html中隐藏域hidden的作用介绍及使用示例

int n = 0;

public void ProcessRequest (HttpContext context) {

context.Response.ContentType = "text/html";

string path = context.Request.MapPath("数值自增.htm");

string html = System.IO.File.ReadAllText(path);

//判断页面是否是第一次加载

string viewstate = context.Request.Form["_viewstate"];

if (!string.IsNullOrEmpty(viewstate))

{

//点击按钮 post

//获取隐藏域的值

string s = context.Request.Form["_p"];

if (int.TryParse(s, out n))

{

n++;

html = html.Replace("@n",n.ToString());

}

}

else

{

//页面首次加载,给p和p对应的隐藏域赋值

html = html.Replace("@n", n.ToString());

}

context.Response.Write(html);

}