我无法让这个BackgroundWorker为我工作。我正在使用here
中的 m3rLinEz 示例问题是GUI没有响应,百分比没有更新。
我正在使用母版页,我在内容页面的标题中设置了async="true"
我错过了别的什么吗?
ASPX代码:
<asp:Button ID="btnGo" runat="server" Text="Go" OnClick="btnClick_Go" />
<asp:Label runat="server" id="textUpdate" text="0%" />
背后的代码
protected void btnClick_Go(object sender, EventArgs e)
{
BackgroundWorker bw = new BackgroundWorker();
// this allows our worker to report progress during work
bw.WorkerReportsProgress = true;
// what to do in the background thread
bw.DoWork += new DoWorkEventHandler(
delegate(object o, DoWorkEventArgs args)
{
BackgroundWorker b = o as BackgroundWorker;
// do some simple processing for 10 seconds
for (int i = 1; i <= 10; i++)
{
// report the progress in percent
b.ReportProgress(i * 10);
Thread.Sleep(1000);
}
});
// what to do when progress changed (update the progress bar for example)
bw.ProgressChanged += new ProgressChangedEventHandler(
delegate(object o, ProgressChangedEventArgs args)
{
textUpdate.Text = string.Format("{0}%", args.ProgressPercentage);
});
// what to do when worker completes its task (notify the user)
bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(
delegate(object o, RunWorkerCompletedEventArgs args)
{
lblSuccess.Visible = true;
});
bw.RunWorkerAsync();
}
答案 0 :(得分:2)
BackgroundWorker
通常用于客户端UI - WPF,WinForms等。
在您的代码中,您尝试在将响应发送回客户端后更新UI 。如果没有客户端到服务器的后续请求,您希望如何工作?
说到Web应用程序,您需要使用AJAX来不断更新UI。可能有很好的方法可以让AJAX易于管理,但你不能只在服务器端使用BackgroundWorker
并希望它一切正常。