Winform学习（五）--长时间操作加载提示，采用异步调用任务

学习链接：

a、https://www.cnblogs.com/txw1958/archive/2012/09/05/csharp-BackgroundWorker.html

b、https://www.cnblogs.com/zhaoshujie/p/9634136.html

1、定义异步任务

public partial class Form1 : Form
{
  private BackgroundWorker backgroundWorker = new BackgroundWorker();

  static loginTip loginTip = new loginTip();
}
public Form1()
{
  backgroundWorker.DoWork += new DoWorkEventHandler(backgroundWorker1_DoWork);
  backgroundWorker.WorkerSupportsCancellation = true;
}
//显示登陆提示
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
  loginTip.ShowDialog();//显示加载页面
}

2、调用

 if (!backgroundWorker.CancellationPending)
  {
      backgroundWorker.CancelAsync();
  }
  backgroundWorker.RunWorkerAsync();

3、关闭

this.Invoke(new Action(() =>
 {
    loginTip.Hide();
 }));
 backgroundWorker.CancelAsync();