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對不起,我是一個新手,當談到WPF:WPF標籤內容顯示在執行
當我點擊一個按鈕,我想看看在標籤中顯示的一個消息功能啓動時,和那麼我想看到的功能完成時另一條消息顯示。
在這裏的代碼,我只看到單擊該按鈕時,顯示的最後一條消息的價值。可有人向我解釋爲什麼?
由於這不起作用,我將如何去完成我真正想要的功能 - 查看一段時間內的消息(如「處理」),然後在函數完成時看到另一條消息(如「完成」) ?
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void Button_Click(object sender, RoutedEventArgs e)
{
MessageLabel.Content = "I never see this";
System.Threading.Thread.Sleep(2000);
MessageLabel.Content = "I only see this";
}
}
謝謝Blachshma!下面是代碼,做什麼,我想用BackgroundWorker的對象。
public partial class MainWindow : Window
{
private BackgroundWorker backgroundWorker1 = new BackgroundWorker();
public MainWindow()
{
InitializeComponent();
backgroundWorker1.WorkerReportsProgress = true;
backgroundWorker1.WorkerSupportsCancellation = false;
backgroundWorker1.DoWork += worker_DoWork;
backgroundWorker1.RunWorkerCompleted += worker_RunWorkerCompleted;
}
private void Button_Click(object sender, RoutedEventArgs e)
{
MessageLabel.Content = "I see this now";
if (backgroundWorker1.IsBusy != true)
{
backgroundWorker1.RunWorkerAsync();
}
}
private void worker_DoWork(object sender, DoWorkEventArgs e)
{
System.Threading.Thread.Sleep(2000);
}
private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
MessageLabel.Content = "and I see this too";
}
}
謝謝!這裏是工作的代碼: – Dudeman3000 2013-03-26 00:05:21