链接时IAuthenticationHandler出现错误XA2006

Question

链接到SDK程序集并构建项目时遇到此异常：

Java.Interop.Tools.Diagnostics.XamarinAndroidException: error XA2006: Could not resolve reference to 'Microsoft.AspNetCore.Http.Features.Authentication.IAuthenticationHandler' (defined in assembly 'Microsoft.AspNetCore.Http, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60') with scope 'Microsoft.AspNetCore.Http.Features, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. When the scope is different from the defining assembly, it usually means that the type is forwarded.

我添加了Signalr.Client第3.1.2版，用于在Xamarin中使用Signalr。

这是PCL csproj:

<PackageReference Include="Fody" Version="6.1.1">
<PrivateAssets>all</PrivateAssets>
<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
</PackageReference>
<PackageReference Include="Forms.Controls.FlexButton" Version="0.11.0" />
<PackageReference Include="Microsoft.AppCenter" Version="3.0.0" />
<PackageReference Include="Microsoft.AppCenter.Analytics" Version="3.0.0" />
<PackageReference Include="Microsoft.AppCenter.Crashes" Version="3.0.0" />
<PackageReference Include="Microsoft.AppCenter.Push" Version="3.0.0" />
<PackageReference Include="Microsoft.AspNetCore.SignalR.Client" Version="3.1.2" />
<PackageReference Include="Microsoft.AspNetCore.SignalR.Protocols.NewtonsoftJson" Version="3.1.2" />
<PackageReference Include="Plugin.XSnack" Version="1.0.17" />
<PackageReference Include="PropertyChanged.Fody" Version="3.2.6" />
<PackageReference Include="Rg.Plugins.Popup" Version="1.2.0.223" />
<PackageReference Include="sqlite-net-pcl" Version="1.6.292" />
<PackageReference Include="Xam.Plugin.Media" Version="4.0.1.5" />
<PackageReference Include="Xamanimation" Version="1.3.0" />
<PackageReference Include="Xamarin.FFImageLoading" Version="2.4.11.982" />
<PackageReference Include="Xamarin.FFImageLoading.Forms" Version="2.4.11.982" />
<PackageReference Include="Xamarin.FFImageLoading.Transformations" Version="2.4.11.982" />
<PackageReference Include="Xamarin.Forms" Version="4.5.0.356" />
<PackageReference Include="Xamarin.Essentials" Version="1.5.1" />
<PackageReference Include="Xamarin.Forms.RangeSlider" Version="1.0.2" />
<PackageReference Include="Xamarin.Forms.Visual.Material" Version="4.5.0.356" />
<PackageReference Include="XamForms.HtmlLabel" Version="1.0.0" />

这是Xamarin Android csproj:

<PackageReference Include="Forms.Controls.FlexButton">
<Version>0.11.0</Version>
</PackageReference>
<PackageReference Include="Microsoft.AppCenter">
<Version>3.0.0</Version>
</PackageReference>
<PackageReference Include="Microsoft.AppCenter.Analytics">
<Version>3.0.0</Version>
</PackageReference>
<PackageReference Include="Microsoft.AppCenter.Crashes">
<Version>3.0.0</Version>
</PackageReference>
<PackageReference Include="Microsoft.AppCenter.Push">
<Version>3.0.0</Version>
</PackageReference>
<PackageReference Include="Rg.Plugins.Popup">
<Version>1.2.0.223</Version>
</PackageReference>
<PackageReference Include="Xam.Plugin.Media">
<Version>4.0.1.5</Version>
</PackageReference>
<PackageReference Include="Xamanimation">
<Version>1.3.0</Version>
</PackageReference>
<PackageReference Include="Xamarin.FFImageLoading">
<Version>2.4.11.982</Version>
</PackageReference>
<PackageReference Include="Xamarin.FFImageLoading.Forms">
<Version>2.4.11.982</Version>
</PackageReference>
<PackageReference Include="Xamarin.FFImageLoading.Transformations">
<Version>2.4.11.982</Version>
</PackageReference>
<PackageReference Include="Xamarin.Forms" Version="4.5.0.356" />
<PackageReference Include="Xamarin.Android.Support.Core.Utils" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Essentials" Version="1.5.1" />
<PackageReference Include="Xamarin.Forms.RangeSlider">
<Version>1.0.2</Version>
</PackageReference>
<PackageReference Include="Xamarin.Forms.Visual.Material">
<Version>4.5.0.356</Version>
</PackageReference>
<PackageReference Include="XamForms.HtmlLabel">
<Version>1.0.0</Version>
</PackageReference>

project.assets.json文件对旧版本的Microsoft.AspNetCore.Http.Features 有两个依赖项

"Microsoft.AspNetCore.Http.Abstractions/2.2.0": {
"type": "package",
"dependencies": {
"Microsoft.AspNetCore.Http.Features": "2.2.0",
"System.Text.Encodings.Web": "4.5.0"
},
"compile": {
"lib/netstandard2.0/Microsoft.AspNetCore.Http.Abstractions.dll": {}
},
"runtime": {
"lib/netstandard2.0/Microsoft.AspNetCore.Http.Abstractions.dll": {}
}
},

和

"Microsoft.AspNetCore.Hosting.Server.Abstractions/2.2.0": {
"type": "package",
"dependencies": {
"Microsoft.AspNetCore.Http.Features": "2.2.0",
"Microsoft.Extensions.Configuration.Abstractions": "2.2.0"
},
"compile": {
"lib/netstandard2.0/Microsoft.AspNetCore.Hosting.Server.Abstractions.dll": {}
},
"runtime": {
"lib/netstandard2.0/Microsoft.AspNetCore.Hosting.Server.Abstractions.dll": {}
}
},

所有其他参考3.1.2版本。

请帮助我决定是否应该使用任何其他版本的包，或者可能对其中任何一个使用"跳过链接程序集"。

感谢

Answer 1

错误消息

错误XA2006:无法解析对的引用'Microsoft.AspNetCore.Http.Features.Authentication.IAuthenticationHandler'(在程序集"Microsoft.AspNetCore.Http"中定义，版本=2.2.0.0，区域性=中性，PublicKeyToken=adb9793829ddae60'('Microsoft.AspNetCore.Http.Features，版本=2.2.0.0，文化=中性，PublicKeyToken=adb9793829ddae60'。

和project.assets.json:中的条目

"Microsoft.AspNetCore.Http.Abstractions/2.2.0": {
"type": "package",
"dependencies": {
"Microsoft.AspNetCore.Http.Features": "2.2.0",
"System.Text.Encodings.Web": "4.5.0"
},
"compile": {
"lib/netstandard2.0/Microsoft.AspNetCore.Http.Abstractions.dll": {}
},
"runtime": {
"lib/netstandard2.0/Microsoft.AspNetCore.Http.Abstractions.dll": {}
}
},

显示您仍然使用旧的asp.net核心2.2参考。

共享项目显示了它是否被引用：

<PackageReference Include="Microsoft.AspNetCore.Mvc" Version="2.2.0" />

并将其与3.1.2参考混合

<PackageReference Include="Microsoft.AspNetCore.Http.Features" Version="3.1.2" />

导致您的问题。

删除此处的"Microsoft.AspNetCore.Mvc"条目以修复它。