Aggiunto helper estrazione querystring

EgwCoreLib.Razor/NavigationManagerExtension.cs

@@ -0,0 +1,44 @@
+using Microsoft.AspNetCore.Components;
+using Microsoft.AspNetCore.WebUtilities;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace EgwCoreLib.Razor
+{
+    public static class NavigationManagerExtension
+    {
+        #region Public Methods
+
+        /// <summary>
+        /// Estensione metodo NavigationManager
+        ///
+        /// 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;
+        }
+
+        #endregion Public Methods
+    }
+}