Method not found: 'Void Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommandBuilderFactory..ctor(Microsoft.EntityFrameworkCore.Diagnostics.IDiagnosticsLogger`1<Command>, Microsoft.EntityFrameworkCore.Storage.IRelationalTypeMapper)'.
解决方案：
编辑项目.csproj文件，在<ItemGroup>配置加入
<PackageReference Include="Pomelo.EntityFrameworkCore.MySql" Version="2.1.0-rc1-final" />