Extension methods with Enumeration
suggest changeExtension methods are useful for adding functionality to enumerations.
One common use is to implement a conversion method.
public enum YesNo
{
Yes,
No,
}
public static class EnumExtentions
{
public static bool ToBool(this YesNo yn)
{
return yn == YesNo.Yes;
}
public static YesNo ToYesNo(this bool yn)
{
return yn ? YesNo.Yes : YesNo.No;
}
}
Now you can quickly convert your enum value to a different type. In this case a bool.
bool yesNoBool = YesNo.Yes.ToBool(); // yesNoBool == true
YesNo yesNoEnum = false.ToYesNo(); // yesNoEnum == YesNo.No
Alternatively extension methods can be used to add property like methods.
public enum Element
{
Hydrogen,
Helium,
Lithium,
Beryllium,
Boron,
Carbon,
Nitrogen,
Oxygen
//Etc
}
public static class ElementExtensions
{
public static double AtomicMass(this Element element)
{
switch(element)
{
case Element.Hydrogen: return 1.00794;
case Element.Helium: return 4.002602;
case Element.Lithium: return 6.941;
case Element.Beryllium: return 9.012182;
case Element.Boron: return 10.811;
case Element.Carbon: return 12.0107;
case Element.Nitrogen: return 14.0067;
case Element.Oxygen: return 15.9994;
//Etc
}
return double.Nan;
}
}
var massWater = 2*Element.Hydrogen.AtomicMass() + Element.Oxygen.AtomicMass();
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