PropertyDescriptorCollection ICustomTypeDescriptor.GetProperties(Attribute[] attributes)
{
bool filtering = (attributes != null && attributes.Length > 0);
PropertyDescriptorCollection props = _propCache;
FilterCache cache = _filterCache;
// Use a cached version if possible
if (filtering && cache != null && cache.IsValid(attributes))
{
return(cache.FilteredProperties);
}
else if (!filtering && props != null)
{
return(props);
}
// Create the property collection and filter
props = new PropertyDescriptorCollection(null);
foreach (PropertyDescriptor prop in TypeDescriptor.GetProperties(this, attributes, true))
{
props.Add(prop);
}
foreach (FieldInfo field in GetType().GetFields())
{
FieldPropertyDescriptor fieldDesc = new FieldPropertyDescriptor(field);
if (!filtering || fieldDesc.Attributes.Contains(attributes))
{
props.Add(fieldDesc);
}
}
// Store the computed properties
if (filtering)
{
cache = new FilterCache();
cache.Attributes = attributes;
cache.FilteredProperties = props;
_filterCache = cache;
}
else
{
_propCache = props;
}
return(props);
}
PropertyDescriptorCollection ICustomTypeDescriptor.GetProperties(Attribute[] attributes)
{
bool filtering = (attributes != null && attributes.Length > 0);
PropertyDescriptorCollection props = _propCache;
FilterCache cache = _filterCache;
// Use a cached version if possible
if (filtering && cache != null && cache.IsValid(attributes))
{
return cache.FilteredProperties;
}
else if (!filtering && props != null)
{
return props;
}
// Create the property collection and filter
props = new PropertyDescriptorCollection(null);
foreach (PropertyDescriptor prop in TypeDescriptor.GetProperties(this, attributes, true))
{
props.Add(prop);
}
foreach (FieldInfo field in GetType().GetFields())
{
FieldPropertyDescriptor fieldDesc = new FieldPropertyDescriptor(field);
if (!filtering || fieldDesc.Attributes.Contains(attributes)) props.Add(fieldDesc);
}
// Store the computed properties
if (filtering)
{
cache = new FilterCache();
cache.Attributes = attributes;
cache.FilteredProperties = props;
_filterCache = cache;
}
else _propCache = props;
return props;
}
public override bool Equals(object obj)
{
FieldPropertyDescriptor other = obj as FieldPropertyDescriptor;
return(other != null && other._field.Equals(_field));
}
