@page "/"
<div class="border border-success rounded p-2 m-2">
<b>Index</b>
<div>
<span>Selected page: @_selectedPage</span>
<button
type="button"
class="btn btn-success ml-2 px-1 py-0"
@onclick="() => _selectedPage++">+</button>
</div>
<div>
<span>Selected page element: @_selectedPageElement</span>
<button
type="button"
class="btn btn-success ml-2 px-1 py-0"
@onclick="() => _selectedPageElement++">+</button>
</div>
<Foo SelectedPage="_selectedPage" SelectedPageElement="_selectedPageElement" />
</div>
@code {
private int _selectedPage;
private int _selectedPageElement;
}