Winform Panel button location

 this.btnExit.Location = new System.Drawing.Point(pnlButton.Width / 2, pnlButton.Height / 2);

        /// <summary>
        /// 设置按钮显示位置
       /// </summary>
       /// <param name="targetPanel">要设置按钮的Panel</param>
       /// <param name="buttonSpace">按钮之间的间隔</param>
        public void SetButtonCenter(Panel targetPanel, int buttonSpace)
        {
            int length = 0;
            List<Button> listBtn = new List<Button>();
            System.Windows.Forms.Control.ControlCollection c = targetPanel.Controls;
            foreach (Button btn in c)
            {
                listBtn.Add(btn);
                length += btn.Width + buttonSpace;
            }
            int pnlLength = targetPanel.Width;
            if (length > pnlLength) //本身按钮的长度总和大于了panel的长度，不调整
                return;
            int startPos = (pnlLength - length) / 2 - 10; //左缩进10个点位
            int yPos = targetPanel.Height / 2;
            int xPos = startPos;
            foreach (Button btn in listBtn)
            {
                btn.Location = new System.Drawing.Point(xPos, yPos);
                xPos += btn.Width + buttonSpace;
            }
        }

private void Form1_Load(object sender, EventArgs e)
        {
            SetButtonCenter(panelTest, 2);
        }
        /// <summary>
        /// 设置按钮显示位置
        /// </summary>
        /// <param name="pnlButton">需要调整按钮顺序的Panel</param>
        /// <param name="buttonSpace">按钮间隔</param>
        public void SetButtonCenter(Panel targetPanel,int buttonSpace)
        {
            int length = 0;
            List<Button> listBtn = new List<Button>();
            System.Windows.Forms.Control.ControlCollection c = targetPanel.Controls;
            foreach (Button btn in c)
            {
                listBtn.Add(btn);
                length += btn.Width + buttonSpace;
            }
            int pnlLength = targetPanel.Width;
            if (length > pnlLength) //本身按钮的长度总和大于了panel的长度，不调整
                return;
            int startPos = (pnlLength - length) / 2 - 10; //左缩进10个点位
            int yPos = targetPanel.Height / 2;
            int xPos = startPos;
            listBtn.Sort(new ButtonSort());
            foreach (Button btn in listBtn)
            {
                btn.Location = new System.Drawing.Point(xPos, yPos);
                xPos += btn.Width + buttonSpace;
            }
        }
        public class ButtonSort : IComparer<Button>
        {
            #region IComparer<Button> Members
            //IComparer<T> 接口:定义类型为比较两个对象而实现的方法。
            public int Compare(Button x, Button y)
            {
                if (x.TabIndex >= y.TabIndex)
                    return 1;
                else
                    return -1;
            }
            #endregion
        }