优化部分代码,尝试修复热键回调多次bug

Task/ToDoTask.cs

@@ -0,0 +1,57 @@
+using GeekDesk.Control;
+using GeekDesk.Control.Other;
+using GeekDesk.ViewModel;
+using HandyControl.Controls;
+using HandyControl.Data;
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Timers;
+
+namespace GeekDesk.Task
+{
+    public class ToDoTask
+    {
+
+        ///public static ObservableCollection<ToDoInfo> activityBacklog = new ObservableCollection<ToDoInfo>();
+
+        public static Dictionary<ToDoInfo, Notification> activityBacklog = new Dictionary<ToDoInfo, Notification>();
+
+        public static void BackLogCheck()
+        {
+
+            System.Timers.Timer timer = new System.Timers.Timer();
+            timer.Enabled = true;
+            timer.Interval = 5000;
+            timer.Start();
+            timer.Elapsed += new System.Timers.ElapsedEventHandler(Check);
+        }
+
+
+        private static void Check(object source, ElapsedEventArgs e)
+        {
+            App.Current.Dispatcher.Invoke((Action)(() =>
+            {
+                if (MainWindow.appData.ToDoList.Count > 0)
+                {
+                    string nowTime = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
+                    ObservableCollection<ToDoInfo> exeBacklogList = MainWindow.appData.ToDoList;
+                    foreach (ToDoInfo info in exeBacklogList)
+                    {
+                        if (info.ExeTime.CompareTo(nowTime) == -1 && !activityBacklog.ContainsKey(info))
+                        {
+                            activityBacklog.Add(info, Notification.Show(new BacklogNotificatin(info), ShowAnimation.Fade, true));
+                        }
+                    }
+                }
+            }));
+        }
+
+
+
+    }
+}