XmlExtensions.cs

using System;
using System.Xml.Linq;

namespace GitMerger
{
    public static class XmlExtensions
    {
        public static string AttributeValue(this XElement element, XName name)
        {
            if (element == null)
                throw new ArgumentNullException(nameof(element), $"{nameof(element)} is null.");
            var attribute = element.Attribute(name);
            return attribute?.Value ?? string.Empty;
        }
        public static XElement ElementPath(this XElement element, params XName[] names)
        {
            if (element == null)
                throw new ArgumentNullException(nameof(element), $"{nameof(element)} is null.");
            foreach (XName name in names)
            {
                element = element.Element(name);
                if (element == null)
                    break;
            }
            return element;
        }
        public static string ElementValue(this XElement element, params XName[] names)
        {
            var targetElement = element.ElementPath(names);
            return targetElement?.Value ?? string.Empty;
        }
        public static string ElementValue(this XElement element, XName name)
        {
            var targetElement = element.Element(name);
            return targetElement?.Value ?? string.Empty;
        }
    }
}