修改了Mqtt服务器启动不加载的问题

DMS.Application/DTOs/Events/MqttServerChangedEventArgs.cs

@@ -0,0 +1,37 @@
+using System;
+
+namespace DMS.Application.DTOs.Events
+{
+    /// <summary>
+    /// MQTT服务器变更事件参数
+    /// </summary>
+    public class MqttServerChangedEventArgs : System.EventArgs
+    {
+        /// <summary>
+        /// 变更类型
+        /// </summary>
+        public DataChangeType ChangeType { get; }
+
+        /// <summary>
+        /// MQTT服务器DTO
+        /// </summary>
+        public MqttServerDto MqttServer { get; }
+
+        /// <summary>
+        /// 变更时间
+        /// </summary>
+        public DateTime ChangeTime { get; }
+
+        /// <summary>
+        /// 构造函数
+        /// </summary>
+        /// <param name="changeType">变更类型</param>
+        /// <param name="mqttServer">MQTT服务器DTO</param>
+        public MqttServerChangedEventArgs(DataChangeType changeType, MqttServerDto mqttServer)
+        {
+            ChangeType = changeType;
+            MqttServer = mqttServer;
+            ChangeTime = DateTime.Now;
+        }
+    }
+}