修改了开启Mqtt和关闭Mqtt时的事件

Models/Mqtt.cs

@@ -8,6 +8,8 @@ namespace PMSWPF.Models;
 /// </summary>
 public partial class Mqtt : ObservableObject
 {
+    public event Action<Mqtt> OnMqttIsActiveChanged; 
+    
     /// <summary>
     /// MQTT客户端ID。
     /// </summary>
@@ -34,6 +36,17 @@ public partial class Mqtt : ObservableObject
     [ObservableProperty]
     private bool _isActive;
 
+    partial void OnIsActiveChanged(bool value)
+    {
+        OnMqttIsActiveChanged?.Invoke(this);
+    }
+
+    /// <summary>
+    /// 显示连接的消息：
+    /// </summary>
+    [ObservableProperty]
+    private string connectMessage;
+
     /// <summary>
     /// 是否设置为默认MQTT客户端。
     /// </summary>

Services/MqttBackgroundService.cs

@@ -6,6 +6,8 @@ using System.Threading.Tasks;
 using Microsoft.Extensions.Hosting;
 using MQTTnet;
 using MQTTnet.Client;
+using MQTTnet.Client.Connecting;
+using MQTTnet.Client.Disconnecting;
 using MQTTnet.Client.Options;
 using PMSWPF.Models;
 using PMSWPF.Services;
@@ -28,6 +30,9 @@ namespace PMSWPF.Services
         // 存储MQTT配置的字典，键为MQTT配置ID，值为Mqtt模型对象。
         private readonly Dictionary<int, Mqtt> _mqttConfigDic;
 
+        // 存储每个客户端重连尝试次数的字典
+        private readonly Dictionary<int, int> _reconnectAttempts;
+
 
         // 定时器，用于周期性地执行数据发布任务。
         private Timer _timer;
@@ -45,6 +50,7 @@ namespace PMSWPF.Services
             _dataServices = dataServices;
             _mqttClients = new Dictionary<int, IMqttClient>();
             _mqttConfigDic = new Dictionary<int, Mqtt>();
+            _reconnectAttempts = new Dictionary<int, int>();
         }
 
         /// <summary>
@@ -61,23 +67,23 @@ namespace PMSWPF.Services
             _serviceMainThread.IsBackground = true;
             _serviceMainThread.Name = "MqttServiceMainThread";
             _serviceMainThread.Start();
-            
         }
 
         private void Execute()
         {
             while (!_stopEvent.WaitOne(0))
             {
-                if (_dataServices.Mqtts==null || _dataServices.Mqtts.Count==0)
+                if (_dataServices.Mqtts == null || _dataServices.Mqtts.Count == 0)
                 {
                     _reloadEvent.Reset();
                     continue;
                 }
 
                 _reloadEvent.WaitOne();
+
                 // 初始加载MQTT配置和变量数据。
                 LoadMqttConfigurations();
-                ConnectMqttClient();
+                ConnectMqttList();
 
                 _reloadEvent.Reset();
             }
@@ -87,7 +93,7 @@ namespace PMSWPF.Services
         /// <summary>
         /// 停止MQTT后台服务。
         /// </summary>
-        public  void StopService()
+        public void StopService()
         {
             NlogHelper.Info("Mqtt后台服务开始停止...."); // 记录服务停止信息
 
@@ -95,24 +101,32 @@ namespace PMSWPF.Services
             // 取消订阅事件。
             _dataServices.OnMqttListChanged -= HandleMqttListChanged;
 
-            // 断开所有已连接的MQTT客户端。
+            DisconnecetAll();
-            foreach (var mqttId in _mqttClients.Keys.ToList())
-            {
-                var client=_mqttClients[mqttId];
-                var mqtt=_mqttConfigDic[mqttId];
-                mqtt.IsConnected = false;
-                if (client.IsConnected)
-                {
-                    client.DisconnectAsync().GetAwaiter().GetResult();
-                }
-            }
 
             // 清空所有字典。
             _mqttClients.Clear();
             _mqttConfigDic.Clear();
+            _reconnectAttempts.Clear();
             NlogHelper.Info("Mqtt后台服务已停止。"); // 记录服务停止信息
         }
 
+        private void DisconnecetAll()
+        {
+            // 断开所有已连接的MQTT客户端。
+            foreach (var mqttId in _mqttClients.Keys.ToList())
+            {
+                var client = _mqttClients[mqttId];
+                var mqtt = _mqttConfigDic[mqttId];
+                mqtt.IsConnected = false;
+                if (client.IsConnected)
+                {
+                    client.DisconnectAsync()
+                          .GetAwaiter()
+                          .GetResult();
+                }
+            }
+        }
+
 
         /// <summary>
         /// 加载并连接MQTT配置。
@@ -121,90 +135,76 @@ namespace PMSWPF.Services
         private void LoadMqttConfigurations()
         {
             NlogHelper.Info("开始加载Mqtt配置文件...");
+            _mqttConfigDic.Clear();
             // 从数据服务获取所有MQTT配置。
             var _mqttConfigList = _dataServices.Mqtts.Where(m => m.IsActive)
                                                .ToList();
             foreach (var mqtt in _mqttConfigList)
             {
+                mqtt.OnMqttIsActiveChanged += OnMqttIsActiveChangedHandler;
                 _mqttConfigDic[mqtt.Id] = mqtt;
+                mqtt.ConnectMessage = "配置加载成功.";
             }
+
             NlogHelper.Info($"Mqtt配置文件加载成功，开启的Mqtt客户端：{_mqttConfigList.Count}个。");
         }
 
+        private async void OnMqttIsActiveChangedHandler(Mqtt mqtt)
+        {
+            try
+            {
+                if (mqtt.IsActive)
+                {
+                    await ConnectMqtt(mqtt);
+                }
+                else
+                {
+                    if (!_mqttClients.TryGetValue(mqtt.Id,out var client))
+                    {
+                        NlogHelper.Warn($"没有在Mqtt连接字典中找到名字为：{mqtt.Name}的连接。");
+                        return;
+                    }
+
+                    if (client.IsConnected)
+                    {
+                        await  client.DisconnectAsync();
+                    }
+
+                    mqtt.IsConnected = false;
+                    mqtt.ConnectMessage = "断开连接.";
+
+                    _mqttClients.Remove(mqtt.Id);
+                    NlogHelper.Info($"{mqtt.Name}的客户端，与服务器断开连接.");
+
+                }
+            }
+            catch (Exception e)
+            {
+                NotificationHelper.ShowError($"{mqtt.Name}客户端，开启或关闭的过程中发生了错误:{e.Message}",e);
+            }
+            
+        }
+
         /// <summary>
         /// 连接到指定的MQTT代理。
         /// </summary>
         /// <param name="mqtt">MQTT配置对象。</param>
         /// <returns>表示异步操作的任务。</returns>
-        private void ConnectMqttClient()
+        private async Task ConnectMqttList()
         {
             foreach (Mqtt mqtt in _mqttConfigDic.Values.ToList())
             {
                 try
                 {
-                    NlogHelper.Info($"开始连接：{mqtt.Name}的服务器...");
+                    if (_mqttClients.TryGetValue(mqtt.Id, out var mclient) && mclient.IsConnected)
-                    // 创建MQTT客户端工厂和客户端实例。
-                    var factory = new MqttFactory();
-                    var client = factory.CreateMqttClient();
-                    // 构建MQTT客户端连接选项。
-                    var options = new MqttClientOptionsBuilder()
-                                  .WithClientId(mqtt.ClientID)
-                                  .WithTcpServer(mqtt.Host, mqtt.Port)
-                                  .WithCredentials(mqtt.UserName, mqtt.PassWord)
-                                  .WithCleanSession() // 清理会话，每次连接都是新会话
-                                  .Build();
-                    
-                    // 设置连接成功事件处理程序。
-                    client.UseConnectedHandler(async e =>
                     {
-                        NotificationHelper.ShowSuccess($"已连接到MQTT服务器: {mqtt.Name}");
+                        NlogHelper.Info($"{mqtt.Name}的Mqtt服务器连接已存在。");
+                        mqtt.ConnectMessage = "连接成功.";
                         mqtt.IsConnected = true;
+                        continue;
+                    }
 
-                        // 订阅主题
+                    await  ConnectMqtt(mqtt);
-                        await client.SubscribeAsync(new MqttTopicFilterBuilder().WithTopic(mqtt.SubTopic).Build());
-                        NlogHelper.Info($"MQTT客户端 {mqtt.Name} 已订阅主题: {mqtt.SubTopic}");
-                    });
-
-                    // 设置接收消息处理程序
-                    client.UseApplicationMessageReceivedHandler(e =>
-                    {
-                        var topic = e.ApplicationMessage.Topic;
-                        var payload = System.Text.Encoding.UTF8.GetString(e.ApplicationMessage.Payload);
-                        NlogHelper.Info($"MQTT客户端 {mqtt.Name} 收到消息: 主题={topic}, 消息={payload}");
-
-                        // 在这里添加处理消息的逻辑
-                    });
-
-                    // 设置断开连接事件处理程序。
-                    client.UseDisconnectedHandler(async e =>
-                    {
-                        NotificationHelper.ShowWarn($"与MQTT服务器断开连接: {mqtt.Name}");
-                        mqtt.IsConnected = false;
-                        // 服务停止
-                        if (_stopEvent.WaitOne(0))
-                            return;
-                        if (!mqtt.IsActive)
-                            return;
-                        
-                        NlogHelper.Info($"5秒后重新连接Mqtt服务器：{mqtt.Name}");
-                        // 尝试重新连接。
-                        await Task.Delay(TimeSpan.FromSeconds(5)); // 等待5秒后重连
-                        try
-                        {
-                            await client.ConnectAsync(options, CancellationToken.None);
-                        }
-                        catch (Exception ex)
-                        {
-                            NlogHelper.Error($"重新与Mqtt服务器连接失败: {mqtt.Name}", ex);
-                        }
-                    });
-
-                    // 尝试连接到MQTT代理。
-                    client.ConnectAsync(options, CancellationToken.None)
-                          .GetAwaiter()
-                          .GetResult();
-                    // 将连接成功的客户端添加到字典。
-                    _mqttClients[mqtt.Id] = client;
                 }
                 catch (Exception ex)
                 {
@@ -213,6 +213,110 @@ namespace PMSWPF.Services
             }
         }
 
+        private async Task ConnectMqtt(Mqtt mqtt)
+        {
+            NlogHelper.Info($"开始连接：{mqtt.Name}的服务器...");
+            mqtt.ConnectMessage = "开始连接服务器...";
+            // 创建MQTT客户端工厂和客户端实例。
+            var factory = new MqttFactory();
+            var client = factory.CreateMqttClient();
+            // 构建MQTT客户端连接选项。
+            var options = new MqttClientOptionsBuilder()
+                          .WithClientId(mqtt.ClientID)
+                          .WithTcpServer(mqtt.Host, mqtt.Port)
+                          .WithCredentials(mqtt.UserName, mqtt.PassWord)
+                          .WithCleanSession() // 清理会话，每次连接都是新会话
+                          .Build();
+
+            // 设置连接成功事件处理程序。
+            client.UseConnectedHandler(async (e) => { await HandleConnected(e, client, mqtt); });
+
+            // 设置接收消息处理程序
+            client.UseApplicationMessageReceivedHandler(e => { HandleMessageReceived(e, mqtt); });
+
+            // 设置断开连接事件处理程序。
+            client.UseDisconnectedHandler(async (e) => await HandleDisconnected(e,options, client, mqtt));
+
+            // 尝试连接到MQTT代理。
+           await  client.ConnectAsync(options, CancellationToken.None);
+           
+            // 将连接成功的客户端添加到字典。
+            _mqttClients[mqtt.Id] = client;
+        }
+
+        private static void HandleMessageReceived(MqttApplicationMessageReceivedEventArgs e, Mqtt mqtt)
+        {
+            var topic = e.ApplicationMessage.Topic;
+            var payload = System.Text.Encoding.UTF8.GetString(e.ApplicationMessage.Payload);
+            NlogHelper.Info($"MQTT客户端 {mqtt.Name} 收到消息: 主题={topic}, 消息={payload}");
+
+            // 在这里添加处理消息的逻辑
+        }
+
+        private async Task HandleDisconnected(MqttClientDisconnectedEventArgs args, IMqttClientOptions options,
+                                              IMqttClient client,
+                                              Mqtt mqtt)
+        {
+            NotificationHelper.ShowWarn($"与MQTT服务器断开连接: {mqtt.Name}");
+            mqtt.ConnectMessage = "断开连接.";
+            mqtt.IsConnected = false;
+            // 服务停止
+            if (_stopEvent.WaitOne(0) || !mqtt.IsActive)
+                return;
+
+            // 增加重连尝试次数
+            if (!_reconnectAttempts.ContainsKey(mqtt.Id))
+            {
+                _reconnectAttempts[mqtt.Id] = 0;
+            }
+
+            _reconnectAttempts[mqtt.Id]++;
+
+            // 指数退避策略
+            var maxDelay = TimeSpan.FromMinutes(5); // 最大延迟5分钟
+            var baseDelay = TimeSpan.FromSeconds(5); // 基础延迟5秒
+            var delay = TimeSpan.FromSeconds(baseDelay.TotalSeconds *
+                                             Math.Pow(2, _reconnectAttempts[mqtt.Id] - 1));
+            if (delay > maxDelay)
+            {
+                delay = maxDelay;
+            }
+
+            NlogHelper.Info(
+                $"与MQTT服务器：{mqtt.Name} 的连接已断开。将在 {delay.TotalSeconds} 秒后尝试第 {_reconnectAttempts[mqtt.Id]} 次重新连接...");
+
+            mqtt.ConnectMessage = $"连接已断开。将在 {delay.TotalSeconds} 秒后尝试第 {_reconnectAttempts[mqtt.Id]} 次重新连接...";
+            await Task.Delay(delay);
+            try
+            {
+                mqtt.ConnectMessage = $"开始重新连接服务器...";
+                await client.ConnectAsync(options, CancellationToken.None);
+            }
+            catch (Exception ex)
+            {
+                mqtt.ConnectMessage = $"重新与Mqtt服务器连接失败.";
+                NlogHelper.Error($"重新与Mqtt服务器连接失败: {mqtt.Name}", ex);
+            }
+        }
+
+        private async Task HandleConnected(MqttClientConnectedEventArgs args, IMqttClient client, Mqtt mqtt)
+        {
+            // 重置重连尝试次数
+            if (_reconnectAttempts.ContainsKey(mqtt.Id))
+            {
+                _reconnectAttempts[mqtt.Id] = 0;
+            }
+
+            NotificationHelper.ShowSuccess($"已连接到MQTT服务器: {mqtt.Name}");
+            mqtt.IsConnected = true;
+            mqtt.ConnectMessage = "连接成功.";
+
+            // 订阅主题
+            await client.SubscribeAsync(new MqttTopicFilterBuilder().WithTopic(mqtt.SubTopic)
+                                                                    .Build());
+            NlogHelper.Info($"MQTT客户端 {mqtt.Name} 已订阅主题: {mqtt.SubTopic}");
+        }
+
 
         /// <summary>
         /// 处理MQTT列表变化事件的回调方法。

ViewModels/MqttsViewModel.cs

@@ -19,33 +19,33 @@ public partial class MqttsViewModel : ViewModelBase
     private readonly MqttRepository _mqttRepository;
     private readonly ILogger<MqttsViewModel> _logger;
     private readonly NavgatorServices _navgatorServices;
-
+    [ObservableProperty]
     private ObservableCollection<Mqtt> _mqtts;
 
-    public ObservableCollection<Mqtt> Mqtts
+    // public ObservableCollection<Mqtt> Mqtts
-    {
+    // {
-        get => _mqtts;
+    //     get => _mqtts;
-        set
+    //     set
-        {
+    //     {
-            if (_mqtts != null)
+    //         if (_mqtts != null)
-            {
+    //         {
-                foreach (var mqtt in _mqtts)
+    //             foreach (var mqtt in _mqtts)
-                {
+    //             {
-                    mqtt.PropertyChanged -= Mqtt_PropertyChanged;
+    //                 mqtt.PropertyChanged -= Mqtt_PropertyChanged;
-                }
+    //             }
-            }
+    //         }
-
+    //
-            SetProperty(ref _mqtts, value);
+    //         SetProperty(ref _mqtts, value);
-
+    //
-            if (_mqtts != null)
+    //         if (_mqtts != null)
-            {
+    //         {
-                foreach (var mqtt in _mqtts)
+    //             foreach (var mqtt in _mqtts)
-                {
+    //             {
-                    mqtt.PropertyChanged += Mqtt_PropertyChanged;
+    //                 mqtt.PropertyChanged += Mqtt_PropertyChanged;
-                }
+    //             }
-            }
+    //         }
-        }
+    //     }
-    }
+    // }
 
     [ObservableProperty]
     private Mqtt _selectedMqtt;

Views/MqttsView.xaml

@@ -136,6 +136,14 @@
                                          FontSize="14" />
                             <TextBlock Text="{Binding ConnTime}" />
                         </StackPanel>
+                        <StackPanel Orientation="Horizontal"
+                                    Margin="0,2">
+                            <ui:FontIcon Icon="{x:Static ui:SegoeFluentIcons.Message}"
+                                         VerticalAlignment="Center"
+                                         Margin="0,0,8,0"
+                                         FontSize="14" />
+                            <TextBlock Text="{Binding ConnectMessage}" />
+                        </StackPanel>
                         <StackPanel Orientation="Horizontal"
                                     Margin="0,2">
                             <ui:FontIcon Icon="{x:Static ui:SegoeFluentIcons.FavoriteStar}"