未将对象引用设置到对象的实例。
protected void Page_Load(object sender, EventArgs e){
Application["PageClick"]=(int)Application["PageClick"] + 1; Response.Write(string.Format("访问数:{0}<br/>",Application["PageClick"]));
}
protected void Page_Load(object sender, EventArgs e){
Application["PageClick"]=(int)Application["PageClick"] + 1; Response.Write(string.Format("访问数:{0}<br/>",Application["PageClick"]));
}
protected void Page_Load(object sender, EventArgs e){
if(Application["PageClick"]==null){
Application["PageClick"]=1;
}else{
Application["PageClick"]=(int)Application["PageClick"] + 1;
}
Response.Write(string.Format("访问数:{0}<br/>",Application["PageClick"]));
}
出现(int)Application["PageClick"] 转换无效
应该每次的结果都是1呀
还有如何用session保存计数呢???