StrEnum.EntityFrameworkCore 2.0.0

.NET 6.0 .NET Standard 2.0
NuGet\Install-Package StrEnum.EntityFrameworkCore -Version 2.0.0
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.
dotnet add package StrEnum.EntityFrameworkCore --version 2.0.0
<PackageReference Include="StrEnum.EntityFrameworkCore" Version="2.0.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add StrEnum.EntityFrameworkCore --version 2.0.0
#r "nuget: StrEnum.EntityFrameworkCore, 2.0.0"
#r directive can be used in F# Interactive, C# scripting and .NET Interactive. Copy this into the interactive tool or source code of the script to reference the package.
// Install StrEnum.EntityFrameworkCore as a Cake Addin
#addin nuget:?package=StrEnum.EntityFrameworkCore&version=2.0.0

// Install StrEnum.EntityFrameworkCore as a Cake Tool
#tool nuget:?package=StrEnum.EntityFrameworkCore&version=2.0.0


Allows to use StrEnum string enums with Entity Framework Core.

Supports EF Core 3.1–6.0


You can install StrEnum.EntityFrameworkCore using the .NET CLI:

dotnet add package StrEnum.EntityFrameworkCore


Define a string enum and an entity that uses it:

public class Sport: StringEnum<Sport>
    public static readonly Sport RoadCycling = Define("ROAD_CYCLING");
    public static readonly Sport MountainBiking = Define("MTB");
    public static readonly Sport TrailRunning = Define("TRAIL_RUNNING");

public class Race
    public Guid Id { get; private set; }
    public string Name { get; private set; }
    public Sport Sport { get; private set; }

    private Race()

    public Race(string name, Sport sport)
        Id = Guid.NewGuid();
        Name = name;
        Sport = sport;

And call the UseStringEnums() method when configuring your DB context:

public class RaceContext: DbContext
    public DbSet<Race> Races { get; set; }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        optionsBuilder.UseSqlServer(@"Server=.;Database=BestRaces;user id=*;pwd=*;")

That's it! EF Core is now able to deal with string enums.


EF Core will store string enums in non-nullable string columns (NVARCHAR(MAX) in SQL Server, TEXT in Postgres).

Running dotnet ef migrations add Init will produce the following migration:

        name: "Races",
        columns: table => new
            Id = table.Column<Guid>(type: "uniqueidentifier", nullable: false),
            Name = table.Column<string>(type: "nvarchar(max)", nullable: false),
            Sport = table.Column<string>(type: "nvarchar(max)", nullable: false)
        constraints: table =>
            table.PrimaryKey("PK_Races", x => x.Id);

In order to store a nullable string enum, mark the property is non-required when configuring your entity:

var race = builder.Entity<Race>();

race.Property(p => p.Sport).IsRequired(false);


EF Core will translate LINQ operations on string enums into SQL.

Let's add some races first:

var context = new RaceContext();

await context.Database.EnsureDeletedAsync();
await context.Database.EnsureCreatedAsync();

var races = new[]
    new Race("Chornohora Sky Marathon", Sport.TrailRunning),
    new Race("Cape Town Cycle Tour", Sport.RoadCycling),
    new Race("Cape Epic", Sport.MountainBiking)

await context.Races.AddRangeAsync(races);

await context.SaveChangesAsync();

And filter by a single Sport:

var trailRuns = await context.Races.Where(o => o.Sport == Sport.TrailRunning).ToArrayAsync();

That will produce the following SQL:

SELECT [r].[Id], [r].[Name], [r].[Sport]
FROM [Races] AS [r]

You can also query by multiple Sport values:

var cyclingSport = new[] { Sport.MountainBiking, Sport.RoadCycling };

var racesThatRequireABicycle = await context.Races.Where(o => cyclingSport.Contains(o.Sport)).ToArrayAsync();

Which will translate to the following SQL:

SELECT [r].[Id], [r].[Name], [r].[Sport]
FROM [Races] AS [r]


Thanks to Andrew Lock for his research on using custom ValueConverterSelector.


Copyright © 2022 Dmitry Khmara.

StrEnum is licensed under the MIT license.

Product Versions
.NET net5.0 net5.0-windows net6.0 net6.0-android net6.0-ios net6.0-maccatalyst net6.0-macos net6.0-tvos net6.0-windows
.NET Core netcoreapp2.0 netcoreapp2.1 netcoreapp2.2 netcoreapp3.0 netcoreapp3.1
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Version Downloads Last updated
2.0.0 66 7/30/2022
1.1.0 104 5/20/2022
1.0.2 60 5/20/2022
1.0.1 85 5/11/2022
1.0.0 72 5/5/2022
0.0.1 78 5/5/2022