新手求助：.net操作cookies
思路是这样的：做了三个按钮，点了以后加载不同的CSS文件，并通过cookies来保存用户所选择的CSS信息。现在只是暂时用一个Label控件来显示用户选择了哪个CSS。
问题是：每次页面加载时Label控件上显示的字都不是cookies里所保存的。刷新页面以后得到的才是cookies里的信息。
请问一下程序是哪里错了吗？
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (Request.Browser.Cookies == true)
{
if (Request.Cookies[ "myStyle "] == null)
{
HttpCookie MyCookie = new HttpCookie( "myStyle ");
MyCookie.Value = "style1 ";
Response.Cookies.Add(MyCookie);
this.txtName.Text = "you haven never beet to this website. ";
}
else
{
this.txtName.Text = Request.Cookies[ "myStyle "].Value;
}
}
}
protected void Button1_Click(object sender, EventArgs e)
{
HttpCookie MyCookie = new HttpCookie( "myStyle ");
MyCookie.Value = "style1 ";
Response.Cookies.Add(MyCookie);
}
protected void Button2_Click(object sender, EventArgs e)
{
HttpCookie MyCookie = new HttpCookie( "myStyle ");
MyCookie.Value = "style2 ";
Response.Cookies.Add(MyCookie);
}
protected void Button3_Click(object sender, EventArgs e)
{
HttpCookie MyCookie = new HttpCookie( "myStyle ");
MyCookie.Value = "style3 ";
Response.Cookies.Add(MyCookie);
}
}
[解决办法]
page_load执行在button_click之前
所以你在page_load里取到的Request.Cookies[ "myStyle "].Value是上一次button_click里设置的值
在每个button_click函数的最后加一句Response.Redirect(Request.Url.ToString());可以达到你想要的效果
.....
protected void Button1_Click(object sender, EventArgs e)
{
HttpCookie MyCookie = new HttpCookie( "myStyle ");
MyCookie.Value = "style1 ";
Response.Cookies.Add(MyCookie);
Response.Redirect(Request.Url.ToString());
}
protected void Button2_Click(object sender, EventArgs e)
{
HttpCookie MyCookie = new HttpCookie( "myStyle ");
MyCookie.Value = "style2 ";
Response.Cookies.Add(MyCookie);
Response.Redirect(Request.Url.ToString());
}
protected void Button3_Click(object sender, EventArgs e)
{
HttpCookie MyCookie = new HttpCookie( "myStyle ");
MyCookie.Value = "style3 ";
Response.Cookies.Add(MyCookie);
Response.Redirect(Request.Url.ToString());
}
