无法升级或降级 NuGet 包

Question

我有一个 ASP.NET 核心网站，它依赖于 2 个 class 库。

他们都引用了 Microsoft.NETCore 但版本不知何故混淆了，导致我收到警告：

Detected package downgrade: Microsoft.NETCore.App from 1.1.0 to 1.0.3

NuGet 不允许我更改 Microsoft.NetCore.App 的版本:

如果我尝试升级或降级，我收到错误

Following versions are unavailable due to additional constraints in the project or packages.config

如何解决这个错误？

我的 csproj 文件：

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

  <PropertyGroup>
    <TargetFramework>netcoreapp1.0</TargetFramework>
    <PreserveCompilationContext>true</PreserveCompilationContext>
    <AssemblyName>AutomotiveWebPortalCore</AssemblyName>
    <OutputType>Exe</OutputType>
    <PackageId>AutomotiveWebPortalCore</PackageId>
    <UserSecretsId>aspnet-AutomotiveWebPortalCore-20170223120414</UserSecretsId>
    <RuntimeFrameworkVersion>1.0.3</RuntimeFrameworkVersion>
    <PackageTargetFallback>$(PackageTargetFallback);dotnet</PackageTargetFallback>
  </PropertyGroup>

  <ItemGroup>
    <Content Update="wwwroot\**\*;Views\**\*;Areas\**\Views;appsettings.json;web.config">
      <CopyToPublishDirectory>PreserveNewest</CopyToPublishDirectory>
    </Content>
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="AutoMapper" Version="5.2.0" />
    <PackageReference Include="AutoMapper.Extensions.Microsoft.DependencyInjection" Version="1.2.0" />
    <PackageReference Include="DevExtreme.AspNet.Core" Version="16.2.4" />
    <PackageReference Include="DevExtreme.AspNet.Data" Version="1.2.4" />
    <PackageReference Include="Microsoft.AspNetCore.Diagnostics" Version="1.0.1" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="1.0.2" />
    <PackageReference Include="Microsoft.AspNetCore.Server.IISIntegration" Version="1.0.1" />
    <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel" Version="1.0.2" />
    <PackageReference Include="Microsoft.AspNetCore.StaticFiles" Version="1.0.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="1.1.0" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" Version="1.1.0" />
    <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="1.0.1" />
    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="1.0.1" />
    <PackageReference Include="Microsoft.Extensions.Logging" Version="1.1.0" />
    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="1.0.1" />
    <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="1.0.1" />
    <PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="1.0.1" />
    <PackageReference Include="Microsoft.VisualStudio.Web.BrowserLink.Loader" Version="14.0.1" />
    <PackageReference Include="bootstrap" Version="3.3.7" />
    <PackageReference Include="HubSpot.Tether" Version="1.1.1" />
  </ItemGroup>

  <Target Name="PrepublishScript" BeforeTargets="PrepareForPublish">
  </Target>

  <ItemGroup>
    <DotNetCliToolReference Include="BundlerMinifier.Core" Version="2.2.301" />
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\AutomotiveDAL\AutomotiveDAL.csproj" />
    <ProjectReference Include="..\AutomotiveDTO\AutomotiveDTO.csproj" />
  </ItemGroup>

</Project>

编辑：

以下是我的 class 库的参考资料：

数据访问层：

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

  <PropertyGroup>
    <TargetFramework>netcoreapp1.0</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="AutoMapper" Version="5.2.0" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" Version="1.1.0" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="1.1.0" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="1.1.0-msbuild3-final" />
  </ItemGroup>

</Project>

数据传输对象：

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

  <PropertyGroup>
    <TargetFramework>netcoreapp1.0</TargetFramework>
  </PropertyGroup>

</Project>

Answer 1

"Following versions are unavailable due to additional constraints" 消息似乎甚至出现在全新的空 ASP.NET 核心项目中。我认为这是 NuGet GUI 的错误或功能。（我使用的是 Visual Studio 2017 的最终发行版）

您可以通过直接编辑 .csproj 文件来解决此问题：在解决方案资源管理器中右键单击该项目，然后 select 编辑 (项目名称).csproj .

您可以在第一个 PropertyGroup 中提升 Microsoft.NETCore.App（和目标框架）的版本：

<PropertyGroup>
  <TargetFramework>netcoreapp1.1</TargetFramework>

  <!-- snip -->

  <RuntimeFrameworkVersion>1.1.0</RuntimeFrameworkVersion>

  <!-- snip -->
</PropertyGroup>

然后，关闭文件并重建项目。我用你在问题中提到的所有 (public) 依赖项测试了这个，没有发现任何包版本冲突。

无法升级或降级 NuGet 包

Can't upgrade or downgrade NuGet package

nuget

.net-core

asp.net-core

visual-studio-2017