C# UI update thread backgroundWorker

運算要放在UI thread之外，才不會卡到UI呈現
這裡介紹用backgroundWorker的方式

step1.

using System.ComponentModel.BackgroundWorker;

step2.

BackgroundWorker backgroundWorker = new BackgroundWorker();

backgroundWorker.DoWork += backgroundWorker_DoWork;
backgroundWorker.ProgressChanged += backgroundWorker_ProgressChanged;
backgroundWorker.RunWorkerCompleted += backgroundWorker_RunWorkerCompleted;

step3.


        public void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
        {
            //在此放你要的運算
            String xxx=運算的結果();
            //呼叫UI狀態的改變
            backgroundWorker.ReportProgress(0, xxx);
        }
        private void backgroundWorker_ProgressChanged(object sender,ProgressChangedEventArgs e)
        {
            //UI的改變放在這
            msg.Text += e.UserState.ToString();
            msg.ScrollToEnd();
        }
        void backgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            //全部做完時
            msg.Text += "\ncompleted ";
            msg.ScrollToEnd();
        }



step4.

        private void button2_Click(object sender, RoutedEventArgs e){
            msg.Text = "start analysis....\n";
            //啟動backgroundworker
            backgroundWorker.WorkerReportsProgress = true;
            backgroundWorker.RunWorkerAsync();        
        }