adding Length property to LocalSession (#5)

adjusting associated test to target the correction storage interface

Author: ebekker

src/Blazor.Extensions.Storage/Storage.cs

@@ -35,6 +35,7 @@ public void SetItem<TItem>(string key, TItem item)
 
     public class LocalStorage
     {
+        public int Length => RegisteredFunction.Invoke<int>(MethodNames.LENGTH_METHOD, StorageTypeNames.LOCAL_STORAGE);
         public void Clear() => RegisteredFunction.InvokeUnmarshalled<object>(MethodNames.CLEAR_METHOD, StorageTypeNames.LOCAL_STORAGE);
 
         public TItem GetItem<TItem>(string key)

test/Blazor.Extensions.Storage.Test/Pages/Index.cshtml

@@ -15,19 +15,23 @@
         var key = "forecasts";
         SessionStorage.SetItem<WeatherForecast[]>(key, forecasts);
         LocalStorage.SetItem<WeatherForecast[]>(key, forecasts);
+
         var fromSession = SessionStorage.GetItem<WeatherForecast[]>(key);
         var fromLocal = LocalStorage.GetItem<WeatherForecast[]>(key);
 
         logger.LogInformation("From session storage:");
         logger.LogInformation(fromSession);
         logger.LogInformation("From local storage:");
         logger.LogInformation(fromLocal);
+
         logger.LogInformation($"Total in session: {SessionStorage.Length}");
-        logger.LogInformation($"Total in local: {SessionStorage.Length}");
+        logger.LogInformation($"Total in local: {LocalStorage.Length}");
+
         logger.LogInformation("Removing from session storage...");
         SessionStorage.RemoveItem(key);
         logger.LogInformation("Removing from local storage...");
         LocalStorage.RemoveItem(key);
+
         logger.LogInformation($"Total in session: {SessionStorage.Length}");
         logger.LogInformation($"Total in local: {SessionStorage.Length}");
     }