/// <summary>
/// Converts the specified <paramref name="obj"/> to a collection.
/// If the object supports the interface <see cref="ICollection"/> itself,
/// it will simply be casted. If it is an <see cref="IEnumerable"/>, its contents
/// will be copied into a new object implementing <see cref="ICollection"/>.
/// Else, a new <see cref="ICollection"/> will be created with <paramref name="obj"/>
/// as single contents.
/// A string won't be treated as a collection of characters but will be treated as if
/// it was no collection.
/// </summary>
/// <param name="obj">The object to convert to a collection.</param>
/// <param name="entryType">Type to convert the collection entries to or <c>null</c>.</param>
/// <param name="result">Collection containing the contents of obj or obj itself.</param>
/// <returns><c>true</c>, if the conversion was successful, else <c>false</c>.</returns>
protected static bool ToCollection(object obj, Type entryType, out ICollection result)
{
obj = ParserHelper.UnwrapIncludesAndCleanup(obj);
if (obj.GetType() != typeof(string)) // Don't treat strings as a collection of characters
{
if (obj is ICollection)
{
return(ConvertEntryType((ICollection)obj, entryType, out result));
}
if (obj is IEnumerable)
{
List <object> col = ((IEnumerable)obj).Cast <object>().ToList();
return(ConvertEntryType(col, entryType, out result));
}
}
List <object> res = new List <object>();
object o2;
if (entryType == null)
{
res.Add(obj);
}
else if (Convert(obj, entryType, out o2))
{
res.Add(o2);
}
else
{
result = null;
return(false);
}
result = res;
return(true);
}
/// <summary>
/// Parses the XAML file associated with this parser.
/// </summary>
/// <returns>The visual corresponding to the root XAML element.</returns>
public object Parse()
{
if (_rootObject != null)
{
throw new XamlParserException("XAML Parser: Parse() method was invoked multiple times");
}
object key;
_rootObject = ParserHelper.UnwrapIncludesAndCleanup(Instantiate(_xmlDocument.DocumentElement, out key));
if (key != null)
{
throw new XamlParserException("A 'x:Key' attribute is not allowed at the XAML root element");
}
foreach (EvaluatableMarkupExtensionActivator activator in _deferredMarkupExtensionActivations)
{
activator.Activate();
}
return(_rootObject);
}
/// <summary>
/// Parses the contents of an <see cref="XmlNode"/> (not the node itself!).
/// Parsed will be instances of <see cref="XmlAttribute"/> and <see cref="XmlElement"/>.
/// In case the node is an <see cref="XmlAttribute"/>, its value will be parsed
/// and returned. This will normally be a string or an instance of a
/// markup extension. In case the node is an <see cref="XmlElement"/>,
/// its children will be instantiatedan returned as an <see cref="IList"/> or
/// an <see cref="IDictionary"/>, depending on whether the elements have a
/// <c>x:Key</c> attribute associated.
/// </summary>
/// <param name="node">The XML node, an <see cref="XmlAttribute"/> or
/// an <see cref="XmlElement"/>, whose contents should be parsed.</param>
/// <returns>Parsed value. This is either a string, a markup extension
/// instance, an <c>IList<object></c> or an <c>IDictionary<object, object></c>.</returns>
protected object ParseValue(XmlNode node)
{
if (node is XmlAttribute) // Member attribute
{
return(ParseValue(node.Value));
}
if (!(node is XmlElement))
{
return(null);
}
// Handle explicit or implicit (Content) member element
// Return value's type will be either a dict or a list, depending on contents
IList <object> resultList = new List <object>();
IDictionary <object, object> resultDict = new Dictionary <object, object>();
foreach (XmlNode childNode in node.ChildNodes)
{
if (childNode is XmlElement)
{
if (childNode.LocalName.IndexOf('.') != -1) // "." is used as indicator that we have a member declaration
// Ignore member assignments here - we focus on our real children
{
continue;
}
object key;
object value = Instantiate((XmlElement)childNode, out key);
if (key == null)
{
key = GetImplicitKey(value);
}
IEvaluableMarkupExtension evaluableMarkupExtension = value as IEvaluableMarkupExtension;
// Handle the case if a markup extension was instantiated as a child
if (evaluableMarkupExtension != null)
{
evaluableMarkupExtension.Initialize(this);
if (!evaluableMarkupExtension.Evaluate(out value))
{
throw new XamlParserException("Could not evaluate markup extension '{0}'", evaluableMarkupExtension);
}
}
value = ParserHelper.UnwrapIncludesAndCleanup(value);
if (key == null)
{
resultList.Add(value);
}
else
{
try
{
resultDict.Add(key, value);
}
catch (ArgumentException e)
{
throw new XamlParserException("Duplicate key '{0}'", e, key);
}
}
// If a key was provided, register the new element in the current context.
// This is necessary if the new element should be accessed before all children
// here created are added to their target collection.
if (key != null)
{
_elementContextStack.CurrentElementContext.AddKeyedElement(key, value);
}
}
else if (childNode is XmlText || childNode is XmlCDataSection) // Ignore other XmlCharacterData nodes
{
resultList.Add(((XmlCharacterData)childNode).Data);
}
}
if (resultList.Count > 0 && resultDict.Count > 0)
{
throw new XamlBindingException(
"Xaml parser parsing Element '{0}': Child elements containing x:Key attributes cannot be mixed with child elements without x:Key attribute",
node.Name);
}
if (resultDict.Count > 0)
{
return(resultDict);
}
return(resultList.Count == 0 ? null : (resultList.Count == 1 ? resultList[0] : resultList));
}
