/// <summary>
/// Loads the optional elements of this <see cref="RssChannel"/> using the supplied <see cref="XPathNavigator"/>.
/// </summary>
/// <param name="source">The <see cref="XPathNavigator"/> to extract information from.</param>
/// <param name="manager">The <see cref="XmlNamespaceManager"/> used to resolve namespace prefixes.</param>
/// <param name="settings">The <see cref="SyndicationResourceLoadSettings"/> used to configure the load operation.</param>
/// <returns><b>true</b> if the <see cref="RssChannel"/> was initialized using the supplied <paramref name="source"/>, otherwise <b>false</b>.</returns>
/// <remarks>
/// This method expects the supplied <paramref name="source"/> to be positioned on the XML element that represents a <see cref="RssChannel"/>.
/// </remarks>
/// <exception cref="ArgumentNullException">The <paramref name="source"/> is a null reference (Nothing in Visual Basic).</exception>
/// <exception cref="ArgumentNullException">The <paramref name="manager"/> is a null reference (Nothing in Visual Basic).</exception>
private bool LoadOptionals(XPathNavigator source, XmlNamespaceManager manager, SyndicationResourceLoadSettings settings)
{
//------------------------------------------------------------
// Local members
//------------------------------------------------------------
bool wasLoaded = false;
//------------------------------------------------------------
// Validate parameter
//------------------------------------------------------------
Guard.ArgumentNotNull(source, "source");
Guard.ArgumentNotNull(manager, "manager");
Guard.ArgumentNotNull(settings, "settings");
//------------------------------------------------------------
// Attempt to extract syndication information
//------------------------------------------------------------
XPathNavigator cloudNavigator = source.SelectSingleNode("cloud", manager);
XPathNavigator copyrightNavigator = source.SelectSingleNode("copyright", manager);
XPathNavigator generatorNavigator = source.SelectSingleNode("generator", manager);
XPathNavigator imageNavigator = source.SelectSingleNode("image", manager);
XPathNavigator languageNavigator = source.SelectSingleNode("language", manager);
XPathNavigator lastBuildDateNavigator = source.SelectSingleNode("lastBuildDate", manager);
XPathNavigator managingEditorNavigator = source.SelectSingleNode("managingEditor", manager);
XPathNavigator publicationNavigator = source.SelectSingleNode("pubDate", manager);
XPathNavigator ratingNavigator = source.SelectSingleNode("rating", manager);
XPathNavigator textInputNavigator = source.SelectSingleNode("textInput", manager);
XPathNavigator timeToLiveNavigator = source.SelectSingleNode("ttl", manager);
XPathNavigator webMasterNavigator = source.SelectSingleNode("webMaster", manager);
if (cloudNavigator != null)
{
RssCloud cloud = new RssCloud();
if (cloud.Load(cloudNavigator, settings))
{
this.Cloud = cloud;
wasLoaded = true;
}
}
if (copyrightNavigator != null)
{
this.Copyright = copyrightNavigator.Value;
wasLoaded = true;
}
if (generatorNavigator != null)
{
this.Generator = generatorNavigator.Value;
wasLoaded = true;
}
if (imageNavigator != null)
{
RssImage image = new RssImage();
if (image.Load(imageNavigator, settings))
{
this.Image = image;
wasLoaded = true;
}
}
if (languageNavigator != null && !String.IsNullOrEmpty(languageNavigator.Value))
{
try
{
CultureInfo language = new CultureInfo(languageNavigator.Value);
this.Language = language;
wasLoaded = true;
}
catch (ArgumentException)
{
System.Diagnostics.Trace.TraceWarning("RssChannel unable to determine CultureInfo with a name of {0}.", languageNavigator.Value);
}
}
if (lastBuildDateNavigator != null)
{
DateTime lastBuildDate;
if (SyndicationDateTimeUtility.TryParseRfc822DateTime(lastBuildDateNavigator.Value, out lastBuildDate))
{
this.LastBuildDate = lastBuildDate;
wasLoaded = true;
}
}
if (managingEditorNavigator != null)
{
this.ManagingEditor = managingEditorNavigator.Value;
wasLoaded = true;
}
if (publicationNavigator != null)
{
DateTime publicationDate;
if (SyndicationDateTimeUtility.TryParseRfc822DateTime(publicationNavigator.Value, out publicationDate))
{
this.PublicationDate = publicationDate;
wasLoaded = true;
}
}
if (ratingNavigator != null)
{
this.Rating = ratingNavigator.Value;
wasLoaded = true;
}
if (textInputNavigator != null)
{
RssTextInput textInput = new RssTextInput();
if (textInput.Load(textInputNavigator, settings))
{
this.TextInput = textInput;
wasLoaded = true;
}
}
if (timeToLiveNavigator != null)
{
int timeToLive;
if (Int32.TryParse(timeToLiveNavigator.Value, NumberStyles.Integer, NumberFormatInfo.InvariantInfo, out timeToLive))
{
this.TimeToLive = timeToLive;
wasLoaded = true;
}
}
if (webMasterNavigator != null)
{
this.Webmaster = webMasterNavigator.Value;
wasLoaded = true;
}
return wasLoaded;
}
