Example of using AdditionalMetadata in MVC 3

Question

In asp.net MVC 3 there is a new attribute that allows us to pass additional Meta Data to our views e.g.

    [Required]
    [AdditionalMetadata("Tooltip", "The title of the item")]
    public string Title { get; set; }

The question is, how do I actually make use of this information in my view? I thought that perhaps it would render out the data as html 5 data attributes but this is not the case.

A simple example would be much appreciated.

AFAIK, you're responsible for rummaging through ModelMetadata.AdditionalValues within your templates to make use of this. Dunno if there are any "default" keys that come in useful out of the box. — user1228
– user1228, Commented Jan 17, 2011 at 17:05

Darin Dimitrov · Accepted Answer · 2011-01-17 17:02:45Z

17

According to the documentation:

You can use the AdditionalMetadataAttribute class to populate the ModelMetadata.AdditionalValues dictionary for a model property.

...

This metadata is made available to any display or editor template when a product view model is rendered. It is up to you as application developer to interpret the metadata information.

So let's make use of it in the view:

<h2>
    @ModelMetadata.FromLambdaExpression(x => x.Title, ViewData).AdditionalValues["Tooltip"]
</h2>

answered Jan 17, 2011 at 17:02

Darin Dimitrov

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2 Comments

Anthony Johnston Over a year ago

Would you also show us it working in an Editor Template? - ta

Anthony Johnston Over a year ago

me again, sorry, ViewData.ModelMetadata.AdditionalValues["Tooltip"]

John Lord · Accepted Answer · 2019-10-18 15:20:42Z

0

example in a template:

Object optionlabelOverride;
ViewData.ModelMetadata.AdditionalValues.TryGetValue("OptionLabelText", out optionLabelOverride);

the variable you are reading must be an object and then you can cast it. Everything you set in the model is available as ViewData.

answered Oct 18, 2019 at 15:20

John Lord

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