mapo-core/MP.SPEC/Extensions/NavigationManagerExtension.cs

using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.WebUtilities;
using System.ComponentModel;

namespace MP.SPEC.Extensions
{
    public static class NavigationManagerExtension
    {
        #region Public Methods

        /// <summary>
        /// Estensione metodo NavigationManager x recupero querystring int/string
        ///
        /// https://code-maze.com/query-strings-blazor-webassembly/
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="navManager"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static T? ExtractQueryStringByKey<T>(this NavigationManager navManager, string key)
        {
            var uri = navManager.ToAbsoluteUri(navManager.Uri);
            QueryHelpers.ParseQuery(uri.Query)
                .TryGetValue(key, out var queryValue);

            if (typeof(T).Equals(typeof(int)))
            {
                int.TryParse(queryValue, out int result);
                return (T)(object)result;
            }

            if (typeof(T).Equals(typeof(string)))
                return (T)(object)queryValue.ToString();

            return default;
        }

        /// <summary>
        /// Estensione metodo NavigationManager x recupero querystring di ogni tipo 
        /// 
        /// es: navManager.ExtractQueryStringByKey<bool>("isAdmin")
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="navManager"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static T? ExtractQueryStringByKeyGeneric<T>(this NavigationManager navManager, string key)
        {
            var uri = navManager.ToAbsoluteUri(navManager.Uri);

            // Estrai il valore associato alla chiave
            if (!QueryHelpers.ParseQuery(uri.Query).TryGetValue(key, out var queryValue))
            {
                return default;
            }

            var stringValue = queryValue.ToString();

            try
            {
                // Ottieni il convertitore dinamico per il tipo T
                var converter = TypeDescriptor.GetConverter(typeof(T));
                if (converter != null && converter.CanConvertFrom(typeof(string)))
                {
                    return (T?)converter.ConvertFromString(stringValue);
                }

                // Fallback nel caso il convertitore standard non basti
                return (T?)Convert.ChangeType(stringValue, typeof(T));
            }
            catch
            {
                // Se la conversione fallisce (es. il testo non è un numero valido), ritorna il default
                return default;
            }
        }

        /// <summary>
        /// Recupero base page
        /// 
        /// https://stackoverflow.com/questions/50102726/navigationmanager-get-current-url-in-a-blazor-component
        /// </summary>
        /// <param name="navigation"></param>
        /// <returns></returns>
        public static string Page(this NavigationManager navigation)
        {
            return navigation.Uri.Substring(navigation.BaseUri.Length);
        }

        #endregion Public Methods
    }
}