.NET Core detection seems to need support .NET 5 or more

[emaame]

Summary of your issue

OpenCvSharp.OpenCvSharpException: 'Failed to find dll "OpenCvSharpExtern", for processor architecture AMD64.' is thrown when create Mat at first time on .NET 5.
But it can ignore and it seems everything works fine.
I doubt WindowsLibraryLoader.cs#L110 misses to detect .NET 5 or more.

Environment

• Visual Studio 2019 / .NET 5.0.8
• OpenCvSharp 4.5.3.20210725

What did you intend to be?

I guess, .NET Core detection needs to support .NET 5 or more (WindowsLibraryLoader.cs#L110).

            return RuntimeInformation.FrameworkDescription.StartsWith(".NET Core", StringComparison.Ordinal);

RuntimeInformation.FrameworkDescription returns

• .NET 5 : ".NET 5.0.8"
• .NET 6 (VS2022 preview 2) : ".NET 6.0.0-preview.6.21352.12"

I cannot show right answer is but it may check with Regex like @"^.NET (\d|Core)" or reject "NET Framework"?

[shimat]

Thank you 👍

Here seems to be a simple solution: https://github.com/dotnet/runtime/blob/57bfe474518ab5b7cfe6bf7424a79ce3af9d6657/src/libraries/Common/tests/TestUtilities/System/PlatformDetection.cs#L24