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  • nickornotto 397 posts 900 karma points
    May 18, 2022 @ 16:18
    nickornotto
    0

    How to get UmbracoHelper in a custom attribute without DI?

    Using Umbraco And Getting Started
    Umbraco 9

    I am trying to create a custom attribute that uses umbraco dictionary value.

    I do not know how to get the UmbracoHelper instance as I don't thunk a custom attribute supports dependency injection.

    Any thoughts how to get UmbracoHelper in other way than DI?

    This is what I have:

    [AttributeUsage(AttributeTargets.Method | AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
public sealed class UmbracoDisplayAttribute : DisplayNameAttribute
{
    private readonly UmbracoHelper _umbracoHelper; // <- this value is missing

    // This is a positional argument
    public UmbracoDisplayAttribute(string dictionaryKey)
        : base(dictionaryKey)
    {
    }

    public override string DisplayName
    {
        get
        {
            return _umbracoHelper != null ? _umbracoHelper.GetDictionaryValue(base.DisplayName) : string.Empty;
        }
    }
}
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  • nickornotto 397 posts 900 karma points
    May 18, 2022 @ 22:59
    nickornotto
    0

    Is there any way of getting UmbracoHelper without DI in Umbraco 9?

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  • Dave Woestenborghs 3504 posts 12133 karma points MVP 8x admin c-trib
    May 19, 2022 @ 07:13
    Dave Woestenborghs
    101

    Hi nickornotto,

    Dependency injection in attributes is not possible. This not a Umbraco thing but .NET thing.

    You could retrieve the dependency in your attribute using the service locator pattern.

    [AttributeUsage(AttributeTargets.Method | AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
public sealed class UmbracoDisplayAttribute : DisplayNameAttribute
{
    // This is a positional argument
    public UmbracoDisplayAttribute(string dictionaryKey)
        : base(dictionaryKey)
    {
    }

    public override string DisplayName
    {
        get
        {
var umbracoHelper =  new HttpContextAccessor().HttpContext.RequestServices.GetService<UmbracoHelper>();
            return umbracoHelper != null ? umbracoHelper.GetDictionaryValue(base.DisplayName) : string.Empty;
        }
    }
}
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  • nickornotto 397 posts 900 karma points
    May 19, 2022 @ 15:01
    nickornotto
    0

    Bril, thank you!

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