Question

当我点击登录按钮时，我的后台工作人员开始处理并显示一个加载对话框窗口。

但是，我的任务完成后如何关闭它？

private void LoginButton_Click(object sender, RoutedEventArgs e)
{
    AdjustControls(false);
    if (Username == null)
    {
        Error("Username required");
        return;
    }
    loading.ShowDialog();
    backgroundWorker = new BackgroundWorker();
    backgroundWorker.DoWork += login_backgroundWorker_DoWork;
    backgroundWorker.ProgressChanged += login_backgroundWorker_ProgressChanged;
    backgroundWorker.RunWorkerCompleted += login_backgroundWorker_RunWorkerCompleted;
    backgroundWorker.WorkerReportsProgress = true;
    backgroundWorker.RunWorkerAsync();

}

private void login_backgroundWorker_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
{
    var backgroundWorker = sender as BackgroundWorker;
    try
    {
        this.Dispatcher.Invoke(new MethodInvoker(delegate ()
        {
            loading.ShowDialog();
            Action closeAction = () => loading.Close();
            loading.Dispatcher.Invoke(closeAction);
            this.Close();
        }));
    }
    catch (Exception InputChangedException)
    {
        Console.WriteLine(InputChangedException);
        if (InputChangedException != null)
        {
            Error(InputChangedException.Message);
        }
    }

}

private void login_backgroundWorker_ProgressChanged(object sender, System.ComponentModel.ProgressChangedEventArgs e)
{

}

private void login_backgroundWorker_RunWorkerCompleted(object sender, System.ComponentModel.RunWorkerCompletedEventArgs e)
{
    this.Dispatcher.Invoke(new MethodInvoker(delegate ()
    {
        loading.Close();
    }));
}

Answer 1

我找到了答案，看起来很简单。我只需要设置一个操作：

this.Dispatcher.BeginInvoke(new Action(() => loading.ShowDialog()));

这是启动它，然后再关闭它

WPF 在后台工作完成后自动关闭对话框

1 个答案: