按 ENTER 键更改箭头的位置

Question

我正在处理一个 C# 项目，我想通过按 ENTER 键来更改箭头的位置，并针对不同的组合框选择使用不同的迭代大小。实际上它有效，但问题是我无法在更改组合框选择之前刷新表单。我想逐步查看迭代，但如果我更改组合框选择，它会移动。代码如下：

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {


            if (comboBox1.SelectedIndex == 0)
            {

                this.BackColor = Color.Black;
                label1.ForeColor = Color.Silver;
                label1.Text = "Environment is Space";
                pictureBox2.Image = list.Images[4];
                t = 100; // iteration amount

            }

            else if (comboBox1.SelectedIndex == 1)
            {
                this.BackColor = Color.PaleTurquoise;
                label1.Text = "Environment is Water";
                pictureBox2.Image = list.Images[3];
                t = 50; // iteration amount

            }

            else if (comboBox1.SelectedIndex == 2)
            {
                this.BackColor = Color.DarkGoldenrod;
                label1.ForeColor = Color.Firebrick;
                label1.Text = "Environment is Honey";
                pictureBox2.Image = list.Images[2];
                t = 20; // iteration amount
            }

        }

        private void Form1_Paint(object sender, PaintEventArgs e)
        {

            // Drawing arrow
            Pen pen = new Pen(Color.FromArgb(255, 0, 0, 255), 8);
            pen.StartCap = LineCap.ArrowAnchor;
            pen.EndCap = LineCap.RoundAnchor;
            e.Graphics.DrawLine(pen, x+50, 200, x, 200);

        }

        private void Form1_KeyPress(object sender, KeyPressEventArgs e)
        {
            // pressed Enter => change x
            if (e.KeyChar == (char)Keys.Return)
            {
                e.Handled = true;
                if (x < y)
                {
                    x += t;

                }
            }
        }

为了更清楚： 我想要：单击-> 输入 + 移动-> 箭头 + 单击-> 输入 + 移动-> 箭头
现在它的工作方式如下：单击-> Enter + Change-> comboBox + Move->Arrow

非常感谢！

Answer 1

你想要一个计时器解决方案吗？

System.Timers.Timer timer = new System.Timers.Timer(500);
        timer.Elapsed += (s, e) => { 
            this.Invoke((MethodInvoker)delegate { comboBox1.SelectedIndex = (comboBox1.SelectedIndex + 1) % comboBox1.Items.Count; });
        };
        timer.Start();

很难理解你的意思。