/// <summary>Gets a per-object cache, accessed as an <see cref="T:System.Collections.IDictionary" /> of key/value pairs.</summary>
/// <returns>An <see cref="T:System.Collections.IDictionary" /> if the provided object supports caching; otherwise, null.</returns>
/// <param name="instance">The object for which to get the cache.</param>
public virtual IDictionary GetCache(object instance)
{
if (_parent != null)
{
return(_parent.GetCache(instance));
}
return(null);
}
/// <summary> /// TypeDescriptor may need to perform complex operations on collections of metadata. /// Since types are not unloaded for the life of a domain, TypeDescriptor will /// automatically cache the results of these operations based on type. There are a /// number of operations that use live object instances, however. These operations /// cannot be cached within TypeDescriptor because caching them would prevent the /// object from garbage collecting. Instead, TypeDescriptor allows for a per-object /// cache, accessed as an IDictionary of key/value pairs, to exist on an object. /// The GetCache method returns an instance of this cache. GetCache will return /// null if there is no supported cache for an object. /// </summary> public virtual IDictionary?GetCache(object instance) => _parent?.GetCache(instance);
