FrontOffice/src/FrontOffice.Main/App.razor.cs

using Blazored.LocalStorage;
using FrontOffice.Main.Shared;
using FrontOffice.Main.Utilities;
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.WebUtilities;
using MudBlazor;

namespace FrontOffice.Main;

public partial class App
{
    [Inject] private ILocalStorageService LocalStorage { get; set; } = default!;
    [Inject] private AuthService AuthService { get; set; } = default!;
    protected override async Task OnInitializedAsync()
    {
        await base.OnInitializedAsync();

        // Check for referral code in URL query parameters
        var uri = Navigation.ToAbsoluteUri(Navigation.Uri);
        var query = QueryHelpers.ParseQuery(uri.Query);

        if (query.TryGetValue("ref", out var refValues))
        {
            var referralCode = refValues.FirstOrDefault();
            if (!string.IsNullOrWhiteSpace(referralCode))
            {
                // Store referral code in local storage
                await LocalStorage.SetItemAsync("referral:code", referralCode);

                if(!await AuthService.IsAuthenticatedAsync())
                {
                    var options = new DialogOptions
                    {
                        BackdropClick = false,
                        CloseOnEscapeKey = false
                    };

                    var parameters = new DialogParameters<AuthDialog>
                    {
                        { x => x.HideCancelButton, true }
                    };
                    var dialog = await DialogService.ShowAsync<AuthDialog>("ورود به حساب کاربری", parameters, options);
                    var result = await dialog.Result;

                    if (!result.Canceled)
                    {
                        Snackbar.Add(GlobalConstants.SuccessMsg, Severity.Success);
                        await Task.Delay(1000);
                        Navigation.NavigateTo(Navigation.Uri, forceLoad: true);
                        StateHasChanged();
                    }
                }
            }
        }
    }
}