Xamarin.Forms 安装错误消息 runaround

Question

I created a new Xamarin.Forms project and I am trying to upgrade the Xamarin.Forms Nuget package from 3.6 to v4.3. When I try to install a newer version I get a runaround of error messages that goes in circles. Here's how it goes:

• Right click on solution >Manage Nuget Packages
• Installed Tab >Xamarin.Forms. Shows v3.6 installed in all projects (main/shared project, Android, UWP)
• Select v4.3 and install upgrade to all projects
• Error: Error NU1107 Version conflict detected for Xamarin.Android.Support.Compat. Install/reference Xamarin.Android.Support.Compat 28.0.0.3 directly to project HPlusSports.Android to resolve this issue.
• I search for Xamarin.Android.Support.Compat, select v28.0.0.3 and install it directly into my Android project.
• Error: Error NU1107 Version conflict detected for Xamarin.Android.Support.Annotations. Install/reference Xamarin.Android.Support.Annotations 28.0.0.3 directly to project HPlusSports.Android to resolve this issue.
• I search for Xamarin.Android.Support.Annotations, select v28.0.0.3 and install it directly into my Android project.
• Error: Error NU1107 Version conflict detected for Xamarin.Android.Support.Annotations. Install/reference Xamarin.Android.Support.Annotations 28.0.0.3 directly to project HPlusSports.Android to resolve this issue.

So I follow the instructions in the error messages but the error messages just go in circles. No matter what I try to install there is no resolve.

Answer 1

If only updating Xamarin Forms Nuget Package will occur other Nuget Package conflict with it.

Have a try with follow steps:

• Right click project solution
• Click Manage Nuget Package for Solution
• Go to Updates view
• Select All Packages
• Last click Update button

Such as follow screenshot:

Answer 2

To this problem, open your android project.csproj file by notepad.

Add the package into PackageReference directly. Save it and open the solution again.

Example:

<PackageReference Include="Xamarin.Forms" Version="4.4.0.991864" />
<PackageReference Include="Xamarin.Android.Support.VersionedParcelable">
  <Version>28.0.0.3</Version>
</PackageReference>
<PackageReference Include="Xamarin.Android.Support.Interpolator">
  <Version>28.0.0.3</Version>
</PackageReference>
<PackageReference Include="Xamarin.Android.Support.v7.RecyclerView">
  <Version>28.0.0.3</Version>
</PackageReference>
<PackageReference Include="Xamarin.Android.Support.Fragment">
  <Version>28.0.0.3</Version>
</PackageReference>
<PackageReference Include="Xamarin.Android.Support.Core.UI">
  <Version>28.0.0.3</Version>
</PackageReference>
<PackageReference Include="Xamarin.Android.Support.Core.Utils">
  <Version>28.0.0.3</Version>
</PackageReference>
<PackageReference Include="Xamarin.Android.Support.Annotations">
  <Version>28.0.0.3</Version>
</PackageReference>
<PackageReference Include="Xamarin.Android.Support.CursorAdapter">
  <Version>28.0.0.3</Version>
</PackageReference>
<PackageReference Include="Xamarin.Android.Support.Collections">
  <Version>28.0.0.3</Version>
</PackageReference>
<PackageReference Include="Xamarin.Android.Support.Compat">
  <Version>28.0.0.3</Version>
</PackageReference>
<PackageReference Include="Xamarin.Android.Support.Design">
  <Version>28.0.0.3</Version>
</PackageReference>

Answer 3

Try this procedure. Solution

1. Update-package
2. Update-Package -reinstall
3. Restart visual studio.