c# - 如何以Xamarin形式从CustomViewCell调用任何Navigation.PushPopupAsync？

Question

我有一个ListView，并且有CustomViewCell。 CustomViewCell的按钮很少。

按钮:ShowProfile:此按钮弹出另一页。问题是我不知道如何在Navigation.PushPopupAsync中使用CustomViewCell。我还需要在其中传递当前的CustomViewCell详细信息。

这是我如何在另一个页面中使用Navigation.PushPopupAsync的示例，该页面工作正常，但在CustomViewCell情况下不起作用。

Navigation.PushPopupAsync(new UserProfilePage(new ExtendedProfile(_viewModel.Profile)));

但是以上代码在CustomViewCell中不起作用。

public partial class ProfileListItemViewCell : CustomViewCell
{
    public ProfileListItemViewCell()
    {
        InitializeComponent();
    }

    protected override void OnBindingContextChanged ()
    {
        base.OnBindingContextChanged ();
    }
    private void MenuItemProfile_Clicked(object sender, System.EventArgs e)
    {
        //not working
        Navigation.PushPopupAsync(new UserProfilePage(new ExtendedProfile(_viewModel.Profile)));
    }
}

Answer 1

这看起来像MessagingCenter的工作

Xamarin.Forms MessagingCenter enables view models and other components to communicate with without having to know anything about each other besides a simple Message contract.

在页面构造器中

MessagingCenter.Subscribe<SomeObject> (this, "MyAwesomeShowWindowMessage", 
(someObject) =>
{
     Navigation.PushPopupAsync(new UserProfilePage(new ExtendedProfile(someObject)));
});

来自您的单元格

 MessagingCenter.Send(SomeObject, "MyAwesomeShowWindowMessage");

当您退出听力页面时，别忘了退订

 MessagingCenter.Unsubscribe<SomeObject> (this, "MyAwesomeShowWindowMessage"));

其他示例

How to use Xamarin.Forms Messaging Center