public bool Evaluate(IDataDescriptor source, out IDataDescriptor result)
{
result = null;
object value = source.Value;
if (value == null)
{
return(false);
}
ParameterInfo[] indexerParams = IndexerDataDescriptor.GetIndexerTypes(value.GetType());
object[] convertedIndices;
// Search indexer on source type
if (indexerParams != null && ReflectionHelper.ConsumeParameters(_indices,
indexerParams, false, out convertedIndices))
{ // Index on Item property
result = new IndexerDataDescriptor(value, convertedIndices);
return(true);
}
if (ReflectionHelper.ConvertTypes(_indices, new Type[] { typeof(int) },
out convertedIndices))
{ // Collection index
if (!ReflectionHelper.GetEnumerationEntryByIndex(value, (int)convertedIndices[0], out result))
{
throw new XamlBindingException("Index '{0}' cannot be applied on '{1}'",
ToString(), value);
}
return(true);
}
return(false);
}
public bool Evaluate(IDataDescriptor source, out IDataDescriptor result)
{
result = null;
Type type;
object obj;
MemberInfo mi;
if (!ExtractWorkingData(source, _memberName + "Property", out type, out obj, out mi))
{
if (!ExtractWorkingData(source, _memberName, out type, out obj, out mi))
{
return(false);
}
}
if (mi is FieldInfo)
{ // Field access
result = new FieldDataDescriptor(obj, (FieldInfo)mi);
return(true);
}
if (mi is PropertyInfo)
{ // Property access
PropertyInfo pi = (PropertyInfo)mi;
// Handle indexed property
object[] convertedIndices = null;
// Check property indexer
bool indicesOnProperty = _indices != null && _indices.Length > 0 &&
ReflectionHelper.ConsumeParameters(_indices, pi.GetIndexParameters(),
false, out convertedIndices);
if (!indicesOnProperty)
{
convertedIndices = null;
}
if (pi.PropertyType == typeof(AbstractProperty))
{ // Property value -> request value and return DependencyPropertyDataDescriptor
object val = pi.GetValue(obj, convertedIndices);
if (val == null)
{
return(false);
}
result = new DependencyPropertyDataDescriptor(obj, _memberName, (AbstractProperty)val);
}
else
{ // Simple property
result = new SimplePropertyDataDescriptor(obj, pi);
if (convertedIndices != null && convertedIndices.Length > 0)
{
((SimplePropertyDataDescriptor)result).Indices = convertedIndices;
}
}
if (_indices != null && _indices.Length > 0 && !indicesOnProperty)
{
// Item or collection index -> handle index expression per IndexerPathSegment
return(new IndexerPathSegment(_indices).Evaluate(result, out result));
}
return(true);
}
if (mi is MethodInfo)
{
// Method invocation is not supported in evaluation
return(false);
}
// Unsupported member type
return(false);
}
