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);
}
