XElementHelper Safely read and cast values provided through the System.Xml.Linq.XElement

gistfile1.txt

namespace DetangledDigital.Services.Helpers
{
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Xml.Linq;

    // @CGASKELL: Some XElement helpers to assist with safely reading XML
    public static class XElementHelper
    {
        public static T ChildNodeValue<T>(this XElement element, string nodeName)
        {
            if (element == null || element.Element(nodeName) == null || string.IsNullOrWhiteSpace(element.Element(nodeName).Value))
                return default(T);

            return (T)Convert.ChangeType(element.Element(nodeName).Value, typeof(T));
        }

        public static List<int> ChildNodeValueAsListOfIntegers(this XElement element, string nodeName)
        {
            if (element == null || element.Element(nodeName) == null || string.IsNullOrWhiteSpace(element.Element(nodeName).Value))
                return new List<int>();

            var stringArray = element.Element(nodeName).Value.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
            if (!stringArray.Any())
                return new List<int>();

            int parsed = 0;
            return stringArray.Where(x => int.TryParse(x, out parsed)).Select(x => parsed).ToList();
        }

        public static T AttributeValue<T>(this XElement element, string attributeName)
        {
            if (element == null || element.Attribute(attributeName) == null)
                return default(T);

            return (T)Convert.ChangeType(element.Attribute(attributeName).Value, typeof(T));
        }
    }
}