设计意图：将login页面中的登录信息保存在login的Cookie中，转到Home页面时，利用得到的Cookie值就能自动登录
login页面前台关于Cookie的代码：
<td>
<asp:DropDownList ID="time" runat="server">
<asp:ListItem Selected="True" Value="1">不保存</asp:ListItem>
<asp:ListItem Value="14">两周</asp:ListItem>
<asp:ListItem Value="30">一个月</asp:ListItem>
<asp:ListItem Value="0">不创建</asp:ListItem>
</asp:DropDownList>
</td>
login页面后台关于Cookie的代码：
protected void Login_Click(object sender, EventArgs e)
{
//创建一个新的Cookie
HttpCookie newCookie = new HttpCookie("User");
//往Cookie里面添加值，均为键/值对。Cookie可以根据关键字寻找到相应的值
newCookie.Values.Add("Name",nameID.Text.Trim());
newCookie.Values.Add("Pwd",pwdID.Text.Trim());
//设置Session的值
Session["Name"] = nameID.Text.Trim();
Session["Pwd"] = pwdID.Text.Trim();
if (time.SelectedValue == "14")
{
newCookie.Expires = DateTime.Now.AddDays(14);
}
else if (time.SelectedValue == "30")
{
newCookie.Expires = DateTime.Now.AddDays(30);
}
else if (time.SelectedValue == "0")
{
newCookie.Expires = DateTime.Now.AddDays(0);
}
//Cookie的设置页面要用Response
Response.AppendCookie(newCookie);
Response.Redirect("Home.aspx");
}
//Home页面前台代码
<asp:Button ID="btnReset" runat="server" Text="注销" onclick="btnReset_Click"
Visible="False" />
//Home页面后台代码
protected void Page_Load(object sender, EventArgs e)
{
//获得login页面的Cookie值 要用Request
HttpCookie newCookie = Request.Cookies["User"];
if (newCookie != null)
{
Response.Write("欢迎" + newCookie.Values["Name"] + "来到该网站，" + "你的密码是：" + newCookie.Values["Pwd"]);
btnReset.Visible = true;
}
//获得login页面的session值
if (Session["Name"] != null)
{
Response.Write("欢迎" + Session["Name"] + "来到该网站，" + "你的密码是：" + Session["Pwd"]);
btnReset.Visible = true;
}
else
{
Response.Write("您还没有登陆！<a href='Login.aspx'>返回登陆</a>");
}
}
protected void btnReset_Click(object sender, EventArgs e)
{
HttpCookie newCookie = Request.Cookies["User"];
if (newCookie != null)
{
newCookie.Expires = DateTime.Now.AddDays(-1);
Response.Cookies.Add(newCookie);
Response.Redirect("Login.aspx");
}
}