protected override async Task OnParametersSetAsync()
{
	if (CustomerId > 0)
	{
		_customer = await Kunde.GetKundeAsync(Kundennummer.ToString());
		if (_customer is not null)
		{
			/* More Stuff is happening here */

			Umsatzdaten = new Dictionary<int, Jahresumsatz>();
			for (int i = 0; i < UmsatzJahre; i++)
			{
				if(!Umsatzdaten.ContainsKey(i))
				{
					Umsatzdaten.Add(i, await customerService.GetCustomerDataAsync(_customer.KUND_A_NR, DateTime.Now.Year - i));
				}
			}

			InitChartData();
		}
		else
		{
			/* More Stuff is happening here */
		}
	}
}

private void InitChartData()
{

	_chartConfig = new LineConfig
	{
		Options = new LineOptions
		{
			Responsive = true,
			Title = new OptionsTitle
			{
				Display = true,
				Text = $"Umsatz der letzten {UmsatzJahre} Jahre"


			}
		}
	};

	_chartConfig.Data.Labels.Clear();
	_chartConfig.Data.Datasets.Clear();

	for (int i = 1; i <= 12; i++)
	{
		_chartConfig.Data.Labels.Add(System.Globalization.CultureInfo.CurrentCulture.DateTimeFormat.GetMonthName(i));
	}

	for (int i = 0; i < UmsatzJahre; i++)
	{
		string lbl = (DateTime.Now.Year - i).ToString();
		if (Umsatzdaten.ContainsKey(i))
		{
			IDataset<decimal> tmpDs = new LineDataset<decimal>(Umsatzdaten[i].ToIEnumerable())
			{
				Label = lbl,
				BackgroundColor = ColorUtil.FromDrawingColor(ChartHelper.GetColor(i)),
				BorderColor = ColorUtil.FromDrawingColor(ChartHelper.GetColor(i)),
				Fill = FillingMode.Disabled,
			};
			_chartConfig.Data.Datasets.Add(tmpDs);
		}
	}
}