WPF实现定时刷新UI界面的实例详解

本文实例为大家分享了WPF定时刷新UI界面展示的具体代码，供大家参考，具体内容如下

代码：

using NHibernate.Criterion;  using System;  using System.Collections.Generic;  using System.Collections.ObjectModel;  using System.ComponentModel;  using System.Data;  using System.Linq;  using System.Text;  using System.Threading;  using System.Windows;  using System.Windows.Controls;  using System.Windows.Data;  using System.Windows.Documents;  using System.Windows.Input;  using System.Windows.Media;  using System.Windows.Media.Imaging;  using System.Windows.Navigation;  using System.Windows.Shapes;  using Visifire.Charts;    namespace SunCreate.CombatPlatform.Client  {    public partial class MainPage : UserControl    {      private System.Timers.Timer timerNotice = null;        public MainPage()      {        InitializeComponent();      }        private void MainPage_Loaded(object sender, RoutedEventArgs e)      {        #region 通知公告        if (timerNotice == null)        {          BindNotice();            timerNotice = new System.Timers.Timer();          timerNotice.Elapsed += new System.Timers.ElapsedEventHandler((o, eea) =>          {            BindNotice();          });          timerNotice.Interval = 60 * 1000;          timerNotice.Start();        }        #endregion      }        private void MainPage_SizeChanged(object sender, SizeChangedEventArgs e)      {        }        #region 绑定通知公告      private void BindNotice()      {        System.Threading.Tasks.Task.Factory.StartNew(() =>        {          try          {            int total = 0;            TES_NOTICE info = new TES_NOTICE();            IList<TES_NOTICE> list = new List<TES_NOTICE>();              list = HI.Get<INoticeService>().GetListPage(null, DateTime.MinValue, DateTime.MinValue, 1, 50, ref total);              Dispatcher.Invoke(new Action(() =>            {              noticeListView.ItemsSource = list;            }));          }          catch          {            }        });      }      #endregion      }  }

说明：在 System.Timers.Timer 的事件中使用 BackgroundWorker 是无效的，即如下代码不能正常刷新界面：

using NHibernate.Criterion;  using System;  using System.Collections.Generic;  using System.Collections.ObjectModel;  using System.ComponentModel;  using System.Data;  using System.Linq;  using System.Text;  using System.Threading;  using System.Windows;  using System.Windows.Controls;  using System.Windows.Data;  using System.Windows.Documents;  using System.Windows.Input;  using System.Windows.Media;  using System.Windows.Media.Imaging;  using System.Windows.Navigation;  using System.Windows.Shapes;  using Visifire.Charts;    namespace SunCreate.CombatPlatform.Client  {    public partial class MainPage : UserControl    {      private System.Timers.Timer timerNotice = null;        public MainPage()      {        InitializeComponent();      }        private void MainPage_Loaded(object sender, RoutedEventArgs e)      {        #region 通知公告        if (timerNotice == null)        {          BindNotice();            timerNotice = new System.Timers.Timer();          timerNotice.Elapsed += new System.Timers.ElapsedEventHandler((o, eea) =>          {            BindNotice();          });          timerNotice.Interval = 60 * 1000;          timerNotice.Start();        }        #endregion      }        private void MainPage_SizeChanged(object sender, SizeChangedEventArgs e)      {        }        #region 绑定通知公告      private void BindNotice()      {        PT_USER_INFO user = new PT_USER_INFO();        IList<TES_COMBAT_TASK> taskList = new List<TES_COMBAT_TASK>();          BackgroundWorker worker = new BackgroundWorker();        worker.DoWork += (s, e) =>        {          user = HI.Get<Cache.ICacheService>().UserCache.GetCurrentUserInfo();          taskList = HI.Get<ITaskService>().GetCombatTaskByUserIDUnfinished(user.ID.ToString());          };        worker.RunWorkerCompleted += (s, e) =>        {          try          {            taskListView.ItemsSource = taskList;          }          catch { }        };        worker.RunWorkerAsync();      }      #endregion      }  }

也可以使用 DispatcherTimer 刷新界面，但耗时的操作不能放在DispatcherTimer的事件中执行，否则界面会卡，那么耗时的定时操作，比如查询数据库，需要再用一个 System.Timers.Timer，相对比较麻烦。

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