程序代码：

private void 布局()
        {
            Button[] bu = { button1, button2, button3, button4,button5,button6,button7,button8,button9};
            foreach (Button but in bu)
            {
                but.Top = 0;
                but.Left = 0;
                but.Height = 100;
                but.Width = 100;
                but.Cursor = Cursors.Hand;
            }
            for (int i = 0; i < 3;i++ )
            {
                bu[i].Left = i<=0?0:bu[i-1].Left+bu[i].Width;
            }
            for (int i = 3; i < 6;i++ )
            {
                bu[i].Top = bu[i].Height;
                bu[i].Left = i <= 3 ? 0 : bu[i - 1].Left+bu[i].Width;
            }
            for (int i = 6; i < 9;i++ )
            {
                bu[i].Top = bu[i].Height * 2;
                bu[i].Left = i <= 6 ? 0 : bu[i - 1].Left+bu[i].Width;
            }
        }

程序代码：

FlowLayoutPanel flowLayoutPanel1 = new FlowLayoutPanel();//为什么要添加这样一个控件？
for (int i = 0; i < 9; i++)
{
    Button btn = new Button();
    btn.Height = 100;
    btn.Width = 100;
    btn.Cursor = Cursors.Hand; 
    btn.Name = btn.Text = "button" + (i + 1);

    flowLayoutPanel1.Dock = DockStyle.Left;//这个又是什么意思啊？
    flowLayoutPanel1.Width = 330;
    flowLayoutPanel1.Controls.Add(btn);//
}
this.Controls.Add(flowLayoutPanel1);//为什么要使用这个添加？