UWP Inherit parent page from child page

Question

Hello I am a student who has just started studying UWP

A structure is a structure that has frames within a page and moves through navigation.

I want to create a button that is retrieved from a page belonging to a frame in the parent page and then override it so that the logic works when pressed in the lower page

ShellViewModel

public ShellViewModel()  
        {  
            Action_Search_Command = new DelegateCommand(Action_Search);  
        }  
  
        protected virtual void Action_Search()  
        {  
             
        }  

OM_01ViewModel

protected override void Action_Search()  
        {  
  
            base.Action_Search();  
  
            Set_Grid();  
        }  

I created a lookup button and command in the shell page and overridden it in the page corresponding to the frame to call the function to bind the datagrid, but it didn't work.

Answer 1

Hello,
Welcome to Microsoft Q&A!

Your problem is more related with C# polymorphism. If you want to ShellViewModel could call the sub-class override method, you should use father reference point to sub-class instance.

ShellPage

public MainPage()  
{  
    this.InitializeComponent();  
    Instance = this;  
    this.DataContext = new OM_01ViewModel() as ShellViewModel;  
    
}  
public static MainPage Instance;  

SubPage

public CorePage()  
{  
    this.InitializeComponent();  
  
    this.DataContext = MainPage.Instance.DataContext as OM_01ViewModel;  
}  

Thank you.

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