请大家帮帮忙,帮我解释下这个循环是什么意思,实现什么样的功能,万分感谢

Question

  public void fillyear(DropDownList list)
    {
        int i = 0, j = 0;
        list.Items.Clear();
        if (list.SelectedIndex == 0)
        {
            if (DateTime.Today.Month == 1)
            {
                j = DateTime.Today.Year - 1;
                for (i = j - 2; i <= DateTime.Today.Year - 1; i++)
                {
                    list.Items.Add(new ListItem("" + j + "", "" + j + ""));
                    j = j - 1;
                }
            }
            else
            {
                j = DateTime.Today.Year;
                for (i = j - 2; i <= DateTime.Today.Year; i++)
                {
                    list.Items.Add(new ListItem("" + j + "", "" + j + ""));
                    j = j - 1;
                }
            }        }
        else
        {
            if (DateTime.Today.Month - 4 > 0)
            {
                j = DateTime.Today.Year;
                for (i = j - 2; i <= DateTime.Today.Year; i++)
                {
                    list.Items.Add(new ListItem("" + j + "", "" + j + ""));
                    j = j - 1;
                }
            }
            else
            {
                j = DateTime.Today.Year - 1;
                for (i = j - 2; i <= DateTime.Today.Year - 1; i++)
                {
                    list.Items.Add(new ListItem("" + j + "", "" + j + ""));
                    j = j - 1;
                }
            }
        }
    }
   

Answer 1

看方法名就是填充年到DropDownList

Answer 2

看方法名就是填充年份到DropDownList

Answer 3

看这个：public void fillyear(DropDownList list)，就大概知道点东西了。填充下拉框年份的，运行一点效果就知道了。方法名fillyear改为FillYear，养成命名的好习惯。

Answer 4

  j = DateTime.Today.Year - 1;
  for (i = j - 2; i <= DateTime.Today.Year - 1; i++)
  {
  list.Items.Add(new ListItem("" + j + "", "" + j + ""));
  j = j - 1;
  }
这写法真不爽