System.ComponentModel.DebugReflectPropertyDescriptor.ExtenderSetValue C# (CSharp) Method

        internal void ExtenderSetValue(IExtenderProvider provider, object component, object value, PropertyDescriptor notifyDesc) {
            if (provider != null) {

                ISite site = GetSite(component);
                IComponentChangeService changeService = null;
                object oldValue = null;

                // Announce that we are about to change this component
                //
                if (site != null) {
                    changeService = (IComponentChangeService)site.GetService(typeof(IComponentChangeService));
                    Debug.Assert(!CompModSwitches.CommonDesignerServices.Enabled || changeService != null, "IComponentChangeService not found");
                }

                // Make sure that it is ok to send the onchange events
                //
                if (changeService != null) {
                    oldValue = ExtenderGetValue(provider, component);
                    try {
                        changeService.OnComponentChanging(component, notifyDesc);
                    }
                    catch (CheckoutException coEx) {
                        if (coEx == CheckoutException.Canceled) {
                            return;
                        }
                        throw coEx;
                    }
                }

                provider = (IExtenderProvider)GetDebugInvokee(componentClass, provider);

                if (SetMethodValue != null) {
                    SetMethodValue.Invoke(provider, new object[] { component, value});

                    // Now notify the change service that the change was successful.
                    //
                    if (changeService != null) {
                        changeService.OnComponentChanged(component, notifyDesc, oldValue, value);
                    }
                }
            }
        }