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Xamarin Forms UWP. Nuget Package Downgrade whilst building

Matthew Robb 21 Reputation points
2021-01-27T10:20:07.273+00:00

I am creating A UWP version of a Xamarin App from a previously successfully deployed XF Android version of the App (Simple? It seems not!) and I seem to be stuck in an interminable loop of updates and errors which I cannot resolve.

Before the detail please be aware that I have cleared the Nuget cache numerous times! Also please note I have realised this issue happens even with a brand new project without a single line of new code in it!

The issue I have is that when I start even a new blank App (for Android, IOS and UWP). I get the UWP warning detected package downgrade from 4.8.0.1534 to 4.8.0.1451. So I employ XF 4.8.0.1451. from the outset. Sadly that then gives me the warning Xamarin Forms recommends TargetPlatformMin >= 10.0.14393.0. (current target is -1). I tried entering these values in the xml file where they said the error was but that didn't seem to change anything. Where do you change the Windows targets?

So I search for a solution and find one: 'update XF to a later version'. I do that and, yes you have guessed, I have my original issue that when I build for UWP I get advised that UWP has had a package downgrade to 4.8.0.1451.

Out of interest when I create a new Xamarin Forms Project (VS 2019) it does not employ XF 5.0.1931. If I install it You won't be surprised to know that the build downgrades the package to XF 4.8.0.1451 and if I employ that I get the warning Xamarin Forms recommends TargetPlatformMin >= 10.0.14393.0. (current target is -1). again.

I really need advise here please as a client has asked for a ump version of my currently successful Xamarin Forms Android App.

Thanks for any suggestions.

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  1. JarvanZhang 23,951 Reputation points
    2021-01-27T11:37:58.273+00:00

    Hello,​

    Welcome to our Microsoft Q&A platform!

    I get the UWP warning detected package downgrade from 4.8.0.1534 to 4.8.0.1451.

    @Matthew Robb Did you face the error like below? This is a NuGet error. the shared project and the platform project may reference the Xamarin.Forms NuGet package of a different version.
    Warning NU1605 Detected package downgrade: Xamarin.Forms from 5.0.0.1931 to 4.8.0.1451. Reference the package directly from the project to select a different version.

    Please make sure the Xamarin.Forms pakcage of the UWP platform has also been updated to the lastest version.

    Best Regards,

    Jarvan Zhang

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