ConfigurationBuilder does not contain setBasePath asp core code example
Example: setbasepath configurationbuilder
<ItemGroup>
<PackageReference Include="Microsoft.Extensions.Configuration" Version="2.2.0" />
<PackageReference Include="Microsoft.Extensions.Configuration.FileExtensions" Version="2.2.0" />
<PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="2.2.0" />
</ItemGroup>