CascadingValue is hopefully not null

ChildComponent.razor

@if (stuff)
{
  <div>Stuff</div>
}
else
{
  <div>More Stuff</div>
}

@code 
{
    [CascadingParameter]
    private WrapperComponent TheWrapper { get; set; }

    protected override void OnInitialized()
    {
        base.OnInitialized();
        // `TheWrapper` should not be null here
    }
}

MyPage.razor

@page "/mypage"

<WrapperComponent>
  <ChildComponent />
</WrapperComponent>

WrapperComponent.razor

@using Recyclarr.Radarr

<CascadingValue Value="this" IsFixed="true">
    <div>
        @if (some_error_occurred)
        {
            <div>Show an error</div>
        }
        else
        {
            @ChildContent
        }
    </div>
</CascadingValue>

@code {
    [Parameter]
    public RenderFragment ChildContent { get; set; }
}