AccountPage layout and local storage functionality

 - load on show page and save via button

App.razor

-<UserDataComponent>
-    <Router AppAssembly="@typeof(Program).Assembly">
-        <Found Context="routeData">
-            <RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
-        </Found>
-        <NotFound>
-            <LayoutView Layout="@typeof(MainLayout)">
-                <p>Sorry, there's nothing at this address.</p>
-            </LayoutView>
-        </NotFound>
-    </Router>
-</UserDataComponent>
+<Router AppAssembly="@typeof(Program).Assembly">
+    <Found Context="routeData">
+        <RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
+    </Found>
+    <NotFound>
+        <LayoutView Layout="@typeof(MainLayout)">
+            <p>Sorry, there's nothing at this address.</p>
+        </LayoutView>
+    </NotFound>
+</Router>

Pages/AccountPage.razor

     <div class="row no-gutters align-items-start w-100">
         <div class="row no-gutters w-100" style="padding-top:2em">
             <div class="col-6" style="padding-right:0.5em">
-                <MatStringField Class="w-100" Label="Firstname" Outlined="true" type="text" @bind-Value="@State.Firstname"></MatStringField>
+                <MatStringField Class="w-100" Label="Firstname" Outlined="true" type="text" @bind-Value="@Account.Firstname"></MatStringField>
             </div>
             <div class="col-6" style="padding-left:0.5em">
-                <MatStringField Class="w-100" Label="Lastname" Outlined="true"  type="text" @bind-Value="@State.Lastname"></MatStringField>
+                <MatStringField Class="w-100" Label="Lastname" Outlined="true" type="text" @bind-Value="@Account.Lastname"></MatStringField>
             </div>
         </div>
         <div class="row no-gutters align-items-center w-100">
             <div class="col-12">
-                <MatStringField Class="w-100" Label="Address" Outlined="true" type="text" @bind-Value="@State.Address"></MatStringField>
+                <MatStringField Class="w-100" Label="Address" Outlined="true" type="text" @bind-Value="@Account.Address"></MatStringField>
             </div>
         </div>
         <div class="row no-gutters align-items-center w-100">
             <div class="col-4" style="padding-right:0.5em">
-                <MatStringField Class="w-100" Label="Zip" Outlined="true" type="text" @bind-Value="@State.Zip"></MatStringField>
+                <MatStringField Class="w-100" Label="Zip" Outlined="true" type="text" @bind-Value="@Account.Zip"></MatStringField>
             </div>
             <div class="col-8" style="padding-left:0.5em">
-                <MatStringField Class="w-100" Label="City" Outlined="true" type="text" @bind-Value="@State.City"></MatStringField>
+                <MatStringField Class="w-100" Label="City" Outlined="true" type="text" @bind-Value="@Account.City"></MatStringField>
             </div>
         </div>
         <div class="row no-gutters align-items-center w-100">
             <div class="col-12">
-                <MatStringField Class="w-100" Label="Phone" Outlined="true" type="text" @bind-Value="@State.Phone"></MatStringField>
+                <MatStringField Class="w-100" Label="Phone" Outlined="true" type="text" @bind-Value="@Account.Phone"></MatStringField>
             </div>
         </div>
         <div class="row no-gutters align-items-center w-100">
             <div class="col-12">
-                <MatStringField Class="w-100" Label="E-Mail" Outlined="true" type="text" @bind-Value="@State.Email"></MatStringField>
+                <MatStringField Class="w-100" Label="E-Mail" Outlined="true" type="text" @bind-Value="@Account.Email"></MatStringField>
             </div>
         </div>
     </div>
 
 @code {
 
-    async private void SaveUserData() {
+    protected async override void OnInitialized() {
+        await GetUserData();
+    }
+
+    private async void SaveUserData() {
         await UserDataProvider.Save();
     }
 
-    [CascadingParameter]
-    public UserData State { get; set; }
-}
+    private async Task GetUserData() {
+        await InvokeAsync(async () => {
+            await UserDataProvider.Get();
+            StateHasChanged();
+        });
+
+    }
+
+    private UserData  Account {
+            get => UserDataProvider.Data;
+        }
+
+  }
 

Shared/UserData.cs

 
 namespace CaritasPWA.Shared {
     // The class that stores the user settings
-    public class UserData : INotifyPropertyChanged {
+    public class UserData {
         private string firstname;
         private string lastname;
         private string address;
         private string email;
 
 
-        public string Firstname { get => firstname; set { firstname = value; RaisePropertyChanged(); } }
-        public string Lastname { get => lastname; set { lastname = value; RaisePropertyChanged(); } }
-        public string Email { get => email; set { email = value; RaisePropertyChanged(); } }
-        public string Address { get => address; set { address = value; RaisePropertyChanged(); }}
-        public string Zip { get => zip; set { zip = value; RaisePropertyChanged(); } }
-        public string City { get => city; set { city = value; RaisePropertyChanged(); } }
-        public string Phone { get => phone; set { phone = value; RaisePropertyChanged(); } }
-
-        public event PropertyChangedEventHandler PropertyChanged;
-
-        private void RaisePropertyChanged([CallerMemberName] string propertyName = null) {
-            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
-        }
+        public string Firstname { get => firstname; set { firstname = value; } }
+        public string Lastname { get => lastname; set { lastname = value; } }
+        public string Address { get => address; set { address = value; } }
+        public string Zip { get => zip; set { zip = value; } }
+        public string City { get => city; set { city = value; } }
+        public string Phone { get => phone; set { phone = value; } }
+        public string Email { get => email; set { email = value; } }
     }
 }

Shared/UserDataComponent.razor

-@inject UserDataProvider UserDataProvider
-@implements IDisposable
-
-@if (state == null) {
-    <p>loading...</p>
-} else {
-    <CascadingValue Value="@state" IsFixed="false">@ChildContent</CascadingValue>
-}
-
-@code{
-    private UserData state = null;
-
-    [Parameter]
-    public RenderFragment ChildContent { get; set; }
-
-    protected override async Task OnInitializedAsync() {
-        UserDataProvider.Changed += UserDataChanged;
-        await Refresh();
-    }
-
-    public void Dispose() {
-        UserDataProvider.Changed -= UserDataChanged;
-    }
-
-    private async void UserDataChanged(object sender, EventArgs e) {
-        await InvokeAsync(async () => {
-            await Refresh();
-            StateHasChanged();
-        });
-    }
-
-    private async Task Refresh() {
-        state = await UserDataProvider.Get();
-    }
-}

Shared/UserDataProvider.cs

 
 namespace CaritasPWA.Shared {
     public sealed class UserDataProvider {
-        private const string KeyName = "state";
+        private const string KeyName = "account";
 
         private readonly IJSRuntime _jsRuntime;
         private bool _initialized;
-        private UserData _data;
+        private UserData _data = new UserData();
 
+        public UserData Data { 
+            get => _data; 
+            set => _data = value; 
+        }
+        
         public event EventHandler Changed;
 
         public bool AutoSave { get; set; } = true;
         }
 
         public async ValueTask<UserData> Get() {
-            if (_data != null)
-                return _data;
 
             // Register the Storage event handler. This handler calls OnStorageUpdated when the storage changed.
             // This way, you can reload the settings when another instance of the application (tab / window) save the settings
                 result = new UserData();
             }
 
-            // Register the OnPropertyChanged event, so it automatically persists the settings as soon as a value is changed
-            result.PropertyChanged += OnPropertyChanged;
             _data = result;
             return result;
         }
             await _jsRuntime.InvokeVoidAsync("BlazorSetLocalStorage", KeyName, json);
         }
 
-        // Automatically persist the settings when a property changed
-        private async void OnPropertyChanged(object sender, PropertyChangedEventArgs e) {
-            if (AutoSave) {
-                await Save();
-            }
-        }
-
         // This method is called from BlazorRegisterStorageEvent when the storage changed
         [JSInvokable]
         public void OnStorageUpdated(string key) {