Get localized display attribute in a controller using Asp.Net Core

Question

I have an enum type that is localized using DisplayAttribute, a resource file and aspnetcore built in localization support. I can successfully verify that the localization works in a view by for example using

Html.GetEnumSelectList<TypeExample>().

How can I get the same localized DisplayAttribute in a controller or even a Model.

I tried using code like:

var name = TypeExample.A.GetType()?
            .GetMember(TypeExample.A.ToString())?
            .FirstOrDefault()?
            .GetCustomAttribute<DisplayAttribute>()?.GetName();

but it does not return the localized display name.

I would like to use it in a model for an ApiController eg.

public class Model
{
    public TypeExample Type { get; set; }

    public string TypeDisplayValue => Type.GetDisplayValue()
}

You can use an attribute for this, I believe. stackoverflow.com/questions/33463166/… — Tim Maes
– Tim Maes, Commented May 22, 2019 at 8:59
I am using DisplayAttribute. Will try some of the solutions there later. However, first try did not work. — KapJon
– KapJon, Commented May 22, 2019 at 9:34

KapJon · Accepted Answer · 2019-05-25 03:06:18Z

2

Finally I succeeded with this task.

I created a enum translator service that is registered i startup as transient service

public class EnumTranslatorService:IEnumTranslatorService
{
    private IModelMetadataProvider _metadataProvider;

    public EnumTranslatorService(IModelMetadataProvider metadataProvider)
    {
        _metadataProvider = metadataProvider;
    }

    public string TranslateDisplayName<TEnum>(TEnum e) where TEnum : struct
    {
        var a = _metadataProvider.GetMetadataForType(e.GetType());
        var name = a.EnumGroupedDisplayNamesAndValues.FirstOrDefault(t => 
                       t.Value ==  a.EnumNamesAndValues[e.ToString()]).Key.Name;

        return name ?? e.ToString();
    }
}

It uses IModelMetadataProvider that is created in aspnetcore. Once injected I use it as:

_enumTranslatorService.TranslateDisplayName(EnumExampleType.A)

edited May 25, 2019 at 3:06

answered May 24, 2019 at 11:53

KapJon

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1 Comment

Ivaylo Over a year ago

This was the only approach which allowed me to display the localized enum display name using the ShraredLocalizer approach with the dummy class and single resx file for every language.

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