无法为“.NETCoreApp,Version=v3.1”解析“Microsoft.EntityFrameworkCore (>= 3.1.7)”

Question

得到错误： Unable to resolve 'Microsoft.EntityFrameworkCore (>= 3.1.7)' for '.NETCoreApp,Version=v3.1

项目文件如下所示：

有没有人遇到过这个问题？

  <PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="3.1.7" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="3.1.7">
      <publicAssets>all</publicAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageReference>
    <PackageReference Include="Pomelo.EntityFrameworkCore.MySql" Version="3.1.2" />
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\RDS_Models\RDS_Models.csproj" />
  </ItemGroup>

</Project>

Answer 1

尝试升级到 .NET Core 3.1.8 和所有依赖项。 https://github.com/dotnet/core/releases

尝试更新 Visual Studio。

一切都会好的。