背景色渐变的问题

Question

        private void button1_Click(object sender, EventArgs e)
        {
            label1.BackColor = Color.Red;
            Thread.Sleep(1000);
            label1.BackColor = Color.Lime;
        }
为什么没有先红后绿的效果,而是停顿后直接显绿
新建一个线程再调用以上代码即可实现.
请高手帮忙解释一下

Answer 1

private void button1_Click(object sender, EventArgs e)
        {
            label1.BackColor = Color.Red;
            label1.Reflush();
            Thread.Sleep(1000);
            label1.BackColor = Color.Lime;
            label1.Reflush();
        } 

Answer 2

this.label1.BackColor = Color.White;
            this.label1.Refresh();
            System.Threading.Thread.Sleep(1000);
            this.label1.BackColor = Color.Black;
            this.label1.Refresh();
方法名字错了，应为Refresh();