OpenTween.TweenMain.LoadIcons C# (CSharp) Method

        private void LoadIcons()
        {
            // Icons フォルダ以下のアイコンを読み込み（着せ替えアイコン対応）
            var iconsDir = Path.Combine(Application.StartupPath, "Icons");

            // ウィンドウ左上のアイコン
            var iconMain = this.LoadIcon(Path.Combine(iconsDir, "MIcon.ico"));

            // タブ見出し未読表示アイコン
            var iconTab = this.LoadIcon(Path.Combine(iconsDir, "Tab.ico"));

            // タスクトレイ: 通常時アイコン
            var iconAt = this.LoadIcon(Path.Combine(iconsDir, "At.ico"));

            // タスクトレイ: エラー時アイコン
            var iconAtRed = this.LoadIcon(Path.Combine(iconsDir, "AtRed.ico"));

            // タスクトレイ: オフライン時アイコン
            var iconAtSmoke = this.LoadIcon(Path.Combine(iconsDir, "AtSmoke.ico"));

            // タスクトレイ: Reply通知アイコン (最大2枚でアニメーション可能)
            var iconReply = this.LoadIcon(Path.Combine(iconsDir, "Reply.ico"));
            var iconReplyBlink = this.LoadIcon(Path.Combine(iconsDir, "ReplyBlink.ico"));

            // タスクトレイ: 更新中アイコン (最大4枚でアニメーション可能)
            var iconRefresh1 = this.LoadIcon(Path.Combine(iconsDir, "Refresh.ico"));
            var iconRefresh2 = this.LoadIcon(Path.Combine(iconsDir, "Refresh2.ico"));
            var iconRefresh3 = this.LoadIcon(Path.Combine(iconsDir, "Refresh3.ico"));
            var iconRefresh4 = this.LoadIcon(Path.Combine(iconsDir, "Refresh4.ico"));

            // 読み込んだアイコンを設定 (不足するアイコンはデフォルトのものを設定)

            this.MainIcon = iconMain ?? Properties.Resources.MIcon;
            this.TabIcon = iconTab ?? Properties.Resources.TabIcon;
            this.NIconAt = iconAt ?? iconMain ?? Properties.Resources.At;
            this.NIconAtRed = iconAtRed ?? Properties.Resources.AtRed;
            this.NIconAtSmoke = iconAtSmoke ?? Properties.Resources.AtSmoke;

            if (iconReply != null && iconReplyBlink != null)
            {
                this.ReplyIcon = iconReply;
                this.ReplyIconBlink = iconReplyBlink;
            }
            else
            {
                this.ReplyIcon = iconReply ?? iconReplyBlink ?? Properties.Resources.Reply;
                this.ReplyIconBlink = this.NIconAt;
            }

            if (iconRefresh1 == null)
            {
                this.NIconRefresh = new[] {
                    Properties.Resources.Refresh, Properties.Resources.Refresh2,
                    Properties.Resources.Refresh3, Properties.Resources.Refresh4,
                };
            }
            else if (iconRefresh2 == null)
            {
                this.NIconRefresh = new[] { iconRefresh1 };
            }
            else if (iconRefresh3 == null)
            {
                this.NIconRefresh = new[] { iconRefresh1, iconRefresh2 };
            }
            else if (iconRefresh4 == null)
            {
                this.NIconRefresh = new[] { iconRefresh1, iconRefresh2, iconRefresh3 };
            }
            else // iconRefresh1 から iconRefresh4 まで全て揃っている
            {
                this.NIconRefresh = new[] { iconRefresh1, iconRefresh2, iconRefresh3, iconRefresh4 };
            }
        }