实现记住密码,有效期等功能.cookie.

cookie对象的expires属性和value属性.

下面是两部分实例:

/////////////////////////////////////////////////////////////////////////////////////////////////////

using System;

using System.Collections;

using System.Configuration;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;

public partial class admin : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

        if (Session["username"] == null)

        {

            Response.Redirect("Default.aspx");

        }

        else

        {

            Response.Write("用户" + Session["username"] + "成功登录！");

        }

    }

}

///////////////////////////////////////////////////////////////////////////

using System;

using System.Configuration;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;

public partial class _Default : System.Web.UI.Page 

{

    protected void Page_Load(object sender, EventArgs e)

    {

    }

    protected void Button2_Click(object sender, EventArgs e)

    {

        txtname.Text = "";

        txtpwd.Text = "";

    }

    protected void Button1_Click(object sender, EventArgs e)

    {

        if (txtname.Text.Trim().Equals("mr") && txtpwd.Text.Trim().Equals("mrsoft"))

        {

            Session["username"] = txtname.Text.Trim();

            if (ckbauto.Checked)

            {

                if (Request.Cookies["username"] == null)

                {

                    Response.Cookies["username"].Expires = DateTime.Now.AddDays(30);

                    Response.Cookies["userpwd"].Expires = DateTime.Now.AddDays(30);

                    Response.Cookies["username"].Value = http://www.mamicode.com/txtname.Text.Trim();

                    Response.Cookies["userpwd"].Value = http://www.mamicode.com/txtpwd.Text.Trim();

                }

            }

            Response.Redirect("admin.aspx");

        }

        else

        {

            ClientScript.RegisterStartupScript(this.GetType(),"","alert(‘用户名或密码错误！‘);",true);

        }

    }

    protected void txtname_TextChanged(object sender, EventArgs e)

    {

        if (Request.Cookies["username"] != null)

        {

            if (Request.Cookies["username"].Value.Equals(txtname.Text.Trim()))

            {

                txtpwd.Attributes["value"] = Request.Cookies["userpwd"].Value;

            }

        }

    }

}

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缓存对象cookie对象(asp.net技术)