UWP C++ ContentDialog PrimaryButtonCommand 或 PrimaryButtonClick

Question

我正在尝试在 UWP C++ 应用程序中使用 ContentDialog^。随着 MessageDialog^ 您可以轻松设置触摸时调用的按钮和命令 Windows::UI::Popups::UICommand

MessageDialog^ msg = ref new MessageDialog("Data changed - Save?");
msg->Title = "Warning";

// Add commands and set their callbacks.
UICommand^ continueCommand = ref new UICommand("Yes", ref new UICommandInvokedHandler(this, &MainPage::CommandInvokedHandler));
UICommand^ upgradeCommand = ref new UICommand("No", ref new UICommandInvokedHandler(this, &MainPage::CommandInvokedHandler));
UICommand^ cancelCommand = ref new UICommand("Cancel", ref new UICommandInvokedHandler(this, &MainPage::CommandInvokedHandler));

然后您可以轻松访问

发送到CommandInvokedHandler的值

void MainPage::CommandInvokedHandler(Windows::UI::Popups::IUICommand^ command)
{
    // Display message
    if (command->Label == "Yes") {
        Save();
    } else if (command->Label == "No") {
        Skip();
    } else if (command->Label == "Cancel") {
        //do nothing
    }
}

但是，内容对话框的工作方式完全不同。它是这样创建的

TextBox^ inputTextBox = ref new TextBox();
inputTextBox->AcceptsReturn = false;
inputTextBox->Height = 32;
ContentDialog^ dialog = ref new ContentDialog();

dialog->Content = inputTextBox;
dialog->Title = "Rename";
dialog->IsSecondaryButtonEnabled = true;
dialog->PrimaryButtonText = "Ok";
dialog->SecondaryButtonText = "Cancel";
dialog->ShowAsync();

我要么需要设置属性 dialog->PrimaryButtonCommand 出于某些（未知的奇怪）原因使用完全不同的 Windows::UI::Xaml::Input::ICommand...
或者我应该使用 dialog->PrimaryButtonClick？

我很难在任何地方找到任何 C++ 示例，而且文档没有清除任何内容。

Answer 1

你可以用PrimaryButtonCommand or PrimaryButtonClick in ContentDialog. Both of them will be invoked when the primary button has been tapped. The difference between them is that PrimaryButtonClick is a event, but PrimaryButtonCommand is a property whose type is ICommand. Please note ICommand is not the same as UICommand用在MessageDialog，它们完全是两个不同的东西。

ICommand is more used with XAML Binding. To use it, we will implement ICommand interface and then use in view model. For more info, please refer to Executing commands in a view model.

在您的情况下，当您在代码隐藏中创建内容对话框时，我认为您可以使用如下事件处理程序方法订阅 PrimaryButtonClick 事件：

void MainPage::Button_Click(Platform::Object^ sender, Windows::UI::Xaml::RoutedEventArgs^ e)
{
    TextBox^ inputTextBox = ref new TextBox();
    inputTextBox->AcceptsReturn = false;
    inputTextBox->Height = 32;
    ContentDialog^ dialog = ref new ContentDialog();

    dialog->Content = inputTextBox;
    dialog->Title = "Rename";
    dialog->IsSecondaryButtonEnabled = true;
    dialog->PrimaryButtonText = "Ok";
    dialog->SecondaryButtonText = "Cancel";
    dialog->PrimaryButtonClick += ref new Windows::Foundation::TypedEventHandler<Windows::UI::Xaml::Controls::ContentDialog ^, Windows::UI::Xaml::Controls::ContentDialogButtonClickEventArgs ^>(this, &MainPage::OnPrimaryButtonClick);
    dialog->ShowAsync();
}


void MainPage::OnPrimaryButtonClick(Windows::UI::Xaml::Controls::ContentDialog ^sender, Windows::UI::Xaml::Controls::ContentDialogButtonClickEventArgs ^args)
{
    // Do something useful here
}

UWP C++ ContentDialog PrimaryButtonCommand 或 PrimaryButtonClick

UWP C++ ContentDialog PrimaryButtonCommand or PrimaryButtonClick

c++-cx

uwp