Question

在我的UWP应用程序中，我显示ContentDialog只有TextBox，并根据用户输入执行一些操作。我想做的是这样的事情：

ContentDialogResult result = await LoginDialog.ShowAsync();
//Nothing else should be executed before the below method finishes executing
//other code
//....
//....
private void DialogPrimaryButton_ClickAsync(object sender, RoutedEventArgs e)
{
    SomethingSynchronous();
}

我是一个新手，无法理解异步 - 等待正确，发生的是行后面的代码

ContentDialogResult result = await LoginDialog.ShowAsync();

在用户点击对话框的主要或辅助按钮之前继续执行。我想在用户与对话框交互后继续前进。

Answer 1

方法1

private async void DialogPrimaryButton_ClickAsync(object sender, RoutedEventArgs e)
{
    await DisplayContentDialog();
}

private async Task DisplayContentDialog()
{
    ContentDialogResult result = await LoginDialog.ShowAsync();

    //For Primary, Secondary and Cancel Buttons inside the ContentDialog
    if (result == ContentDialogResult.Primary)
    {
        OutputText.Text = "Primary";
        // User Pressed Primary key
    }
    else if (result == ContentDialogResult.Secondary)
    {
        OutputText.Text = "Secondary";
        // User Pressed Secondary key
    }
    else
    {
        OutputText.Text = "Cancel";
        // User pressed Cancel, ESC, or the back arrow.
    }
}

//For custom Buttons inside the ContentDialog
//Use Button Click event for the custom Buttons inside the ContentDialog
private void XAMLButton_Click(object sender, RoutedEventArgs e)
{
    OutputText.Text = "XAML Button";
    LoginDialog.Hide();
}

方法2

private async void DialogPrimaryButton_ClickAsync(object sender, RoutedEventArgs e)
{
    await DisplayContentDialog();
}

private async Task DisplayContentDialog()
{
    XAMLButton.Click += XAMLButton_Click;
    LoginDialog.PrimaryButtonClick += LoginDialog_PrimaryButtonClick;
    LoginDialog.SecondaryButtonClick += LoginDialog_SecondaryButtonClick;
    LoginDialog.CloseButtonClick += LoginDialog_CloseButtonClick;
    await LoginDialog.ShowAsync();
}

//For Primary Button inside the ContentDialog
private void LoginDialog_PrimaryButtonClick(ContentDialog sender, ContentDialogButtonClickEventArgs args)
{
    OutputText.Text = "Primary";
}

//For Secondary Button inside the ContentDialog
private void LoginDialog_SecondaryButtonClick(ContentDialog sender, ContentDialogButtonClickEventArgs args)
{
    OutputText.Text = "Secondary";
}

//For Cancel Buttons inside the ContentDialog
private void LoginDialog_CloseButtonClick(ContentDialog sender, ContentDialogButtonClickEventArgs args)
{
    OutputText.Text = "Cancel";
}

//For custom Buttons inside the ContentDialog
private void XAMLButton_Click(object sender, RoutedEventArgs e)
{
    OutputText.Text = "XAML Button";
    LoginDialog.Hide();
}

了解来自Asynchronous programming和Call asynchronous APIs in C#文档

的async-await

UWP等待用户与ContentDialog的交互

1 个答案: