CloudMusic/FNZCM/FNZCM.BlazorWasm/UI/Views/Browse/LibSelector.razor

<Select2 class="flex-fill" TItem="FeLibrary"
         TSource="FeLibrary[]"
         IdSelector="c => c.Key"
         TextSelector="@(c =>c.Name+" ("+c.Discs.Length+")")"
         FilterFunction="FilterLibrary"
         GetElementById="async (items, id, token) => items.FirstOrDefault(q=>q.Key==id)"
         Datasource="FnzDataSet.AllLibrary.OrderBy(p=>p.Key).ToArray()"
         Value="@SelectedLibs"
         Multiselect="false"
         OnValueChanged="OnValueChanged" />

@code {

    [Parameter, Required]
    public List<FeLibrary> SelectedLibs { get; set; } = new();

    [Parameter] public EventCallback OnValueChanged { get; set; } = EventCallback.Empty;

    private async Task<List<FeLibrary>> FilterLibrary(IReadOnlyCollection<FeLibrary> source, string input, CancellationToken ct)
    {
        var result = new List<FeLibrary>();

        foreach (var item in source.Where(p => p.Name.StartsWith(input, StringComparison.OrdinalIgnoreCase))) result.Add(item);
        foreach (var item in source.Where(p => !p.Name.StartsWith(input, StringComparison.OrdinalIgnoreCase) && p.Name.Contains(input, StringComparison.OrdinalIgnoreCase))) result.Add(item);

        return result;
    }

}