MovieForm.razor

<EditForm Model="Movie" OnValidSubmit="OnValidSubmit">
    <div class="form-group">
        <label>Genres:</label>
        <div>
            <MultipleSelector Selected="Selected" NoSelected="NotSelected"></MultipleSelector>
        </div>
    </div>
</EditForm>

@code {
    [Parameter] public List<Genre> SelectedGenres { get; set; } = new List<Genre>();
    [Parameter] public List<Genre> NotSelectedGenres { get; set; } = new List<Genre>();
   
    private List<MultipleSelectorModel> Selected = new List<MultipleSelectorModel>();
    private List<MultipleSelectorModel> NotSelected = new List<MultipleSelectorModel>();

    protected override void OnInitialized()
    {
        Selected = SelectedGenres.Select(x => new MultipleSelectorModel(x.Id.ToString(), x.Name)).ToList();
        NotSelected = NotSelectedGenres.Select(x => new MultipleSelectorModel(x.Id.ToString(), x.Name)).ToList();       
    }
}