无法从事件处理程序访问类变量

问：

我正在制作一个用于安排座位的 Web 应用程序，我编写了以下代码：

class SeatMap {
    constructor (parentElement) {
        this.#createSeats();
    }

    #createSeats () {
        this.seatList = [];
        for (let a = 0; a < this.row; a++) {
            for (let b = 0; b < this.column; b++) {
                this.seatList[a].push(new Seat(this,a,b));
            }
        }
    }

class Seat {
    constructor(seatContainer, rowNum, colNum) {
        this.seatContainer = seatContainer;
        this.seatTB.addEventListener("keydown", this.#keydownTB);
    }

    // Key Events Handler
    #keydownTB (event) {
        const seatContainerConector = this.seatContainer;
        if (event.key === "ArrowRight") {
            console.log(seatContainerConector); // Undefined
        }
    }
}

// I only wrote codes related to the problem here.

但是，只是把我还给我.
我试图删除并使用，但它没有用。
我该如何解决这个问题？console.log(seatContainerConector);undefinedconst seatContainerConector = this.seatContainer;console.log(this.seatContainer);