如何解决 ASP.NET.Core 2 包恢复相关的警告和错误

Question

每当我启动 .NET CORE 2 网络应用程序项目 With 身份验证（即个人身份验证）时，我都会收到以下警告：

Package 'Microsoft.Composition 1.0.27' was restored using '.NETPortable,Version=v0.0,Profile=Profile259, .NETFramework,Version=v4.6.1' instead of the project target framework '.NETCoreApp,Version=v2.0'. This package may not be fully compatible with your project.

问题不止于此，我正在尝试安装 Microsoft.AspNetCore.Authentication.Cookies，但出现以下错误：

Package restore failed. Rolling back package changes for project

我尝试了以下方法，都失败了！

正在删除Nuget.Config
我加了<PropertyGroup> <PackageTargetFallback>$(PackageTargetFallback);dotnet</PackageTargetFallback> </PropertyGroup>
通过dotnet restore恢复包
清除 Nuget 缓存（从工具>NuGet>包管理器设置）

我该如何解决这个冲突？

这是我的项目文件

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>netcoreapp2.0</TargetFramework>
    <MvcRazorCompileOnPublish>true</MvcRazorCompileOnPublish>
    <AssetTargetFallback>$(AssetTargetFallback);portable-net45+win8+wp8+wpa81;</AssetTargetFallback>
    <UserSecretsId></UserSecretsId>
  </PropertyGroup>
  <PropertyGroup>
    <PackageTargetFallback>$(PackageTargetFallback);dotnet</PackageTargetFallback>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.All" Version="2.0.0-preview2-final" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="2.0.0-preview2-final" PrivateAssets="All" />
    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="2.0.0-preview2-final" PrivateAssets="All" />
  </ItemGroup>

  <ItemGroup>
    <DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="2.0.0-preview2-final" />
    <DotNetCliToolReference Include="Microsoft.Extensions.SecretManager.Tools" Version="2.0.0-preview2-final" />
    <DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="2.0.0-preview2-final" />
  </ItemGroup>

</Project>

还有我屏幕上的快照

Answer 1

已通过添加 .csproj 并使用 NuGet、

更新以下包解决了依赖性问题

<PackageReference Include="Microsoft.Composition" Version="1.0.27" ExcludeAssets="All" />  
<PackageReference Include="System.Composition" Version="1.0.31" />

.csproj 是

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>netcoreapp2.0</TargetFramework>
    <MvcRazorCompileOnPublish>true</MvcRazorCompileOnPublish>
    <AssetTargetFallback>$(AssetTargetFallback);portable-net45+win8+wp8+wpa81;</AssetTargetFallback>
    <UserSecretsId>***********</UserSecretsId>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.All" Version="2.0.0-preview2-final" />
    <PackageReference Include="Microsoft.AspNetCore.Authentication.Cookies" Version="2.0.0-preview2-final" />
    <PackageReference Include="Microsoft.AspNetCore.Identity" Version="2.0.0-preview2-final" />
    <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="2.0.0-preview2-final" />
    <PackageReference Include="Microsoft.Composition" Version="1.0.31" ExcludeAssets="All" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" Version="2.0.0-preview2-final" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="2.0.0-preview2-final" />
    <PackageReference Include="System.Composition" Version="1.1.0-preview2-25405-01" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="2.0.0-preview2-final" PrivateAssets="All" />
    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="2.0.0-preview2-final" PrivateAssets="All" />
  </ItemGroup>

  <ItemGroup>
    <DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="2.0.0-preview2-final" />
    <DotNetCliToolReference Include="Microsoft.Extensions.SecretManager.Tools" Version="2.0.0-preview2-final" />
    <DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="2.0.0-preview2-final" />
  </ItemGroup>

</Project>

Ref, Ref2

如何解决 ASP.NET.Core 2 包恢复相关的警告和错误

How to resolve ASP.NET.Core 2 Package restoration related warning and errors

asp.net

authentication

asp.net-core-2.0