From 43357a5198118ef46e2c83a65fc6af33b4100399 Mon Sep 17 00:00:00 2001
From: zerodev1200 <42404360+zerodev1200@users.noreply.github.com>
Date: Sun, 20 Oct 2024 03:06:42 +0900
Subject: [PATCH] add handling for SynchronizationContext

---
 .../ICollectionEventDispatcher.cs                     | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/ObservableCollections/ICollectionEventDispatcher.cs b/src/ObservableCollections/ICollectionEventDispatcher.cs
index c2ccfa0..049f580 100644
--- a/src/ObservableCollections/ICollectionEventDispatcher.cs
+++ b/src/ObservableCollections/ICollectionEventDispatcher.cs
@@ -35,7 +35,16 @@ namespace ObservableCollections
 
         public void Post(CollectionEventDispatcherEventArgs ev)
         {
-            synchronizationContext.Post(callback, ev);
+            if (SynchronizationContext.Current == null)
+            {
+                // non-UI thread, post the event asynchronously
+                synchronizationContext.Post(callback, ev);
+            }
+            else
+            {
+                // UI thread, send the event synchronously
+                synchronizationContext.Send(callback, ev);
+            }
         }
 
         static void SendOrPostCallback(object? state)