how to get umbracohelper in a custom attribute without di - Using Umbraco and getting started

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nickornotto 403 posts 907 karma points

May 18, 2022 @ 16:18

How to get UmbracoHelper in a custom attribute without DI?

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 403 posts 907 karma points

May 18, 2022 @ 22:59

0

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

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Dave Woestenborghs 3504 posts 12135 karma points MVP 9x admin c-trib

May 19, 2022 @ 07:13

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 403 posts 907 karma points

May 19, 2022 @ 15:01

0

Bril, thank you!

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