每当我访问访问网格的视图时，如何刷新网格？

Question

我的Vaadin项目中有一个网格，它显示了我的Events Repository中所有事件实体的部分。显示该网格的观点显示了事件实体很好，但只有进入存储库后才处于第一个状态。每当用户签署一个事件时，其“参与者”计数应该会删除，并且应该将其名称添加到用户列表中（目前只是一个大字符串）。但是，每当我回到此视图时，网格都不会更新。我知道我需要调用gred.getDatapRovider（）。refreshall（）;在我的代码中的某个地方以获取这些更新的网格，但我只是无法弄清楚在哪里说明它。我已经确认我正在正确地改变这些价值，但是这些变化并没有反映在网格中。

这是我的观点，可以访问我提到的网格：

import com.vaadin.flow.component.grid.Grid;
import com.vaadin.flow.component.grid.GridVariant;
import com.vaadin.flow.component.html.Div;
import com.vaadin.flow.component.html.Span;
import com.vaadin.flow.component.orderedlayout.HorizontalLayout;
import com.vaadin.flow.component.orderedlayout.VerticalLayout;
import com.vaadin.flow.router.AfterNavigationEvent;
import com.vaadin.flow.router.AfterNavigationListener;
import com.vaadin.flow.router.PageTitle;
import com.vaadin.flow.router.Route;
import ymca.tracker.application.data.entity.Events;
import ymca.tracker.application.data.service.EventsService;

import java.util.List;

@PageTitle("Registration Management")
@Route(value = "registration-management")
public class RegistrationManagementView extends Div implements AfterNavigationListener {

    EventsService eventsService;
    Grid<Events> grid = new Grid<>();

    public RegistrationManagementView(EventsService eventsService) {
        this.eventsService = eventsService;
        addClassName("account-view");
        setSizeFull();
        grid.setHeight("100%");
        grid.addThemeVariants(GridVariant.LUMO_NO_BORDER, GridVariant.LUMO_NO_ROW_BORDERS);
        List<Events> events = getData();
        grid.setItems(events);
        grid.addComponentColumn(event -> createCard(event));
        add(grid);
        // I tried calling this line of code in the constructor, but this does not refresh either
        grid.getDataProvider().refreshAll();
    }

    private HorizontalLayout createCard(Events events) {
        HorizontalLayout card = new HorizontalLayout();
        card.addClassName("card");
        card.setSpacing(false);
        card.getThemeList().add("spacing-s");

        VerticalLayout vl = new VerticalLayout();
        vl.addClassName("description");
        vl.setSpacing(false);
        vl.setPadding(false);

        HorizontalLayout header = new HorizontalLayout();
        header.addClassName("header");
        header.setSpacing(false);
        header.getThemeList().add("spacing-s");

        Span name = new Span(events.getName());
        name.addClassName("name");

        header.add(name);

        Span capacity = new Span("Spots Remaining: " + events.getParticipants());
        capacity.addClassName("capacity");
        
        String registrantList = events.getUsers();

        Span signUps = new Span("Current Registrants: \n" + registrantList);
        signUps.addClassName("signUps");

        vl.add(header, capacity, signUps);
        card.add(vl);
        return card;
    }

    public List<Events> getData() {
        List<Events> events = eventsService.findAllEvents();
        return events;
    }

    /* I tried an aferNavigationListener, but I really don't know how 
        to implement this at all but I know this is not correct
    */
    @Override
    public void afterNavigation(AfterNavigationEvent afterNavigationEvent) {
        grid.getDataProvider().refreshAll();
    }
}