Question

我给用户一个页面来编辑列表视图项目＆＃39;内容。

$_POST

这是将用户带到那里的上下文操作。因此，在将用户发送到另一个页面后，我想等到他在编辑页面上完成编辑，然后返回完成该功能。

我打算以不同的方式做这件事，但事实并非我想要的方式。我需要public async void OnEdit(object sender, EventArgs e) { var menuItem = ((MenuItem)sender); if (menuItem != null) { var selectedZone = (ViewModels.ZoneViewModel)menuItem.CommandParameter; // Send to edit page with selectedzones' contents. await Navigation.PushAsync(new ZonePage(selectedZone.Name, selectedZone.Address, selectedZone.IdentitySource, selectedZone.Username, selectedZone.Password)); //Wait until user returns from page //Edit logic here } }从列表中获取所选项目，并且不知道在我的情况下使其工作的另一种方法。

这可能吗？

Answer 1

You can try MessagingCenter to communicate between two pages. 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.

To pass an argument with the message, specify the argument Type in the Subscribe generic arguments and in the Action signature.

    MessagingCenter.Subscribe<MainPage, string> (this, "Hi", (sender, arg) => {
    // do something whenever the "Hi" message is sent
    // using the 'arg' parameter which is a string
});

To send the message with argument, include the Type generic parameter and the value of the argument in the Send method call.

MessagingCenter.Send<MainPage, string> (this, "Hi", "John");

Here is the more detailed official documentation with examples.

是否可以转到另一个页面，等到用户返回原始页面，然后继续该功能？

1 个答案: