.net DIの有効期間

public class SingletonClass {
    public int Count { get; set; }
    public EventHandler? SingletonEvent { get; set; }
    public void BubbleSingletonEvent(object? sender, EventArgs e) {
        if (SingletonEvent != null) {
            SingletonEvent.Invoke(sender,e);
        }
    }
}
public class ScopedClass {
    public int Count { get; set;}
}
public class TransientClass {
    public int Count { get; set;}
}

・・・
var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddRazorComponents()
    .AddInteractiveServerComponents();
// Singleton
builder.Services.AddSingleton<SingletonClass>();
// Scoped
builder.Services.AddScoped<ScopedClass>();
// Transient
builder.Services.AddTransient<TransientClass>();
・・・

@page "/counter"
@rendermode InteractiveServer
@inject SingletonClass sic
@inject ScopedClass scp
@inject TransientClass trn

<PageTitle>Counter</PageTitle>

<h1>Counter</h1>

<p role="status">Current count: @currentCount</p>
<p role="status">Singleton: @sic.Count</p>
<p role="status">Scoped: @scp.Count</p>
<p role="status">Transient: @trn.Count</p>

<button class="btn btn-primary" @onclick="IncrementCount">Click me</button>

@code {
    private int currentCount = 0;

    protected override void OnInitialized() {
        // Singletonインスタンスへイベントハンドラを設定
        sic.SingletonEvent += (sender,e) => this.InvokeAsync(this.StateHasChanged);
    }

    private void IncrementCount()
    {
        // それぞれインクリメント
        currentCount++;
        sic.Count++;
        scp.Count++;
        trn.Count++;
        // Singletonインスタンスのイベントを発生させる
        sic.BubbleSingletonEvent(this,new EventArgs());
    }
}