[Bug] System.TypeLoadException thrown when Unit Testing AsyncCommand and AsyncValueCommand

[TheCodeTraveler]

Description

When unit testing AsyncCommand and AsyncValueCommand using .NET Core on a non-windows operating system, System.TypeLoadException is thrown:

System.TypeLoadException : Could not load type 'System.Windows.Threading.Dispatcher' from assembly 'WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.

TypeLoadException is thrown for a combination of the following reasons:

• BaseCommand.wpf.cs uses System.Windows.Threading.Dispatcher which is only available on Windows
• .NET Core dependencies for the NuGet package assume the user is running WPF on Windows (see image)

Steps to Reproduce

1. On macOS, Download/Clone reproduction sample: https://github.com/brminnick/AsyncCommandSample/releases/tag/System.TypeLoadException
2. On macOS, in Visual Studio for Mac, open AsyncCommandSample.sln
3. In Visual Studio for Mac, run all Unit Tests
4. In Visual Studio for Mac, confirm the test failed

Expected Behavior

Unit Test should pass

(The Unit Test does pass when the test is on a Windows machine)

Actual Behavior

System.TypeLoadException is thrown:

System.TypeLoadException : Could not load type 'System.Windows.Threading.Dispatcher' from assembly 'WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.

Basic Information

• Version with issue: v1.0.3
• Last known good version: None

Workaround

Run unit tests on Windows

Reproduction Link

https://github.com/brminnick/AsyncCommandSample/releases/tag/System.TypeLoadException