio 2017 RC
  26. In C#7, how can I “roll my own” Task-like type to use with async?
  27. Error while executing test, if using CreateResponse extention method to return Azure Function HttpResonseMessage
  28. Using .net standard 1.5 lib in .net 4.6.2 misses System.Runtime 4.1.0.0
  29. Xamarin (Android) Unit Tests in Visual Studio 2017
  30. Does C# 7 have array/enumerable destructuring?

Leave a Comment