public override PropertyDescriptorCollection GetProperties(Attribute[] attributes)
{
// Retrieve cached properties and filtered properties
bool filtering = attributes != null && attributes.Length > 0;
FilterCache <PropertyDescriptorCollection> propertyCache = TypeDescriptionProvider._filterPropertyCache;
PropertyDescriptorCollection propertyDescriptorCollection = TypeDescriptionProvider._propertyCache;
// Use a cached version if we can
if (filtering && propertyCache != null && propertyCache.IsValid(attributes))
{
return(propertyCache.FilteredMembers);
}
else if (!filtering && propertyDescriptorCollection != null)
{
return(propertyDescriptorCollection);
}
// Otherwise, create the property collection
propertyDescriptorCollection = new PropertyDescriptorCollection(null);
foreach (PropertyDescriptor prop in base.GetProperties(attributes))
{
propertyDescriptorCollection.Add(prop);
}
foreach (FieldInfo field in ObjectType.GetFields())
{
ChoConfigurationFieldPropertyDescriptor fieldDesc = new ChoConfigurationFieldPropertyDescriptor(field);
if (!filtering || fieldDesc.Attributes.Contains(attributes))
{
propertyDescriptorCollection.Add(fieldDesc);
}
}
// Store the updated properties
if (filtering)
{
propertyCache = new FilterCache <PropertyDescriptorCollection>();
propertyCache.FilteredMembers = propertyDescriptorCollection;
propertyCache.Attributes = attributes;
TypeDescriptionProvider._filterPropertyCache = propertyCache;
}
else
{
TypeDescriptionProvider._propertyCache = propertyDescriptorCollection;
}
// Return the computed properties
return(propertyDescriptorCollection);
}
public override bool Equals(object obj)
{
ChoConfigurationFieldPropertyDescriptor other = obj as ChoConfigurationFieldPropertyDescriptor;
return(other != null && other._field.Equals(_field));
}