C#: How to store enum value as lowercase string in MongoDB

Question

I'm trying to save an enum value as lowercase or with my custom representation on MongoDB using the C# driver. I already figured out how to save the enum value as string on the database, doing something like this

class MyClass
{
   ...
   [BsonRepresentation(representation: BsonType.String)]
   public MyEnum EnumValue { get; set; }
   ...
}

and the enum class is like this

[JsonConverter(converterType: typeof(StringEnumConverter))]
enum MyEnum 
{
   [EnumMember(Value = "first_value")]
   FirstValue,
   [EnumMember(Value = "second_value")]
   SecondValue
}

But on MongoDB the enum value is stored as it is in the enum class (not like what is specified in the EnumMember attribute). How can I tell MongoDB to store the enum value lowercase or with the EnumMember value?

check this link that will help you MongoDB sorry

Marwen Jaffel
– Marwen Jaffel

2019-12-09 14:01:51 +00:00
Commented Dec 9, 2019 at 14:01 — Marwen Jaffel
– Marwen Jaffel, Commented Dec 9, 2019 at 14:01
Ehm.... you linked my same question 😅

Jimi
– Jimi

2019-12-09 14:03:01 +00:00
Commented Dec 9, 2019 at 14:03 — Jimi
– Jimi, Commented Dec 9, 2019 at 14:03
check this link

Marwen Jaffel
– Marwen Jaffel

2019-12-09 14:04:32 +00:00
Commented Dec 9, 2019 at 14:04 — Marwen Jaffel
– Marwen Jaffel, Commented Dec 9, 2019 at 14:04
Thanks, a custom serializer worked :)

Jimi
– Jimi

2019-12-09 14:49:13 +00:00
Commented Dec 9, 2019 at 14:49 — Jimi
– Jimi, Commented Dec 9, 2019 at 14:49

Etienne de Martel · Accepted Answer · 2022-10-13 19:59:02Z

1

You can create your own Serializer:

internal class LowerCaseEnumSerializer<T> : SerializerBase<T>
    where T : struct
{
    public override T Deserialize(BsonDeserializationContext context, BsonDeserializationArgs args)
    {
        var enumValue = CultureInfo.CurrentCulture.TextInfo.ToTitleCase(context.Reader.ReadString());

        return Enum.Parse<T>(enumValue);
    }

    public override void Serialize(BsonSerializationContext context, BsonSerializationArgs args, T value)
    {
        context.Writer.WriteString(value.ToString()?.ToLowerInvariant());
    }
}

And then use it like attribute:

[BsonSerializer(typeof(LowerCaseEnumSerializer<MyEnum>))]
public MyEnum EnumValue { get; set; }

edited Oct 13, 2022 at 19:59

Etienne de Martel

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answered Mar 10, 2022 at 13:24

sobakaodin

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