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

            private IList GetWrappedExtenders(IExtenderProvider provider) {
                Debug.WriteLineIf(CompDescrSwitch.TraceVerbose, "GetWrappedExtenders");
                if (wrappedExtenderTable == null) {
                    wrappedExtenderTable = new Hashtable();
                }

                if (provider == null) {
                    return null;
                }

                Type providerType = ((object)provider).GetType();
                if (!componentType.IsAssignableFrom(providerType)) {
                    throw new ArgumentException(SR.GetString(SR.ErrorBadExtenderType, providerType.Name, componentType.Name), "provider");
                }

                bool sitedProvider = false;

                if (provider is IComponent && ((IComponent)provider).Site != null) {
                    sitedProvider = true;
                }

                IList wrappedExtenders = null;
                
                lock(this) {
                    wrappedExtenders = (IList) wrappedExtenderTable[provider];
                    
                    if (wrappedExtenders == null) {
                        Debug.WriteLineIf(CompDescrSwitch.TraceVerbose, "\tentry not found in table... creating");
                        IList extenders = GetExtenders();
                        Debug.WriteLineIf(CompDescrSwitch.TraceVerbose, "\tfound " + extenders.Count.ToString(CultureInfo.InvariantCulture) + " extenders");
                        wrappedExtenders = new ArrayList(extenders.Count);
                        for (int i = 0; i < extenders.Count; i++) {
                            DebugReflectPropertyDescriptor ex = (DebugReflectPropertyDescriptor)extenders[i];
                            Attribute[] attrs = null;
    
                            // If the extender provider is not a sited component, then mark all
                            // of its properties as design time only, since there is no way we
                            // can persist them.  We can assume this because this is only called if
                            // we could get the extender provider list from a component site.
                            //
                            if (!sitedProvider) {
                                attrs = new Attribute[] {DesignOnlyAttribute.Yes};
                            }
    
                            wrappedExtenders.Add(new DebugExtendedPropertyDescriptor(ex, ex.ExtenderGetReceiverType(), provider, attrs));
                        }
                        wrappedExtenderTable[provider] = wrappedExtenders;
                    }
                    else {
                        Debug.WriteLineIf(CompDescrSwitch.TraceVerbose, "\tentry found in table...");
                    }
                }

                return wrappedExtenders;
            }