Injecting DI service on a extension method

问题

I'm trying to get the IStringLocalizer service instance inside a extension method, is it possible? Any suggestions on how should I inject it?

My goal here is to translate a type using its name as convention.

public static class I18nExtensions
{

    private IStringLocalizer _localizer; // <<< How to inject it?

    public static string GetName(this Type type)
    {
        return _localizer[type.Name].Value;
    }
}

回答1:

Following @NightOwl888 comment I was in the wrong path, I ended up creating the following service:

public class TypeNameLocalizer : ITypeNameLocalizer
{
    private IStringLocalizer localizer;

    public TypeNameLocalizer(IStringLocalizer<Entities> localizer) 
    {
        this.localizer = localizer;
    }
    public string this[Type type] 
    { 
        get
        {
            return localizer[type.Name];
        }
    }
}

Credit: @NightOwl888

回答2:

Why not just pass the IStringLocalizer as a parameter:

public static string GetName(this Type type, IStringLocalizer localizer)
{
    return localizer[type.Name].Value;
}

The purpose of extension methods is to extend behavior of objects. It seems to me that is what you're trying to do here.

来源：https://stackoverflow.com/questions/42235948/injecting-di-service-on-a-extension-method