EddyHaigh

        <FluentDialog aria-label="Dialog" Modal="true" hidden="@(!ShowDialog)">
            <div>
                <FluentButton Appearance="Appearance.Neutral" @onclick="() => ShowDialog = false">ToggleDialog</FluentButton>
            </div>
        </FluentDialog>
<FluentButton Appearance="Appearance.Neutral" @onclick="() => ShowDialog = true">Toggle Dialog</FluentButton>

@code {
  public bool ShowDialog { get; set; }
}

EddyHaigh

using System;
public class C {    
    public int PageIndex { get; }
    
    public C(int pageIndex = 1){
        
        PageIndex = pageIndex;
    }
}