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I have an MVC 3 web app that uses Razor view engine. I would like to extend default editor templates so I'd like to add additional HTML5 attributes to input elements like autofocus . I'm using AdditionalMetadataAttribute to specify certain properties on my entity to be autofocus: public class MyEntity { public int Id { get; set; } [Required] [AdditionalMetadata("autofocus", true)] [DataType(DataType.Text)] public string Name { get; set; } ... } Since view scaffolding uses EditorFor method I decided to play along and wanted to override default String.cshtml template so that it would also add any additional metadata as attributes. To play along means that I don't want to use TextBoxFor where I can control input's attributes. This is my slightly changes String.cshtml that adds all additional metadata attributes as input HTML attributes: @{ // System.Diagnostics.Debugger.Break(); this.ViewData.ModelMetadata.AdditionalValues.Add("class", "text-box single-line"); } @Html.TextBox(string.Empty, ViewContext.ViewData.TemplateInfo.FormattedModelValue, this.ViewData.ModelMetadata.AdditionalValues) This template should render the same input type=text with the same CSS classes but also with additional attributes if any of them are provided. I then put this file in the ~/Views/Shared/EditorTemplates/ folder but it seems this template never gets picked up, because all I get is just the default input text box. What am I doing wrong?

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