BackgroundWorker实现的winfrom中实现异步等待加载图片显示

BackgroundWorker简介

BackgroundWorker在winfrom中有对应控件，该有三个事件：DoWork 、ProgressChanged 和 RunWorkerCompleted。

在程序中调用RunWorkerAsync方法则会启动DoWork事件的事件处理，当在事件处理过程中，调用 ReportProgress方法则会启动ProgressChanged事件的事件处理，而当DoWork事件处理完成时，则会触发RunWorkerCompleted事件。您必须非常小心，确保在 DoWork 事件处理程序中不操作任何用户界面对象（否则仍会停止响应）。而应该通过 ProgressChanged和 RunWorkerCompleted 事件与用户界面进行通信。

实现waitefrom界面的窗体，改界面自己设计。

protected virtual void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker bw = sender as BackgroundWorker;
for (int i = 0; i < 100; i++)
{
System.Threading.Thread.Sleep(1000);
WaiteForm1 f = e.Argument as WaiteForm1;
f.bw.ReportProgress(i);
bw.ReportProgress(i);
}
object a = e.Argument;
object b = e.Cancel;
e.Result = "21";
}

private void button1_Click(object sender, EventArgs e)
{
WaiteForm1 wa = new WaiteForm1();

//执行DoWork事件可传入执行的参数
wa.bw.RunWorkerAsync(wa);

wa.bw.DoWork += new DoWorkEventHandler(backgroundWorker1_DoWork);
//wa.bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backgroundWorker1_RunWorkerCompleted);
wa.ShowDialog(this);
this.Text = "2132";
}

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