protected DataValue ComputeAnnotationCount(TimeSlice slice)
{
// get the values in the slice.
List<DataValue> values = GetValues(slice);
// check for empty slice.
if (values == null)
{
return GetNoDataValue(slice);
}
// count the values.
int count = 0;
for (int ii = 0; ii < values.Count; ii++)
{
count++;
}
// set the timestamp and status.
DataValue value = new DataValue();
value.WrappedValue = new Variant(count, TypeInfo.Scalars.Int32);
value.SourceTimestamp = GetTimestamp(slice);
value.ServerTimestamp = GetTimestamp(slice);
value.StatusCode = value.StatusCode.SetAggregateBits(AggregateBits.Calculated);
// return result.
return value;
}