首先想到的是System.TimeSpan，其中同一个类表示时间，您可以通过属性以不同的单位访问它。

您可以在内部以某个常量单位(可能是SI)存储该值，并将其转换为属性getter / setter：

Distance d = new Distance;

d.Meters = 5000;

var km = d.Kilometers; // km = 5;

或者您可以为每个单元创建类：

public sealed class DistanceUnit

{

public DistanceUnit(string name, string symbol, double scale)

{

Name = name;

Symbol = symbol;

Scale = scale;

}

public string Name { get; private set; }

public string Symbol { get; private set; }

public double Scale { get; private set; }

}

public abstract class Distance

{

protected Distance(double value)

{

this.Value = value;

}

protected Distance()

{

}

public double Value { get; set; }

public abstract DistanceUnit Unit { get; }

public override string ToString()

{

return this.Value + " " + Unit.Symbol;

}

public static void Convert(TIn original, out TOut result)

where TIn : Distance, new()

where TOut : Distance, new()

{

result = new TOut();

var scale = result.Unit.Scale / original.Unit.Scale;

result.Value = original.Value * scale;

}

}

public sealed class Meter : Distance

{

private static readonly DistanceUnit s_Unit = new DistanceUnit("Meter", "m", 1);

public Meter(double value) : base(value)

{

}

public Meter()

{

}

public override DistanceUnit Unit

{

get { return s_Unit; }

}

}

public sealed class Kilometer : Distance

{

private static readonly DistanceUnit s_Unit = new DistanceUnit("Kilometer", "km", .001);

public Kilometer()

{

}

public Kilometer(double value)

: base(value)

{

}

public override DistanceUnit Unit

{

get { return s_Unit; }

}

}

用得像

Meter distanceHome = new Meter(10000);

Kilometer distanceInKMs;

Distance.Convert(distanceHome, out distanceInKMs); // distanceInKMs.Value = 10