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返回错误

CS0029
C# 无法将类型“void”隐式转换为“System.EventHandler”

该函数在这里使用：

gameTimer.Tick += UpdateScreen();

功能是：

private void UpdateScreen()
{
    if(Settings.GameOver == true)
    {
        if (Input.KeyPressed(Keys.Enter))
        {
            StartGame();
        }
    }
    else
    {
        if (Input.KeyPressed(Keys.Right) && Settings.direction != Direction.Left)
            Settings.direction = Direction.Right;
        else if (Input.KeyPressed(Keys.Left) && Settings.direction != Direction.Right)
            Settings.direction = Direction.Left;
        else if (Input.KeyPressed(Keys.Up) && Settings.direction != Direction.Down)
            Settings.direction = Direction.Up;
        else if (Input.KeyPressed(Keys.Down) && Settings.direction != Direction.Up)
            Settings.direction = Direction.Down;

        MovePlayer();
    }

    pbCanvas.Invalidate();
}