Umbraco DynamcNode Extensions

dncollab.cs

///
/// This is a first attempt to make some useful extension methods to dynamic node and dynamic node list
/// Comments and collab is more than welcome!
///
/// Ref (Gareth Evans):
/// http://umbraco.com/follow-us/blog-archive/2011/2/28/umbraco-razor-feature-walkthrough-%E2%80%93-part-3
///

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Text;
using umbraco.MacroEngines;

namespace dncollab
{
    public static class RazorExtensions
    {
        /// <summary>
        /// Return PropertyValue as DateTime, if property does not exist or
        /// is not a date the function will return DateTime.MinValue
        /// </summary>
        /// <param name="dn"></param>
        /// <param name="propertyName"></param>
        /// <returns></returns>
        public static DateTime PropertyAsDateTime(this DynamicNode dn, string propertyName)
        {
            var property = dn.GetProperty(propertyName);

            if (property==null) return DateTime.MinValue;

            DateTime dt = DateTime.MinValue;
            DateTime.TryParse(property.Value.ToString(), out dt);

            return dt;
        }
        /// <summary>
        /// Return PropertyValue as String, if property does not exist or
        /// is null the function will return empty string
        /// </summary>
        /// <param name="dn"></param>
        /// <param name="propertyName"></param>
        /// <returns></returns>
        public static string PropertyAsString(this DynamicNode dn, string propertyName)
        {
            var property = dn.GetProperty(propertyName);
            if (property == null) return "";
            return property.Value.ToString();
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="dn"></param>
        /// <param name="propertyName"></param>
        /// <returns></returns>
        public static bool PropertyNotEmpty(DynamicNode dn, string propertyName)
        {
            var property = dn.GetProperty(propertyName);
            return ((property!=null) && property.Value.ToString() != "");
        }
        /// <summary>
        /// Gets first AncestorOrSelf with a non empty property of name propertyName
        /// </summary>
        /// <param name="dn"></param>
        /// <param name="propertyName"></param>
        /// <returns></returns>
        public static DynamicNode AncestorOrSelfNotEmptyProperty(this DynamicNode dn, string propertyName)
        {

            dynamic n = dn;

            while (!PropertyNotEmpty(n, propertyName) && n.Parent != null) { n = n.Parent; }

            if (PropertyNotEmpty(n, propertyName))
                return n;
            else
                return null;
        }
        /// <summary>
        /// Gets property value recursively
        /// @{current = (umbraco.MacroEngines.DynamicNode)Model;}
        /// <h1>Site Name: @current.PropertyValueRecursive("siteName")</h1>
        /// 
        /// </summary>
        /// <param name="dn"></param>
        /// <param name="propertyName"></param>
        /// <returns></returns>
        public static string PropertyAsStringRecursive(this DynamicNode dn, string propertyName)
        {

            dynamic n = dn.AncestorOrSelfNotEmptyProperty(propertyName);

            if (n != null)
                return n.GetProperty(propertyName).Value.ToString();
            else
                return "";
        }
    }
}