0

There's a enum type:

public enum Cat {
    [EnumMember(Value = "white_cat")]
    WhiteCat,
    [EnumMember(Value = "black_cat")]
    BlackCat
}

but use as follow asp.net core 2.2 model binding, it will binding failure:

public class A {
    public Cat TheCat { get; set; }
}

public class XXXController : ControllerBase {
    public ActionResult XXX([FromForm] Cat cat) {
        // ...
    }
}
huang
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    "not work for asp.net core 2.2" - Could you please be more descriptive ? .Net Core do support EnumMember https://learn.microsoft.com/en-us/dotnet/api/system.runtime.serialization.enummemberattribute?view=netframework-4.8 – Anu Viswan Dec 02 '19 at 01:53
  • @AnuViswan edited. I know it's not work for asp.net core, so I ask any alternates. – huang Dec 02 '19 at 01:57
  • Does this answer your question? [How to use enums with EnumMember attribute in FromBody ViewModel in Web API Request?](https://stackoverflow.com/questions/58270237/how-to-use-enums-with-enummember-attribute-in-frombody-viewmodel-in-web-api-requ) – Simply Ged Dec 02 '19 at 03:53

1 Answers1

4

Reference: https://stackoverflow.com/a/58338955/3907561

public class EnumMemberConverter<T> : EnumConverter {
    public EnumMemberConverter(Type type) : base(type) { }

    public override object ConvertFrom(ITypeDescriptorContext context, 
                                       CultureInfo culture, 
                                       object value) {
        var type = typeof(T);

        foreach (var field in type.GetFields()) {
            if (Attribute.GetCustomAttribute(field, typeof(EnumMemberAttribute)) is EnumMemberAttribute attribute &&
                value is string enumValue &&
                attribute.Value == enumValue) {
                return field.GetValue(null);
            }
        }

        return base.ConvertFrom(context, culture, value);
    }
}

usage:

[TypeConverter(typeof(EnumMemberConverter<Cat>))]
public enum Cat {
    [EnumMember(Value = "white_cat")]
    WhiteCat,
    [EnumMember(Value = "black_cat")]
    BlackCat
}
huang
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