WPF線程(Step2)——BackgroundWorker

在WPF中第二個常用的線程處理方式就是BackgroundWorker。

以下是BackgroundWorker一個簡單的例子。

public partial class MainWindow : Window
    {
        /// <summary>
        /// 后台worker
        /// </summary>
        BackgroundWorker worker = new BackgroundWorker();

        public MainWindow()
        {
            InitializeComponent();
            worker.WorkerReportsProgress = true;
            worker.DoWork += new DoWorkEventHandler(worker_DoWork);
            worker.ProgressChanged += worker_ProgressChanged;
            this.btn_test.Click += btn_test_Click;
        }

        /// <summary>
        /// 按鈕點擊
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void btn_test_Click(object sender, RoutedEventArgs e)
        {
            worker.RunWorkerAsync();
        }

        /// <summary>
        /// 進度返回處理
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            this.pb_test.Value = e.ProgressPercentage;
        }

        /// <summary>
        /// 業務邏輯處理
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void worker_DoWork(object sender, DoWorkEventArgs e)
        {
            for (int i = 0; i <= 100; i++)
            {
                worker.ReportProgress(i);//返回進度
                Thread.Sleep(100);
            }
        }
    }

其中要注意的有BackgroundWorker的屬性WorkerReportsProgress表示BackgroundWorker是否可以返回進度。事件DoWork中處理自身的業務邏輯，ProgressChanged負責更新界面操作。

 

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