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  • Dermot Curran 5 posts 95 karma points
    May 17, 2019 @ 15:40
    Dermot Curran
    0

    Creating parameterless constructor for custom ViewModels umbraco 8

    Hello Umbraco people,

    I tried to post back a form using a custom model to a surface controller and got 'No parameterless constructor defined for this object'. My model is as follows:

    public class ExampleViewModel : ContentModel
    {
        public ExampleViewModel(IPublishedContent content) : base(content){ }
    
        //properties etc...
    }
    

    My controller is as follows:

        public class ExampleSurfaceController : SurfaceController
    {
        [HttpPost]
        [ValidateAntiForgeryToken]
        public async Task<ActionResult> ExampleAction(ExampleViewModel model)
        {
            //do things
        }
    }
    

    I know from previous versions of umbraco this could be achieved by adding the following to the model:

    public ExampleViewModel () : base(new UmbracoHelper(UmbracoContext.Current).TypedContent(UmbracoContext.Current.PageId)) { }
    

    My question is, how is this achieved in Umbraco 8?

  • Søren Gregersen 297 posts 1160 karma points MVP c-trib
    May 17, 2019 @ 17:21
    Søren Gregersen
    0

    Why do you require the submitted model to derive from content model?

  • Dermot Curran 5 posts 95 karma points
    May 20, 2019 @ 09:18
    Dermot Curran
    0

    I use it when rendering the view:

    public class ExampleController : RenderMvcController
    {
        [HttpGet]        
        public ActionResult ExampleAction(ContentModel contentModel)
        {
            var model = new ExampleViewModel(contentModel.Content);
    
            return CurrentTemplate(model);
        }
    }
    
  • Dermot Curran 5 posts 95 karma points
    May 20, 2019 @ 11:43
    Dermot Curran
    100

    Found the solution, by using the Umbraco.Web.Composing library and adding this constructor to my model:

    public ExampleViewModel() : base(Current.UmbracoHelper.AssignedContentItem){ }
    
  • Søren Gregersen 297 posts 1160 karma points MVP c-trib
    May 20, 2019 @ 11:51
    Søren Gregersen
    0

    As long as you know what dependencies you are relying on :)

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