/// <summary>
/// Converts a unit value from the source terms to the target terms.
/// </summary>
/// <param name="val">Decimal value of the source terms</param>
/// <param name="sourceSymbol">Unit symbol of the source value</param>
/// <param name="targetSymbol">Unit symbol of the target value</param>
/// <returns>Converted value</returns>
public static decimal?Convert(decimal val, string sourceSymbol, string targetSymbol)
{
IEnumerable <SIUnits.Abstracts.BaseUnit> units = SIUnits.UnitManager.GetUnits();
SIUnits.Abstracts.BaseUnit source = units.FirstOrDefault(o => o.Symbol == sourceSymbol);
SIUnits.Abstracts.BaseUnit target = units.FirstOrDefault(o => o.Symbol == targetSymbol);
if (source == null)
{
throw new Exception("Couldn't determine appropriate source unit from '" + sourceSymbol + "'.");
}
else if (target == null)
{
throw new Exception("Couldn't determine appropriate target unit from '" + targetSymbol + "'.");
}
return(Convert(val, source, target));
}
/// <summary>
/// Converts a unit value from the source terms to the target terms.
/// </summary>
/// <param name="val">Decimal value of the source terms</param>
/// <param name="source">Unit of the source value</param>
/// <param name="target">Unit of the target value</param>
/// <returns></returns>
public static decimal?Convert(decimal val, SIUnits.Abstracts.BaseUnit source, SIUnits.Abstracts.BaseUnit target)
{
decimal output = 0;
if (source.Base == target.Base)
{
decimal baseValue = 0;
string from = "",
to = "",
bas = "";
if (source != null)
{
if (source.GetType().IsAssignableFrom(typeof(FactoredUnit)))
{
baseValue = val / (source as FactoredUnit).Factor;
bas = (source as FactoredUnit).DerivedFrom;
from = source.Symbol;
}
else
{
baseValue = val;
bas = source.Symbol;
from = source.Symbol;
}
}
else
{
throw new Exception("Source unit cannot be null.");
}
if (target != null)
{
if (target.GetType().IsAssignableFrom(typeof(FactoredUnit)))
{
if ((target as FactoredUnit).DerivedFrom == bas)
{
to = target.Symbol;
output = baseValue * (target as FactoredUnit).Factor;
}
else
{
throw new Exception("Both units must come from the same derivation.");
}
}
else
{
if (target.Symbol == bas)
{
to = target.Symbol;
output = baseValue;
}
else
{
throw new Exception("Both units must come from the same derivation.");
}
}
}
else
{
throw new Exception("Target unit cannot be null.");
}
if (string.IsNullOrEmpty(from) ||
string.IsNullOrEmpty(to) ||
string.IsNullOrEmpty(bas))
{
throw new Exception("Cannot convert items that are not derived from the same base unit.");
}
}
else
{
throw new Exception("Source and Target units must be within the same unit class (ie. " + source.Base.ToString() + " or " + target.Base.ToString() + ")");
}
return(output);
}