@if (Errors.Count == 0)
{
  @ChildContent
}
else
{
  <p>The following error@(Errors.Count == 1 ? "" : "s") occurred:</p>
  <ul>
    @foreach (var msg in Errors)
    {
      <li><pre>@msg</pre></li>
    }
  </ul>
}

@code {
    [Parameter]
    public IList<string> Errors { get; set; } = default!;

    [Parameter]
    public RenderFragment ChildContent { get; set; } = default!;
}