public double SumAsDouble(string attrDefName)
{
double count = 0;
var sql = SqlQueryBuilder.Build(DataContext, Def);
sql.AddAttribute(attrDefName, SqlQuerySummaryFunction.Sum);
using (var reader = new SqlQueryReader(DataContext, sql))
{
reader.Open();
if (reader.Read())
{
if (!reader.IsDbNull(0))
{
if (reader.Reader.GetFieldType(0) == typeof(double))
{
count = reader.GetDouble(0);
}
else if (reader.Reader.GetFieldType(0) == typeof(decimal))
{
count = (double)reader.GetDecimal(0);
}
}
}
reader.Close();
}
return(count);
}