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copied!<p>If you want this to work with a metadata class you need to use the following code. I know its not pretty but it gets the job done and prevents you from having to write your maxlength properties in both the Entity class and the View:</p> <pre><code>public static MvcHtmlString TextBoxFor2<TModel, TProperty> ( this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, object htmlAttributes = null ) { var member = expression.Body as MemberExpression; MetadataTypeAttribute metadataTypeAttr = member.Member.ReflectedType .GetCustomAttributes(typeof(MetadataTypeAttribute), false) .FirstOrDefault() as MetadataTypeAttribute; IDictionary<string, object> htmlAttr = null; if(metadataTypeAttr != null) { var stringLength = metadataTypeAttr.MetadataClassType .GetProperty(member.Member.Name) .GetCustomAttributes(typeof(StringLengthAttribute), false) .FirstOrDefault() as StringLengthAttribute; if (stringLength != null) { htmlAttr = new RouteValueDictionary(htmlAttributes); htmlAttr.Add("maxlength", stringLength.MaximumLength); } } return htmlHelper.TextBoxFor(expression, htmlAttr); } </code></pre> <hr> <p><em>Example class</em>:</p> <pre><code>[MetadataType(typeof(Person.Metadata))] public partial class Person { public sealed class Metadata { [DisplayName("First Name")] [StringLength(30, ErrorMessage = "Field [First Name] cannot exceed 30 characters")] [Required(ErrorMessage = "Field [First Name] is required")] public object FirstName { get; set; } /* ... */ } } </code></pre>

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