v4.0.0 (#1357)

Source/MQTTnet/Client/Unsubscribing/MqttClientUnsubscribeResult.cs

@@ -1,9 +1,31 @@
-using System.Collections.Generic;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
 
-namespace MQTTnet.Client.Unsubscribing
+using System.Collections.Generic;
+using MQTTnet.Packets;
+
+namespace MQTTnet.Client
 {
-    public class MqttClientUnsubscribeResult
+    public sealed class MqttClientUnsubscribeResult
     {
-        public List<MqttClientUnsubscribeResultItem> Items { get; }  =new List<MqttClientUnsubscribeResultItem>();
+        public IReadOnlyCollection<MqttClientUnsubscribeResultItem> Items { get; internal set; }
+
+        /// <summary>
+        /// Gets the user properties which were part of the UNSUBACK packet.
+        /// MQTTv5 only.
+        /// </summary>
+        public IReadOnlyCollection<MqttUserProperty> UserProperties { get; internal set; }
+        
+        /// <summary>
+        /// Gets the reason string.
+        /// MQTTv5 only.
+        /// </summary>
+        public string ReasonString { get; internal set; }
+        
+        /// <summary>
+        /// Gets the packet identifier which was used.
+        /// </summary>
+        public ushort PacketIdentifier { get; internal set; }
     }
 }