public double?Read(ISqDataRecordReader recordReader, int ordinal) => !recordReader.IsDBNull(ordinal) ? recordReader.GetDouble(ordinal) : null;
public double Read(ISqDataRecordReader recordReader) => recordReader.GetDouble(this.ColumnName.Name);
public double Read(ISqDataRecordReader recordReader, int ordinal) => recordReader.GetDouble(ordinal);