ObjectEnum 1.0.0

dotnet add package ObjectEnum --version 1.0.0
NuGet\Install-Package ObjectEnum -Version 1.0.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="ObjectEnum" Version="1.0.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add ObjectEnum --version 1.0.0
#r "nuget: ObjectEnum, 1.0.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install ObjectEnum as a Cake Addin
#addin nuget:?package=ObjectEnum&version=1.0.0

// Install ObjectEnum as a Cake Tool
#tool nuget:?package=ObjectEnum&version=1.0.0

ObjectEnum

ObjectEnum is a wrapper for enums, adding a certain degree of polymorphism.

Examples

Restrict enum values to a subset

Conssider the WorkDay class:

public class WorkDay : ObjectEnum<DayOfWeek>
{
    public WorkDay(DayOfWeek value)
        : base(value) { }

    private static readonly DayOfWeek[] Values = new[]
    {
        DayOfWeek.Monday, DayOfWeek.Tuesday, DayOfWeek.Wednesday,
        DayOfWeek.Thursday, DayOfWeek.Friday
    };

    protected override IReadOnlyCollection<DayOfWeek> GetDefinedValues()
        => Values;
}

Which will produce the following results:

var sunday = new WorkDay(DayOfWeek.Sunday); //throws exception

var monday = new WorkDay(DayOfWeek.Monday); //works fine
var label = $"{monday} is day {(int)monday}." //produces: "Monday is day 1."
var mondayIsAlwaysMonday = monday == DayOfWeek.Monday; //true, sorry...

Inheritance

Conssider these classes:

public class ChillDay : ObjectEnum<DayOfWeek>
{
    public ChillDay(DayOfWeek value)
        : base(value) { }

    private static readonly DayOfWeek[] Values = new[]
    {
        DayOfWeek.Saturday, DayOfWeek.Sunday
    };

    protected override IReadOnlyCollection<DayOfWeek> GetDefinedValues()
        => Values;
}

public class FunDay : ChillDay
{
    public FunDay(DayOfWeek value)
        : base(value) { }

    private static readonly DayOfWeek[] Values = new[]
    {
        DayOfWeek.Saturday, DayOfWeek.Sunday, DayOfWeek.Friday
    };

    protected override IReadOnlyCollection<DayOfWeek> GetDefinedValues()
        => Values;
}

Which will produce the following results:

var sunday = new ChillDay(DayOfWeek.Sunday);
var funday = new FundDay(DayOfWeek.Sunday);

var sundayIsFunday = sunday == funday; //true

In this case the comparison will return true, because FundDay inherits ChillDay. However in the case of a Workday, this would not be the case as there is no relation between a WorkDay and a FundDay.

var friday = new WorkDay(DayOfWeek.Friday);
var funday = new FundDay(DayOfWeek.Friday);

var workFridayIsNoFunFriday = friday == funday; //false

Switch cases

You can easily use a ObjectEnum in a switch case, however you will need to cast it to the appropriate enum.

var friday = new WorkDay(DayOfWeek.Friday);

switch((DayOfWeek)friday){
    case DayOfWeek.Monday:
        //do something monday related
        break;
        /*...*/
    case DayOfWeek.Friday:
        //do something friday related
        break;
}

Or cast it to an integer.

var friday = new WorkDay(DayOfWeek.Friday);

switch((int)friday){
    case 1:
        //do something monday related
        break;
        /*...*/
    case 5:
        //do something friday related
        break;
}

Declaring your own ObjectEnums


//you can optionally declare an abstract base type for your implementations
public abstract class Size : ObjectEnum<Size.Value>
{
    //define a single enum containing all possible values
    //it can be a nested enum like it is here,
    //but this is not required
    public enum Value
    {
        Unknown = 0,
        ExtraSmall = 1,
        Small = 2,
        Medium = 3,
        Large = 4,
        ExtraLarge = 5
    }

    protected Size(Value value)
        : base(value) { }
}

public class BasicSize : Size
{
    public BasicSize(Value value)
        : base(value) { }

    //declaring a static Values array reduces
    //the overhead on creating a new array each time
    //we instantiate a BasicSize object
    private static readonly Value[] Values = new[]
    {
        Value.Unknown, Value.Small, Value.Medium, Value.Large
    };

    //override GetDefinedValues to restrict the possible values for BasicSize
    protected override IReadOnlyCollection<Value> GetDefinedValues()
        => Values;
}

//inherit BasicSize so we can compare the values
public class ExtendedSize : BasicSize
{
    public ExtendedSize(Value value)
        : base(value) { }

    //not the prefered way, but should work
    protected override IReadOnlyCollection<Value> GetDefinedValues()
        => new[] {
            Value.Unknown, Value.ExtraSmall, Value.Small, Value.Medium, Value.Large, Value.ExtraLarge
        };
}

Other helpful stuff

As you may have noticed, it is easy to cast between a ObjectEnum and its underlying enum Type, as well as casting to the int representation.

Besides this, a number of helper methods are defined to help you instantiate ObjectEnums

var isFriday = WorkDay.TryParse("Friday", out var friday); //returns true, friday = new WorkDay(DayOfWeek.Friday)
var isMonday = WorkDay.TryParse("monday", ignoreCase: false, out var mondaytues); //returns true, monday = new WorkDay(DayOfWeek.Monday)
var tuesday =  WorkDay.Parse<WorkDay>("tuesday"); //returns new WorkDay(DayOfWeek.Tuesday)
var wednessday = WorkDay.Create<WorkDay>(DayOfWeek.Wednessday);  //returns new WorkDay(DayOfWeek.Wednessday)

You can also use the various overloads of IsDefined to determine whether a certain value is valid for the given ObjectEnum.

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.
  • .NETStandard 2.0

    • No dependencies.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

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Version Downloads Last updated
1.0.0 550 11/15/2019
1.0.0-alpha1 378 10/15/2019
1.0.0-alpha 379 10/15/2019

Added compare operators

Please refer to the GitHub repo for documentation as well as any issues, comments  or requests.