canvasManagement/Management.Web/Shared/Module/Assignment/RubricEditor.razor

@using Management.Web.Shared.Components

@inject CoursePlanner planner

@code
{
  [Parameter, EditorRequired]
  public IEnumerable<RubricItem> Rubric { get; set; } = default!;

  [Parameter, EditorRequired]
  public Action<IEnumerable<RubricItem>> SetRubric { get; set; } = default!;  

  private void addItem()
  {
    SetRubric(
      Rubric.Append(new RubricItem
      {
        Id=Guid.NewGuid().ToString(),
        Label="",
        Points=0
      })
    );
    StateHasChanged();
  }
  private void editItem(RubricItem newItem)
  {
    var newRubric = Rubric.Select(i => i.Id == newItem.Id ? newItem : i);
    SetRubric(newRubric);
    StateHasChanged();
  }
}

<br>
<h5>Rubric</h5>
<ul class="list-group">
  @foreach (var rubricItem in Rubric)
  {
    <RubricEditorItem RubricItem="rubricItem" OnUpdate="editItem" />
  }
</ul>

<button
  @onclick:preventDefault="true"
  @onclick="addItem"
  type="button"
  class="btn btn-outline-primary"
>
  + rubric item
</button>