private void RegisterEvent()

in src/BehaviorsSDKManaged/Microsoft.Xaml.Interactions/Core/EventTriggerBehavior.cs [135:176]
38 lines of code
8 McCabe index (conditional complexity)

        private void RegisterEvent(string eventName)
        {
            if (string.IsNullOrEmpty(eventName))
            {
                return;
            }

            if (eventName != "Loaded")
            {
                Type sourceObjectType = this._resolvedSource.GetType();
                EventInfo info = sourceObjectType.GetRuntimeEvent(eventName);
                if (info == null)
                {
                    return;
                }

                MethodInfo methodInfo = typeof(EventTriggerBehavior).GetTypeInfo().GetDeclaredMethod("OnEvent");
                this._eventHandler = methodInfo.CreateDelegate(info.EventHandlerType, this);

                this._isWindowsRuntimeEvent = EventTriggerBehavior.IsWindowsRuntimeEvent(info);
                if (this._isWindowsRuntimeEvent)
                {
                    this._addEventHandlerMethod = add => (EventRegistrationToken)info.AddMethod.Invoke(this._resolvedSource, new object[] { add });
                    this._removeEventHandlerMethod = token => info.RemoveMethod.Invoke(this._resolvedSource, new object[] { token });

                    WindowsRuntimeMarshal.AddEventHandler(this._addEventHandlerMethod, this._removeEventHandlerMethod, this._eventHandler);
                }
                else
                {
                    info.AddEventHandler(this._resolvedSource, this._eventHandler);
                }
            }
            else if (!this._isLoadedEventRegistered)
            {
                FrameworkElement element = this._resolvedSource as FrameworkElement;
                if (element != null && !EventTriggerBehavior.IsElementLoaded(element))
                {
                    this._isLoadedEventRegistered = true;
                    element.Loaded += this.OnEvent;
                }
            }
        }