From 600a300d902b80e4125c746e94ab53edf62fac4b Mon Sep 17 00:00:00 2001
From: hadashiA <dev@hadashikick.jp>
Date: Fri, 16 Feb 2024 17:37:57 +0900
Subject: [PATCH] Fix to emit INotifyCollectionChanged.OnPropertyChanged

---
 sandbox/ConsoleApp/Program.cs                               | 6 +++---
 .../Internal/NotifyCollectionChangedSynchronizedView.cs     | 2 ++
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/sandbox/ConsoleApp/Program.cs b/sandbox/ConsoleApp/Program.cs
index 0a55a4c..acc7987 100644
--- a/sandbox/ConsoleApp/Program.cs
+++ b/sandbox/ConsoleApp/Program.cs
@@ -44,7 +44,7 @@ foreach (var (x, xs) in viewModels)
 class ViewModel
 {
     public int Id { get; set; }
-    public string Value { get; set; }
+    public string Value { get; set; } = default!;
 }
 
 class HogeFilter : ISynchronizedViewFilter<int, ViewModel>
@@ -65,8 +65,8 @@ class HogeFilter : ISynchronizedViewFilter<int, ViewModel>
     }
 
     public void OnCollectionChanged(
-        ChangedKind changedKind, 
-        int value, 
+        ChangedKind changedKind,
+        int value,
         ViewModel view,
         in NotifyCollectionChangedEventArgs<int> eventArgs)
     {
diff --git a/src/ObservableCollections/Internal/NotifyCollectionChangedSynchronizedView.cs b/src/ObservableCollections/Internal/NotifyCollectionChangedSynchronizedView.cs
index b496115..522c62f 100644
--- a/src/ObservableCollections/Internal/NotifyCollectionChangedSynchronizedView.cs
+++ b/src/ObservableCollections/Internal/NotifyCollectionChangedSynchronizedView.cs
@@ -66,9 +66,11 @@ namespace ObservableCollections.Internal
             {
                 case ChangedKind.Add:
                     CollectionChanged?.Invoke(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, view, eventArgs.NewStartingIndex));
+                    PropertyChanged?.Invoke(this, CountPropertyChangedEventArgs);
                     return;
                 case ChangedKind.Remove:
                     CollectionChanged?.Invoke(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, view, eventArgs.OldStartingIndex));
+                    PropertyChanged?.Invoke(this, CountPropertyChangedEventArgs);
                     break;
                 case ChangedKind.Move:
                     CollectionChanged?.Invoke(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Move, view, eventArgs.NewStartingIndex, eventArgs.OldStartingIndex));