event, delegate に対するnullableアノテーションを追加

[opentween/open-tween.git] / OpenTween / NotifyPropertyChangedBase.cs

diff --git a/OpenTween/NotifyPropertyChangedBase.cs b/OpenTween/NotifyPropertyChangedBase.cs
index 7cf65b4..f75ea7e 100644 (file)
--- a/OpenTween/NotifyPropertyChangedBase.cs
+++ b/OpenTween/NotifyPropertyChangedBase.cs
@@ -36,7 +36,7 @@ namespace OpenTween
     /// </summary>
     public class NotifyPropertyChangedBase : INotifyPropertyChanged
     {
-        public event PropertyChangedEventHandler PropertyChanged;
+        public event PropertyChangedEventHandler? PropertyChanged;
 
         protected bool SetProperty<T>(ref T field, T value, [CallerMemberName] string propertyName = "")
         {