OpenTween.Twitter.CreateEventFromJson C# (CSharp) Method

        private void CreateEventFromJson(string content)
        {
            TwitterStreamEvent eventData = null;
            try
            {
                eventData = TwitterStreamEvent.ParseJson(content);
            }
            catch(SerializationException ex)
            {
                MyCommon.TraceOut(ex, "Event Serialize Exception!" + Environment.NewLine + content);
            }
            catch(Exception ex)
            {
                MyCommon.TraceOut(ex, "Event Exception!" + Environment.NewLine + content);
            }

            var evt = new FormattedEvent();
            evt.CreatedAt = MyCommon.DateTimeParse(eventData.CreatedAt);
            evt.Event = eventData.Event;
            evt.Username = eventData.Source.ScreenName;
            evt.IsMe = evt.Username.ToLowerInvariant().Equals(this.Username.ToLowerInvariant());

            MyCommon.EVENTTYPE eventType;
            eventTable.TryGetValue(eventData.Event, out eventType);
            evt.Eventtype = eventType;

            TwitterStreamEvent<TwitterStatusCompat> tweetEvent;
            TwitterStatus tweet;

            switch (eventData.Event)
            {
                case "access_revoked":
                case "access_unrevoked":
                case "user_delete":
                case "user_suspend":
                    return;
                case "follow":
                    if (eventData.Target.ScreenName.ToLowerInvariant().Equals(_uname))
                    {
                        if (!this.followerId.Contains(eventData.Source.Id)) this.followerId.Add(eventData.Source.Id);
                    }
                    else
                    {
                        return;    //Block後のUndoをすると、SourceとTargetが逆転したfollowイベントが帰ってくるため。
                    }
                    evt.Target = "";
                    break;
                case "unfollow":
                    evt.Target = "@" + eventData.Target.ScreenName;
                    break;
                case "favorited_retweet":
                case "retweeted_retweet":
                    return;
                case "favorite":
                case "unfavorite":
                    tweetEvent = TwitterStreamEvent<TwitterStatusCompat>.ParseJson(content);
                    tweet = tweetEvent.TargetObject.Normalize();
                    evt.Target = "@" + tweet.User.ScreenName + ":" + WebUtility.HtmlDecode(tweet.FullText);
                    evt.Id = tweet.Id;

                    if (SettingCommon.Instance.IsRemoveSameEvent)
                    {
                        if (this.StoredEvent.Any(ev => ev.Username == evt.Username && ev.Eventtype == evt.Eventtype && ev.Target == evt.Target))
                            return;
                    }

                    var tabinfo = TabInformations.GetInstance();

                    PostClass post;
                    var statusId = tweet.Id;
                    if (!tabinfo.Posts.TryGetValue(statusId, out post))
                        break;

                    if (eventData.Event == "favorite")
                    {
                        var favTab = tabinfo.GetTabByType(MyCommon.TabUsageType.Favorites);
                        favTab.AddPostQueue(post);

                        if (tweetEvent.Source.Id == this.UserId)
                        {
                            post.IsFav = true;
                        }
                        else if (tweetEvent.Target.Id == this.UserId)
                        {
                            post.FavoritedCount++;

                            if (SettingCommon.Instance.FavEventUnread)
                                tabinfo.SetReadAllTab(post.StatusId, read: false);
                        }
                    }
                    else // unfavorite
                    {
                        if (tweetEvent.Source.Id == this.UserId)
                        {
                            post.IsFav = false;
                        }
                        else if (tweetEvent.Target.Id == this.UserId)
                        {
                            post.FavoritedCount = Math.Max(0, post.FavoritedCount - 1);
                        }
                    }
                    break;
                case "quoted_tweet":
                    if (evt.IsMe) return;

                    tweetEvent = TwitterStreamEvent<TwitterStatusCompat>.ParseJson(content);
                    tweet = tweetEvent.TargetObject.Normalize();
                    evt.Target = "@" + tweet.User.ScreenName + ":" + WebUtility.HtmlDecode(tweet.FullText);
                    evt.Id = tweet.Id;

                    if (SettingCommon.Instance.IsRemoveSameEvent)
                    {
                        if (this.StoredEvent.Any(ev => ev.Username == evt.Username && ev.Eventtype == evt.Eventtype && ev.Target == evt.Target))
                            return;
                    }
                    break;
                case "list_member_added":
                case "list_member_removed":
                case "list_created":
                case "list_destroyed":
                case "list_updated":
                case "list_user_subscribed":
                case "list_user_unsubscribed":
                    var listEvent = TwitterStreamEvent<TwitterList>.ParseJson(content);
                    evt.Target = listEvent.TargetObject.FullName;
                    break;
                case "block":
                    if (!TabInformations.GetInstance().BlockIds.Contains(eventData.Target.Id)) TabInformations.GetInstance().BlockIds.Add(eventData.Target.Id);
                    evt.Target = "";
                    break;
                case "unblock":
                    if (TabInformations.GetInstance().BlockIds.Contains(eventData.Target.Id)) TabInformations.GetInstance().BlockIds.Remove(eventData.Target.Id);
                    evt.Target = "";
                    break;
                case "user_update":
                    evt.Target = "";
                    break;
                
                // Mute / Unmute
                case "mute":
                    evt.Target = "@" + eventData.Target.ScreenName;
                    if (!TabInformations.GetInstance().MuteUserIds.Contains(eventData.Target.Id))
                    {
                        TabInformations.GetInstance().MuteUserIds.Add(eventData.Target.Id);
                    }
                    break;
                case "unmute":
                    evt.Target = "@" + eventData.Target.ScreenName;
                    if (TabInformations.GetInstance().MuteUserIds.Contains(eventData.Target.Id))
                    {
                        TabInformations.GetInstance().MuteUserIds.Remove(eventData.Target.Id);
                    }
                    break;

                default:
                    MyCommon.TraceOut("Unknown Event:" + evt.Event + Environment.NewLine + content);
                    break;
            }
            this.StoredEvent.Insert(0, evt);

            this.UserStreamEventReceived?.Invoke(this, new UserStreamEventReceivedEventArgs(evt));
        }