/// <summary>
/// Looks up point tag from measurement <paramref name="key"/> value.
/// </summary>
/// <param name="key"><see cref="MeasurementKey"/> to lookup.</param>
/// <param name="source">Source metadata.</param>
/// <returns>Point tag name from source metadata.</returns>
/// <remarks>
/// This function uses the <see cref="DataTable.Select(string)"/> function which uses a linear
/// search algorithm that can be slow for large data sets, it is recommended that any results
/// for calls to this function be cached to improve performance.
/// </remarks>
internal static string TagFromKey(this MeasurementKey key, DataSet source)
{
DataRow record = GetMetaData(source, "ActiveMeasurements", $"ID = '{key}'");
return((object)record == null?key.ToString() : record["PointTag"].ToNonNullString(key.ToString()));
}
public ActiveMeasurement()
{
m_key = MeasurementKey.Undefined;
ID = m_key.ToString();
SignalID = m_key.SignalID;
}
