/// <summary>
/// 变更分页的总记录数，并触发 <see cref="TotalCountChanged"/> 事件。
/// </summary>
/// <param name="count">要变更的总记录数。</param>
public async Task ChangeTotalCount(int count)
{
await NavigateToFirst();
TotalCount = count;
await TotalCountChanged.InvokeAsync(count);
}
protected void OnTotalCountChanged()
{
TotalCountChanged?.Invoke(this, EventArgs.Empty);
}