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Faire le ‘cast’ de la valeur d’un attribut lu à partir d’un ‘XmlElemen’


  License:  Microsoft Permissive License (Ms-PL) v1.1
using System;
using System.Xml;
namespace ValidationFramework.Extensions
    public static class XmlElementExtensions
        /// Attempts to get and cast attribute from a <see cref="XmlElement"/>. If the item does not exist or can't be casted exceptions are thrown.
        /// </summary>
        /// <typeparam name="T">The <see cref="Type"/> to try to convert to.</typeparam>
<param name="element">The <see cref="XmlElement"/> to extract the attribute value from.</param>
<param name="key">The key to use or the extraction</param>
<param name="defaultValue">The default value if
<paramref name="key"/> is not found.</param>
        /// <returns>The value from
<paramref name="attributes"/> if
<paramref name="key"/> exists; otherwise
<paramref name="defaultValue"/>.</returns>
        /// <exception cref="ArgumentOutOfRangeException"></exception>
        internal static T GetAttribute<T>(this XmlElement element, string key)
            if (!element.HasAttribute(key))
                throw new ArgumentOutOfRangeException(string.Format("The key '{0}' cannot be found in xml element.", key));
            var stringValue = element.GetAttribute(key);
            var converter = System.ComponentModel.TypeDescriptor.GetConverter(typeof(T));
            return (T)converter.ConvertFromString(stringValue);

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