c# - C#如何在每1秒后更改Form1背景？

Question

有什么方法可以在每 1 秒后更改 Window Form1 背景，如下所示：

Second 1: Yellow
Second 2: Green
Second 3: Yellow
Second 4: Green
...

Answer 1

将 Timer 控件拖放到 Form1 上

将计时器间隔设置为 1000 毫秒（1 秒）。

private int caseSwitch = 0;
private void timer1_Tick(object sender, EventArgs e)
{
    caseSwitch++;
    switch (caseSwitch)
    {
        case 1:
            this.BackColor = Color.Yellow;
            break;
        case 2:
            this.BackColor = Color.Green;
            break;
    }

    if (caseSwitch == 2) caseSwitch = 0;
}

Answer 2

试试这个：

        var timer = new Timer() { Interval = 1000, Enabled = true, };
        timer.Tick += (s, e) =>
            this.BackColor =
                    this.BackColor == Color.Green ? Color.Yellow : Color.Green;

Answer 3

    public Form1()
    {
        this.BackColor = Color.Green;
        InitializeComponent();
        var timer = new Timer();
        timer.Interval = 1000;
        timer.Tick += new EventHandler(timer_Tick);
        timer.Start();
    }

    void timer_Tick(object sender, EventArgs e)
    {
        var colors = new[] { Color.Yellow, Color.Green};
        var index = DateTime.Now.Second % colors.Length;
        this.BackColor = colors[index];
    }

Answer 4

正如杰里米所说

将 Timer 控件拖放到 Form1 上，并将 Timer Interval 设置为 1000 毫秒 >（1 秒）。

在 Timer Tick 事件处理程序上，逻辑可能是这样的，

private void timer1_Tick(object sender, EventArgs e)
{
    if(this.BackColor == Color.Green)
            this.BackColor = Color.Yellow;
    else
            this.BackColor = Color.Green;
}

Answer 5

private void button1_Click(object sender, EventArgs e)
        {
            timer1.Interval = 1000;
            timer1.Enabled = true;
            timer1.Tick += new EventHandler(timer1_Tick);
            timer2.Interval = 1000;
            timer2.Tick += new EventHandler(timer2_Tick);
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
                txt_trp.BackColor = Color.Red;
                txt_trm.BackColor = Color.Yellow;
                timer2.Enabled = true;
                timer1.Enabled = false;
        }
        private void timer2_Tick(object sender, EventArgs e)
        {
                txt_trp.BackColor = Color.Yellow;
                txt_trm.BackColor = Color.Red;
                timer1.Enabled = true;
                timer2.Enabled = false;
        }