【WPF】实现加载中动画效果

参考自：

https://blog.csdn.net/zhumingyan/article/details/50294905

后台代码：

BackgroundWorker bgMeet;

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            bgMeet = new BackgroundWorker();
            //能否报告进度更新
            bgMeet.WorkerReportsProgress = true;
            //要执行的后台任务
            bgMeet.DoWork += new DoWorkEventHandler(bgMeet_DoWork);
            //进度报告方法
            bgMeet.ProgressChanged += new ProgressChangedEventHandler(bgMeet_ProgressChanged);
            //后台任务执行完成时调用的方法
            bgMeet.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bgMeet_RunWorkerCompleted);
            bgMeet.RunWorkerAsync(); //任务启动
        }
        //执行任务
        void bgMeet_DoWork(object sender, DoWorkEventArgs e)
        {
            //开始播放等待动画
            this.Dispatcher.Invoke(new Action(() =>
            {
                loading.Visibility = System.Windows.Visibility.Visible;
            }));
            //开始后台任务
            GetData();
        }
        //报告任务进度
        void bgMeet_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            this.Dispatcher.Invoke(new Action(() =>
            {
                this.lab_pro.Content = e.ProgressPercentage + "%";
            }));
        }
        //任务执行完成后更新状态
        void bgMeet_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            loading.Visibility = System.Windows.Visibility.Collapsed;
            this.Dispatcher.Invoke(new Action(() =>
            {
                this.lab_pro.Content = "完成";
            }));
        }
        //模拟耗时任务
        public void GetData()
        {
            for (int i = 0; i < 6; i++)
            {
                bgMeet.ReportProgress(20 * i);
                System.Threading.Thread.Sleep(400);
            }
        }

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