From 30cf430bff008a3b8d74de2bfb001c40d1aa5023 Mon Sep 17 00:00:00 2001
From: Andrey Nasonov <andrey.nasonov@actonica.ru>
Date: Thu, 31 Mar 2022 10:41:32 +0700
Subject: [PATCH] Fixed long-running operations on SnackBarMessage callback
 (#2627)

actionClickWaitHandle will be disposed after message auto-closed. We need to avoid call any methods on disposed EventWaitHandle, need to check is it closed (disposed) or invalid
---
 MaterialDesignThemes.Wpf/SnackbarMessageQueue.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/MaterialDesignThemes.Wpf/SnackbarMessageQueue.cs b/MaterialDesignThemes.Wpf/SnackbarMessageQueue.cs
index 5110af6b44..c9679c58b7 100644
--- a/MaterialDesignThemes.Wpf/SnackbarMessageQueue.cs
+++ b/MaterialDesignThemes.Wpf/SnackbarMessageQueue.cs
@@ -384,6 +384,11 @@ private static Tuple<SnackbarMessage, MouseNotOverManagedWaitHandle> CreateAndSh
             {
                 if (++clickCount == 1)
                     DoActionCallback(messageQueueItem);
+
+                // Don't operate with eventWaitHandle if disposed/invalid
+                if (actionClickWaitHandle.SafeWaitHandle.IsInvalid || actionClickWaitHandle.SafeWaitHandle.IsClosed)
+                    return;
+
                 actionClickWaitHandle.Set();
             };
             snackbar.SetCurrentValue(Snackbar.MessageProperty, snackbarMessage);