判断正整数

[bychgh]

 protected void Page_Load(object sender, EventArgs e)
    {

        string keywords =Request.QueryString["keywords"];//关键字
        int totalcount;//总记录数
        int currentpage = 1;//当前页
        int PageSize = 5;//分页大小

....
        //计算总页数;totalpage
        int totalpage = 0;
        if (totalcount / PageSize == 0)
        {
            totalpage = totalcount / PageSize;
        }
        else
        {
            totalpage = totalcount / PageSize + 1;
        }
//判断page
 if (string.IsNullOrEmpty(Request.QueryString["page"]) || judgeType.isNumber(Request.QueryString["page"]) == false)
        {
            currentpage = 1;
        }
        else
        {

            int tempPageIndex = Convert.ToInt32(Request.QueryString["page"]);

            if (tempPageIndex <= 0)
            {
                currentpage = 1;
            }
            else if (tempPageIndex > totalpage)
            {
                currentpage = totalpage;
            }

        }
aManage.SetArticleList("articleSearchPage", cid, PageSize, currentpage, keywords);//搜索新闻
     }

judgeType 类

public class judgeType
{
    public judgeType()
    {
       
    }    
   
    /// <summary>
    /// 判断是否为正整数
    /// </summary>
    /// <param name="strValue"></param>
    /// <returns>是正整数返回true,不是返回false</returns>
    public static bool isNumber(string strValue)
    {
       
        Regex regex = new Regex("^[0-9]*[1-9][0-9]*$");
        return regex.IsMatch(strValue.Trim()); 

    }
}

在Page_Load里定义了 currentpage =1，我在前台传入page值，比如点分页2，3，页面内容还是显示第一页内容，如果定义currentpage = Convert.ToInt32(Request.QueryString["page"])可以分页显示，当传入字符的时候，都出错，没判断page是正整数，帮看看是哪儿的问题

[编程有钱人了]

^[1-9]\d*$　 　 //匹配正整数

[孟子E章]

if(Request.QueryString["page"]==null)
currentpage =1;
else
{
if(Int32.TryParse(Request.QueryString["page"].ToString(),out currentpage ) ==false)
currentpage =1;
}

[wxg22526451]

判断有问题。。
try->

//判断page
 if (string.IsNullOrEmpty(Request.QueryString["page"]) )
   {
            currentpage = 1;//为空
    }
   else
    {
     if(judgeType.isNumber(Request.QueryString["page"]) == false)
            currentpage = 1;//不为空但不是整数
       int tempPageIndex = Convert.ToInt32(Request.QueryString["page"]);
       //......

[wuyq11]

currentpage =Request.QueryString["page"]==null?1:(judgeType.isNumber(Request.QueryString["page"]):Convert.ToInt32(Request.QueryString["page"]):1);

[wuyq11]

currentpage =Request.QueryString["page"]==null?1:(judgeType.isNumber(Request.QueryString["page"])?Convert.ToInt32(Request.QueryString["page"]):1);

[zhangkewen1234]

判断出错，加个“！”

if (string.IsNullOrEmpty(Request.QueryString["page"]) || !judgeType.isNumber(Request.QueryString["page"]))

[卧_槽]

uint.TryParse

[bychgh]

我在地址栏把*.aspx?page=1,改成*.aspx?page=eez,换成字符的，还是一样报错

[jiujiang88]

判断正整数出错.

[bychgh]

if (Request.QueryString["page"] == null)
        {
            currentpage = 1;
        }
        else
        {
            //判断是否为数值
            if (judgeType.isNumber(Request.QueryString["page"]) == false)
            {
                currentpage = 1;
            }
            else // 是数值
            {

                if (Convert.ToInt32(Request.QueryString["page"]) > totalpage) //是否大于总页数
                {
                    currentpage = totalpage;
                }
                else
                {
                    currentpage = Convert.ToInt32(Request.QueryString["page"]);
                }

            }
        }

这个正确

[编程有钱人了]

int i=0;
int.TryParse(要判断的数字,out i)