System.ComponentModel.DebugTypeDescriptor.ComponentEntry.FilterProperties C# (CSharp) Method

           internal PropertyDescriptorCollection FilterProperties(object component, Attribute[] attributes, PropertyDescriptorCollection properties) {
               PropertyDescriptorCollection filteredProperties = properties;
            
               ArrayList allProps = null;

                if (component is IComponent) {
                    ITypeDescriptorFilterService tf = (ITypeDescriptorFilterService)GetService(component, typeof(ITypeDescriptorFilterService));
                    
                    if (tf != null) {
                        Hashtable filterTable = new Hashtable(properties.Count);

                        foreach(PropertyDescriptor p in properties) {
                            string suffix = GetExtenderCollisionSuffix(p);
                            if (suffix == null)
                                suffix = "";

                            Debug.Assert(!filterTable.Contains(p.Name + suffix), "Overwriting PropertyDescriptor during filtering!!! " + p.Name + suffix);
                            filterTable[p.Name + suffix] = p;
                        }
                        
                        tf.FilterProperties((IComponent)component, filterTable);
                        allProps = new ArrayList(filterTable.Values);
                    }
                }
            
                if (attributes != null && attributes.Length > 0) {
                    if (allProps == null) {
                        allProps = new ArrayList(properties);
                    }
                    FilterMembers(typeof(PropertyDescriptor), allProps, attributes);
                }
                
                if (allProps != null) {
                    PropertyDescriptor[] temp = new PropertyDescriptor[allProps.Count];
                    allProps.CopyTo(temp, 0);
                    filteredProperties = new PropertyDescriptorCollection(temp, true);
                }
                
                return filteredProperties;
            }