BackgroundWorker使用方法

//异步执行，避免界面卡死， BackgroundWorker对象
private BackgroundWorker bw = new BackgroundWorker();

bw.WorkerReportsProgress = true;
//bw.WorkerSupportsCancellation = true;
bw.DoWork += new DoWorkEventHandler(bw_DoWork);
bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bw_RunWorkerCompleted);

//执行长时间方法
private void btnLongtime_Click(object sender, EventArgs e)
{
    if (bw.IsBusy != true)
    {
        bw.RunWorkerAsync();
    }
}

/// <summary>
/// BackgroundWorker执行的长时间方法
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void bw_DoWork(object sender, DoWorkEventArgs e)
{
    for(int i = 0; i < 999999999; i++)
    {
    
    }

}

/// <summary>
/// 事件执行完成的回调方法
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    MessageBox.Show("执行完毕", "对话框");
    
}