修复S7服务轮询问题

DMS.Application/Events/VariableValueChangedEventArgs.cs

@@ -1,50 +0,0 @@
-using System;
-
-namespace DMS.Application.Events;
-
-/// <summary>
-/// 变量值改变事件参数
-/// </summary>
-public class VariableValueChangedEventArgs : EventArgs
-{
-    /// <summary>
-    /// 变量ID
-    /// </summary>
-    public int VariableId { get; }
-
-    /// <summary>
-    /// 变量名称
-    /// </summary>
-    public string VariableName { get; }
-
-    /// <summary>
-    /// 旧值
-    /// </summary>
-    public string OldValue { get; }
-
-    /// <summary>
-    /// 新值
-    /// </summary>
-    public string NewValue { get; }
-
-    /// <summary>
-    /// 值改变时间
-    /// </summary>
-    public DateTime ChangeTime { get; }
-
-    /// <summary>
-    /// 初始化VariableValueChangedEventArgs类的新实例
-    /// </summary>
-    /// <param name="variableId">变量ID</param>
-    /// <param name="variableName">变量名称</param>
-    /// <param name="oldValue">旧值</param>
-    /// <param name="newValue">新值</param>
-    public VariableValueChangedEventArgs(int variableId, string variableName, string oldValue, string newValue)
-    {
-        VariableId = variableId;
-        VariableName = variableName;
-        OldValue = oldValue;
-        NewValue = newValue;
-        ChangeTime = DateTime.Now;
-    }
-}