using SciChart.Charting.Model.Filters;
// ...

// 1. Given a List<Tick> where Tick is defined as
public class Tick
{
    public Tick()
    {
    }
    public Tick(DateTime date, double open, double high, double low, double close, long volume)
    {
        DateTime = date;
        Open = open;
        High = high;
        Low = low;
        Close = close;
        Volume = volume;
    }
    public DateTime DateTime { get; set; }
    public double Open { get; set; }
    public double High { get; set; }
    public double Low { get; set; }
    public double Close { get; set; }
    public long Volume { get; set; }
}
// 2. Append your ticks or trades to an OhlcDataSeries.
OhlcDataSeries<DateTime, double>() _priceData = new OhlcDataSeries<DateTime, double>();
_priceData.Append(_ticks.Select(x=>x.DateTime), _ticks.Select(x => x.Open), _ticks.Select(x => x.High), _ticks.Select(x => x.Low), _ticks.Select(x => x.Close));
// 3. Now aggregate using the FilterExtensions .AggregateBy* extension methods
private void UpdatePriceChart(AggregationPriceChart barStyle)
{
    switch (barStyle)
    {
        case AggregationPriceChart.Count:
            PriceSeries = (IOhlcDataSeries<DateTime, double>)_priceData.AggregateByCount(_selectedCount);
            break;
        case AggregationPriceChart.Time:
            PriceSeries = (IOhlcDataSeries<DateTime, double>)_priceData.AggregateByTime(TimeSpan.FromMinutes(_selectedTimeFrame));
            break;
        case AggregationPriceChart.Volume:
            PriceSeries = (IOhlcDataSeries<DateTime, double>)_priceData.AggregateByVolume(_ticks.Select(x => x.Volume.ToDouble()).ToList(), _selectedVolume);
            break;
        case AggregationPriceChart.Range:
            PriceSeries = (IOhlcDataSeries<DateTime, double>)_priceData.AggregateByRange(_selectedRange);
            break;
        case AggregationPriceChart.Renko:
            PriceSeries = (IOhlcDataSeries<DateTime, double>)_priceData.AggregateByRenko(_selectedBrickSize);
            break;
    }
   
    // Further filters may be applied such as Moving averages using the Filters API    
    Sma50Series = (IXyDataSeries<DateTime, double>)((IXyDataSeries<DateTime, double>) PriceSeries.ToMovingAverage(50));
    Sma50Series.SeriesName = "50 SMA";
}