复制代码 代码如下:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
HttpCookie cookie = Request.Cookies["loginInfo"];

if (cookie != null)
{
cb_repwd.Checked = true;
tb_loginName.Text = UIHelper.Decrypt(cookie["loginName"]);
tb_pwd.Attributes.Add("value", UIHelper.Decrypt(cookie["pwd"]));
}
else
{
tb_pwd.Attributes.Add("value", "******");
}

}

}

protected void btn_login_Click(object sender, EventArgs e)
{

if (UIHelper.GetString(Session["Code"]).ToUpper()!=this.tb_code.Text.Trim().ToUpper())
{
oJavaScript.Alert("验证码输入不正确");
return;
}

NetUserService NerService = ContextFactory.GetObject<NetUserService>("NetUserService");
string sql = string.Format("from NetUser where LoginName='{0}'", tb_loginName.Text.Trim());
IList<NetUser> list = NerService.Find(sql);
if (list.Count > 0)
{
if (list[0].Status == 2)
{
oJavaScript.Alert("帐号已停用，请联系管理员");
return;
}
}

if (NerService.Login(tb_loginName.Text.Trim(), oSecurity.GetPwdEncrypt(tb_pwd.Text.Trim())))
{
HttpCookie cookie = Request.Cookies["loginInfo"];
if (cb_repwd.Checked)
{
if (cookie == null)
{
HttpCookie cookielogin = new HttpCookie("loginInfo");
setCookies(cookielogin,7);
}
else
{
if (UIHelper.Decrypt(Request.Cookies["loginInfo"]["loginName"]) != tb_loginName.Text.Trim())
{
setCookies(cookie, 7);
}
}
}
else
{
setCookieExpires(cookie);
}


oJavaScript.Redirect("/");
}
else
{
oJavaScript.Alert( "用户名或密码不正确");
}
}

#region cookie
/// <summary>
/// 设置cookie
/// </summary>
/// <param name="cookielogin">HttpCookie cookielogin</param>
/// <param name="Expires">有效期</param>
private void setCookies(HttpCookie cookielogin, int Expires)
{
cookielogin.Values["loginName"] = UIHelper.Encrypt(tb_loginName.Text.Trim());
cookielogin.Values["pwd"] = UIHelper.Encrypt(tb_pwd.Text.Trim());
cookielogin.Expires = DateTime.Now.AddDays(Expires);
Response.AppendCookie(cookielogin);
}

/// <summary>
/// 设置cookie失效
/// </summary>
/// <param name="cookielogin">HttpCookie cookielogin</param>
private void setCookieExpires(HttpCookie cookielogin)
{
if (cookielogin != null)
{
cookielogin.Expires = DateTime.Now.AddDays(-1); ;
Response.AppendCookie(cookielogin);
}
}
#endregion

设置cookie过期其实就是修改cookie，必须重新向客户端发送cookie

Request.Cookies取cookie, response，cookies添加cookie

虽然简单，但是不太了解的还是很容易出错