CODEWITHSUNDEEP
dependency-injectionprismunity-container
tech74
tech74

Reputation: 1659

Propery injection not working with Prism Unity

We have a WPF application using Prism (7.2.0.1422) and Unity as the DI container. I have the following class where I am attempting to use Unity Property injection

  public class LocalizedDescriptionAttribute : DescriptionAttribute
  {
    [Dependency]
    IStringResource _stringResource { get; set; }
    string _resourceKey;
    public LocalizedDescriptionAttribute(string resourceKey)
    {
        _resourceKey = resourceKey;
    }

    public override string Description
    {
        get
        {
            string description = _stringResource.GetString(_resourceKey);
            return string.IsNullOrWhiteSpace(description) ? string.Format("[[{ 0}]]", _resourceKey) : description;
         }
      }
  }

   _stringResource  is always null. I have registered the type as a singleton like this in RegisterTypes

     containerRegistry.RegisterSingleton<IStringResource, StringResource>();

Anyone any ideas. Thanks

Upvotes: 1

Views: 141

Answers (1)

Haukinger
Haukinger

Reputation: 10863

Based on the name of the class, I assume it's an actual attribute? That cannot have anything injected by Unity, because the container can only inject into instances it creates itself.

You can, however, use the container from the attribute's code through a detour: the CommonServiceLocator. That's a static class that you only use if you have to, and this may be one of the rare cases where it's a good idea. You can use it to resolve the IStringResource from the container at runtime.

Upvotes: 1

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