mapo-core/MP.Stats/Components/DataPager.razor

<div class="row">
    <div class="col-6 col-lg-10 text-left">
        <div class="row">
            <div class="col-9">
                paginazione
            </div>
            <div class="col-3">
                @totalCount records
            </div>
        </div>
    </div>
    <div class="col-6 col-lg-2 text-right">
        <div class="input-group input-group-sm">
            row/pag:&nbsp;
            <select @bind="@numRecord" class="form-control form-control-sm">
                <option value="5">5</option>
                <option value="10">10</option>
                <option value="25">25</option>
                <option value="50">50</option>
                <option value="100">100</option>
            </select>
        </div>
    </div>
</div>

@code {
    [Parameter]
    public int totalCount { get; set; } = 0;

    protected int _numRecord { get; set; } = 10;

    [Parameter]
    public int numRecord
    {
        get
        {
            return _numRecord;
        }
        set
        {
            bool doReport = !_numRecord.Equals(value);
            _numRecord = value;
            if (doReport)
            {
                reportChange();
            }
        }
    }

    [Parameter]
    public EventCallback<int> numRecordChanged { get; set; }

    private void reportChange()
    {
        numRecordChanged.InvokeAsync(numRecord);
    }

}