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Custom Aggregate Function: AggDistinctSum()

Review the documentation on Custom Aggregate Functions for full details on developing and implementing this function.

DescriptionReturns the sum of only unique values in a series.
Arguments
  • dataToAggregate: the value to sum, accepts data fields or cell references. Required.
  • recordLevel: indicates whether to aggregate by recordLevel (true) or entity level (false). Optional, defaults to true if not provided.
Namespaces
  • WebReports.Api.Common
  • WebReports.Api.Custom
  • System.Collections.Generic
References
  • System.Core.dll
ExampleAggDistinctSum({OrderDetails.Revenue})

Program Code

public class AggDistinctSum : ICustomAggregator
{
    HashSet<Decimal> list = new HashSet<Decimal>();
    
	public void AddValue(SessionInfo sessionInfo, object value, params object[] args)
	{
		Decimal curVal;
        
        if (value == null)
            curVal = 0;
        else if (!Decimal.TryParse(value.ToString(), out curVal))
        {
            throw new WrAggregationException(@"Tried to take the sum of a set 
                                              containing a non-number");
        }
        
        this.list.Add(curVal);
	}

	public object Result(SessionInfo sessionInfo)
	{
	    Decimal sum = 0;
        foreach (Decimal val in this.list)
        {
            sum += val;
        }
        return sum;
	}
}
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