public static class HtmlHelperExtensions
{
    public static MvcHtmlString EditorForMany<TModel, TValue>(this HtmlHelper<TModel> html, Expression<Func<TModel, IEnumerable<TValue>>> expression, string templateName = null, object data = null) where TModel : class
    {
        StringBuilder sb = new StringBuilder();

        // Get the items from ViewData
        var items = expression.Compile()(html.ViewData.Model);
        var fieldName = ExpressionHelper.GetExpressionText(expression);
        //var htmlFieldPrefix = html.ViewContext.ViewData.TemplateInfo.HtmlFieldPrefix;
        //var fullHtmlFieldPrefix = String.IsNullOrEmpty(htmlFieldPrefix) ? fieldName : String.Format("{0}.{1}", htmlFieldPrefix, fieldName);
        int index = 0;

        foreach (TValue item in items)
        {
            // Much gratitude to Matt Hidinger for getting the singleItemExpression.
            // Current html.DisplayFor() throws exception if the expression is anything that isn't a "MemberAccessExpression"
            // So we have to trick it and place the item into a dummy wrapper and access the item through a Property
            var dummy = new { Item = item };

            // Get the actual item by accessing the "Item" property from our dummy class
            var memberExpression = Expression.MakeMemberAccess(Expression.Constant(dummy), dummy.GetType().GetProperty("Item"));

            // Create a lambda expression passing the MemberExpression to access the "Item" property and the expression params
            var singleItemExpression = Expression.Lambda<Func<TModel, TValue>>(memberExpression,
                                                                                expression.Parameters);

            // Now when the form collection is submitted, the default model binder will be able to bind it exactly as it was.
            //var itemFieldName = String.Format("{0}[{1}]", fullHtmlFieldPrefix, index++);
            var itemFieldName = String.Format("{0}[{1}]", fieldName, index++);
            string singleItemHtml = html.EditorFor(singleItemExpression, templateName, itemFieldName, data).ToString();
            sb.AppendFormat(singleItemHtml);
        }

        return new MvcHtmlString(sb.ToString());
    }
}