Is there a way to refresh the DI object only (Blazor Server)

Question

I have an issue with Blazor Server:

my DI always get the same ID (instance) on the component's button click

For example: ILoginService.ID = "123"

When i click a button - if the login fails , and retry it will have the same instance ID ="123"

The dependency injection was defined below:

I am aware that if I refresh the page, the DI will work as expected (because it is scope service - new every request) . but it's not fit on my scenario.

I have to refresh the DI object only before or after the button click, so i have a new instance each button click

Is there a way to refresh the DI object only

Already changed the lifetime of DI to transient. Still not working

I was expecting the following

Before Click: ILoginService.ID = "123"

Then Login failed Retry Click ILoginService.ID = "456"

Answer 1

In Blazor Server, components may reuse the same instance of the component upon button clicks, which can affect the retrieval and management of service instances. Even if the service is transient, a new service instance might not be created due to component caching mechanisms.

So, to ensure that a new LoginService instance is obtained with each button click, you can create a new scope by using IServiceScopeFactory.

Below is my test demo:

LoginService:

public class LoginService : ILoginService
{
    public string ID { get; private set; } = Guid.NewGuid().ToString();
    // ...
}

Login.razor:

@page "/login"
@rendermode InteractiveServer
@inject IServiceScopeFactory ScopeFactory

<h3>Test</h3>

<button @onclick="HandleLogin">Login</button>
<p> ID: @id</p>

@code {
    private string id;

    private async Task HandleLogin()
    {
        using (var scope = ScopeFactory.CreateScope())
        {
            var loginService = scope.ServiceProvider.GetRequiredService<ILoginService>();
            id = loginService.ID;
        }
    }
}

Also register the service as:

builder.Services.AddScoped<ILoginService, LoginService>();

My test results:

First click:

Second click: