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@page "/ElmRef"

<ShowChildElementReferenceIdComponent DummyValue="test"/>

<div @ref="divElementReferenceOfParent"></div>
<ShowParentElementReferenceIdComponent DummyValue="test" ParentElementReference="divElementReferenceOfParent"/>

@code {
    private ElementReference divElementReferenceOfParent;
}

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using System;
using System.Linq;
using System.Reflection;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

namespace Sample.GenericHost
{

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public interface IInstall
{
    void install(IServiceCollection services, IConfiguration configuration);
}

public class DbInstaller : IInstall
{
    public void install(IServiceCollection services, IConfiguration configuration)
    {
        services.AddDbContext<DbContext>(opt => opt.UseSqlServer(configuration.GetConnectionString("DefaultConnection")));