xamarin.forms - 系统无效操作异常: Page must not already have a parent

Question

在我的 Xamarin.Forms 应用程序中，我有以下代码:

while (this.Navigation.ModalStack.Count > 0)
{
    await this.Navigation.PopModalAsync();
}

await Navigation.PushModalAsync(App.MyMasterDetailPage.Value);

在最后一行，我收到错误

System.InvalidOperationException: Page must not already have a parent.

当我已经从 ModalStack 中弹出所有内容时，MyMasterDetailPage 怎么可能有父级？我只将它推送到 ModalStack

Answer 1

A MasterDetailPage is designed to be a root page, and using it as a child page in other page types could result in unexpected and inconsistent behavior. In addition, it's recommended that the master page of a MasterDetailPage should always be a ContentPage instance, and that the detail page should only be populated with TabbedPage, NavigationPage, and ContentPage instances. This will help to ensure a consistent user experience across all platforms.

来源:official documentation