/// <summary> /// Gets the <see cref="UnitInfo"/> whose <see cref="BaseUnits"/> is a subset of <paramref name="baseUnits"/>. /// </summary> /// <example>Length.Info.GetUnitInfoFor(unitSystemWithFootAsLengthUnit) returns <see cref="UnitInfo" /> for <see cref="LengthUnit.Foot" />.</example> /// <param name="baseUnits">The <see cref="BaseUnits"/> to check against.</param> /// <returns>The <see cref="UnitInfo"/> that has <see cref="BaseUnits"/> that is a subset of <paramref name="baseUnits"/>.</returns> /// <exception cref="ArgumentNullException"><paramref name="baseUnits"/> is null.</exception> /// <exception cref="InvalidOperationException">No unit was found that is a subset of <paramref name="baseUnits"/>.</exception> /// <exception cref="InvalidOperationException">More than one unit was found that is a subset of <paramref name="baseUnits"/>.</exception> public UnitInfo GetUnitInfoFor(BaseUnits baseUnits) { if (baseUnits == null) { throw new ArgumentNullException(nameof(baseUnits)); } var matchingUnitInfos = UnitInfos .Where((unitInfo) => unitInfo.BaseUnits.IsSubsetOf(baseUnits)) .Take(2) .ToArray(); var firstUnitInfo = matchingUnitInfos.FirstOrDefault(); if (firstUnitInfo == null) { throw new InvalidOperationException($"No unit was found that is a subset of {nameof(baseUnits)}"); } if (matchingUnitInfos.Length > 1) { throw new InvalidOperationException($"More than one unit was found that is a subset of {nameof(baseUnits)}"); } return(firstUnitInfo); }
/// <summary> /// Gets an <see cref="IEnumerable{T}"/> of <see cref="UnitInfo"/> that have <see cref="BaseUnits"/> that is a subset of <paramref name="baseUnits"/>. /// </summary> /// <param name="baseUnits">The <see cref="BaseUnits"/> to check against.</param> /// <returns>An <see cref="IEnumerable{T}"/> of <see cref="UnitInfo"/> that have <see cref="BaseUnits"/> that is a subset of <paramref name="baseUnits"/>.</returns> /// <exception cref="ArgumentNullException"><paramref name="baseUnits"/> is null.</exception> public IEnumerable <UnitInfo> GetUnitInfosFor(BaseUnits baseUnits) { if (baseUnits is null) { throw new ArgumentNullException(nameof(baseUnits)); } return(UnitInfos.Where((unitInfo) => unitInfo.BaseUnits.IsSubsetOf(baseUnits))); }