Adds a [Description("Text")] attribute that you can use on enum values and get using the GetDescription method in order to return better-formatted strings than a simple ToString() would.
public enum MyEnum
{
[Description("First value")]
Value1,
[Description("Second value")]
Value2,
[Description("Third value")]
Value3
}public void Method(MyEnum value)
{
//Will return the string of text that is in the enum's [Description] attribute
var description = value.GetDescription();
...
//You can also use TryGetDescription which will never throw an exception and return the enum's ToString() result if it has no [Description]
var description2 = value.TryGetDescription();
}public void Method(MyEnum? value)
{
//Nullable enums are also supported and are used in the exact same way though bear in mind that null enums will throw an exception
var description = value.GetDescription();
...
//Will not throw an exception if it's null. It will return an empty string instead
var description2 = value.TryGetDescription();
}public void Method(MyEnum value)
{
//What if some bozo tries to pass something like (MyEnum)-8 for which there is no enum member defined?
value.ThrowIfUndefined(); //Will throw something along the lines of "Value '-8' is undefined for enum 'MyEnum'"
//Or you can do this if you don't like the above default message
value.ThrowIfUndefined("Better message!");
}public MyEnum Value
{
get => _value;
//You can also inline it in a set like so
init => _value = value.ThrowIfUndefined();
}