/// <summary>
/// Gets the value of the attribute with the specified local name and namespace URI.
/// </summary>
/// <typeparam name="T">Generic type parameter.</typeparam>
/// <param name="xelem">The element to act on.</param>
/// <param name="attrLocalName">Name of the attribute local.</param>
/// <param name="transformer">The transformer to/from T object.</param>
/// <param name="defaultValue">The default value.</param>
/// <returns>
/// The attribute's value as a string.
/// </returns>
/// <exception cref="ArgumentNullException">Thrown when one or more required arguments are null.</exception>
public static T Get <T>(this XElement xelem, string attrLocalName, IAttributeValueTransformer <T> transformer, T defaultValue)
{
if (transformer == null)
{
throw new ArgumentNullException(nameof(transformer));
}
return(xelem.HasAttribute(attrLocalName) ? transformer.ConvertFrom(xelem.Get(attrLocalName)) : defaultValue);
}
/// <summary>
/// Sets the value of attribute with the specified local name within the specified namespace.
/// </summary>
/// <typeparam name="T">Generic type parameter.</typeparam>
/// <param name="xelem">This <see cref="XmlElement"/> node to act on.</param>
/// <param name="localName">The local name of the new element.</param>
/// <param name="ns">The namespace.</param>
/// <param name="value">The string value.</param>
/// <param name="transformer">The transformer.</param>
/// <exception cref="ArgumentNullException">Thrown when one or more required arguments are null.</exception>
public static void PutAttribute <T>(this XElement xelem, string localName, XNamespace ns, T value, IAttributeValueTransformer <T> transformer)
{
if (transformer == null)
{
throw new ArgumentNullException(nameof(transformer));
}
xelem.SetAttributeValue(ns + localName, transformer.ToString(value));
}
/// <summary>
/// Gets the value of the attribute with the specified local name and namespace.
/// </summary>
/// <typeparam name="T">Generic type parameter.</typeparam>
/// <param name="xelem">The element to act on.</param>
/// <param name="attrLocalName">Name of the attribute local.</param>
/// <param name="ns">The namespace.</param>
/// <param name="transformer">The transformer to/from T object.</param>
/// <returns>
/// The attribute's value as a string.
/// </returns>
/// <exception cref="ArgumentNullException">Thrown when one or more required arguments are null.</exception>
public static T Get <T>(this XElement xelem, string attrLocalName, XNamespace ns, IAttributeValueTransformer <T> transformer)
{
if (transformer == null)
{
throw new ArgumentNullException(nameof(transformer));
}
return(transformer.ConvertFrom(xelem.Get(attrLocalName, ns)));
}
