From f840582c15e64415a3f4f8b301866c8110e58aac Mon Sep 17 00:00:00 2001
From: wulf <yeshusuper@qq.com>
Date: Mon, 8 Jun 2015 12:04:33 +0800
Subject: [PATCH] on multi-thread the sequential will throw
 System.ArgumentOutOfRangeException

---
 .../NotificationService.cs                          | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/JdSoft.Apple.Apns.Notifications/NotificationService.cs b/JdSoft.Apple.Apns.Notifications/NotificationService.cs
index 6cd3844..1385e7a 100644
--- a/JdSoft.Apple.Apns.Notifications/NotificationService.cs
+++ b/JdSoft.Apple.Apns.Notifications/NotificationService.cs
@@ -467,11 +467,14 @@ void newCon_Connecting(object sender)
 
         private bool queueSequential(Notification notification)
 		{
-			if (sequential > notificationConnections.Count - 1)
-				sequential = 0;
-
-			if (notificationConnections[sequential] != null)
-				return notificationConnections[sequential++].QueueNotification(notification);
+            var index = sequential;
+            if (index > notificationConnections.Count - 1)
+                sequential = index = 0;
+            else
+                sequential++;
+
+            if (notificationConnections[index] != null)
+                return notificationConnections[index].QueueNotification(notification);
 			
 			return false;
 		}