Application state for the current-running instance of the application can be saved and shared between Components.

Create some class to store state:

public class ApplicationState
    // create a property/field for each piece of data to be stored
    public int NumberOfMessages { get; set; } = 0;

Add the instance to DI:


Inject it and use it:

public ApplicationState? ApplicationState { get; set; }

int a = ApplicationState.NumberOfMessages;