分页算法

 public string RenderToHTML()
        {
            Check();
            StringBuilder sb = new StringBuilder();
            //double tempCount = (TotalCount+(0.0) )/ PageSize;
            //int pageCount = (int)Math.Ceiling(tempCount);
            int visibleStart = CurrentPageIndex - MaxPageCount / 2;
            if (visibleStart<1)//6还是没区别
            {
                visibleStart = 1;
            }
            int visibleEnd = visibleStart + MaxPageCount;
            if (visibleEnd > PageCount)
            {
                visibleEnd = PageCount;
            }
            if (CurrentPageIndex>1)
            {
                sb.Append(GetPageLink(1,"首页"));
                sb.Append(GetPageLink(CurrentPageIndex-1,"上一页"));
            }
            else
            {
                sb.Append("<span>首页</span>");
                sb.Append("<span>上一页</span>");
            }
            for (int i = visibleStart; i <=visibleEnd; i++)
            {
                if (i==CurrentPageIndex)
                {
                    sb.Append("<span>").Append(i).Append("</span>");
                }
                else
                {
                    sb.Append(GetPageLink(i,i.ToString()));
                }
            }
            if (CurrentPageIndex < PageCount)
            {
                sb.Append(GetPageLink(CurrentPageIndex+1,"下一页"));
                sb.Append(GetPageLink(PageCount, "末页"));
            }
            else
            {
                sb.Append("<span>下一页</span>");
                sb.Append("<span>末页</span>");
            }
            return sb.ToString();
        }