ASP.Net MVC, Dynamic Property and EditorFor/LabelFor

Question

I am using MVC 3 w/ Razor and using the new dynamic ViewBag property. I would like to use the ViewBag property with the EditorFor/LabelFor Html helpers but can't figure out the syntax.

The View does have a @model set, but the object I am trying to use is not part of that model. I am aware I can create a ViewModel but that is not what I am after.

Can anyone help?

Controller:

   var myModel= _repo.GetModel(id);
   var newComment = new Comment();

   ViewBag.NewComment = newComment;

   return View(myModel);

View:

@model Models.MyModel

@(Html.EditorFor(ViewBag.NewComment.Comment))

Anton · Accepted Answer · 2011-02-10 14:05:26Z

5

I haven't tried it, but this should work I think.

@(EditorFor(m => ViewBag.NewComment)

It is possible to use a Linq-to-SQL syntax, but use a completely different object on the right side.

answered Feb 10, 2011 at 14:05

Anton

1,39613 silver badges31 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Anthony Longano Over a year ago

@bahadirarslan This doesn't work (An expression tree cannot contain a dynamic expression). As a possible workaround you can cast the dynamic model to its underlying type (See my answer for this workaround).

Bron Davies Over a year ago

This also doesn't work for custom editors. For instance using a UIHint like this [DataType(DataType.Html), UIHint("tinymce_jquery_full"), AllowHtml] on your model. It's better to create a partial view and pass a model object to it.

kim3er · Accepted Answer · 2010-12-20 22:46:03Z

1

Not knowing what your Comment Model looks like, my gut reaction would be to just do:

@Html.EditorFor(ViewBag.NewComment)

However, because ViewBag is dynamic, you may need to cast NewComment before you use it, in order to get the EditorFor magic.

@Html.EditorFor(ViewBag.NewComment as Comment)

Update

Strike that, EditorFor can only accept an Expression as a parameter, and that Expression must return a property of the page model. I don't think EditorFor or EditorForModel are going to be of any use to you if you don't want to use a ViewModel. Have you considered switching the roles of whatever it is you're using the Model for, with that of the ViewBag?

edited Dec 20, 2010 at 22:46

answered Dec 20, 2010 at 22:33

kim3er

6,5365 gold badges44 silver badges73 bronze badges

3 Comments

B Z Over a year ago

did you mean "Have you considered switching the roles of whatever it is you're using the Model for, with that of the VIEWMODEL" ? Otherwise, I am not sure what you mean.

kim3er Over a year ago

Hi, I mean EditorFor seems to be geared for use with the page's model. It is certainly the way I've always used it. But I can see merit in what you're trying to achieve. What I mean is, you're currently assigning a model from your repository to the page model. What if you assigned the repo model to the ViewBag and the Comment to the page model? Is that possible in your View? Could you elaborate on why you don't want to use a ViewModel?

B Z Over a year ago

I have several models I am using on the page, so I can't just swap one for another. What is frustrating is I think it is possible (or should be), just don't know the syntax.

Anthony Longano · Accepted Answer · 2014-05-15 11:08:11Z

1

If for some reason I need to use ViewData to pass the model into my view I do the following to allow for the Html.DisplayFor() helpers.

In the views code block I cast the ViewData model object to its underlying type

var newCommentModel = ( NewComment )ViewBag.NewComment;

Then I assign the following expression to the helper using the strong-typed reference

@Html.DisplayFor( model => newCommentModel )

The expression tree now contains a strongly-typed model and the DisplayTemplate is correctly displayed.

answered May 15, 2014 at 11:08

Anthony Longano

3353 silver badges10 bronze badges

Collectives™ on Stack Overflow

ASP.Net MVC, Dynamic Property and EditorFor/LabelFor

3 Answers 3

2 Comments

3 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

2 Comments

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related