添加了事件服务，并完成了设备状态改变后写入数据库

DMS.Application/Events/DeviceActiveChangedEventArgs.cs

@@ -0,0 +1,50 @@
+using System;
+
+namespace DMS.Application.Events;
+
+/// <summary>
+/// 设备状态改变事件参数
+/// </summary>
+public class DeviceActiveChangedEventArgs : EventArgs
+{
+    /// <summary>
+    /// 设备ID
+    /// </summary>
+    public int DeviceId { get; }
+
+    /// <summary>
+    /// 设备名称
+    /// </summary>
+    public string DeviceName { get; }
+
+    /// <summary>
+    /// 旧状态
+    /// </summary>
+    public bool OldStatus { get; }
+
+    /// <summary>
+    /// 新状态
+    /// </summary>
+    public bool NewStatus { get; }
+
+    /// <summary>
+    /// 状态改变时间
+    /// </summary>
+    public DateTime ChangeTime { get; }
+
+    /// <summary>
+    /// 初始化DeviceStatusChangedEventArgs类的新实例
+    /// </summary>
+    /// <param name="deviceId">设备ID</param>
+    /// <param name="deviceName">设备名称</param>
+    /// <param name="oldStatus">旧状态</param>
+    /// <param name="newStatus">新状态</param>
+    public DeviceActiveChangedEventArgs(int deviceId, string deviceName, bool oldStatus, bool newStatus)
+    {
+        DeviceId = deviceId;
+        DeviceName = deviceName;
+        OldStatus = oldStatus;
+        NewStatus = newStatus;
+        ChangeTime = DateTime.Now;
+    }
+}