ASP.NET Tutorial/Cookie/Read

Материал из .Net Framework эксперт
Версия от 14:57, 26 мая 2010; Admin (обсуждение | вклад) (1 версия)
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List all cookies contained in the Request.Cookies collection

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    void Page_Load()
    {
        ArrayList colCookies = new ArrayList();
        for (int i = 0; i < Request.Cookies.Count; i++)
            colCookies.Add(Request.Cookies[i]);
        grdCookies.DataSource = colCookies;
        grdCookies.DataBind();
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Get All Cookies</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:GridView
        id="grdCookies"
        Runat="server"/>
    </div>
    </form>
</body>
</html>


Read cookie, if not there, create one (C#)

File: Default.ascx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="CookieExample" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <div>
        <asp:Label ID="lblWelcome" runat="server" EnableViewState="False" ></asp:Label>
      </div>
      <br />
      Name:
      <asp:TextBox ID="txtName" runat="server" Width="178px"></asp:TextBox>
      <asp:Button ID="cmdStore" runat="server" OnClick="cmdStore_Click" Text="Create Cookie" />
    </div>
    </form>
</body>
</html>
File: Default.ascx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class CookieExample : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    HttpCookie cookie = Request.Cookies["Preferences"];
    if (cookie == null)
    {
      lblWelcome.Text = "<b>Unknown Customer</b>";
    }
    else
    {
      lblWelcome.Text = "<b>Cookie Found.</b><br><br>";
      lblWelcome.Text += "Welcome, " + cookie["Name"];
    }
    }
  protected void cmdStore_Click(object sender, EventArgs e)
  {
    HttpCookie cookie = Request.Cookies["Preferences"];
    if (cookie == null)
    {
      cookie = new HttpCookie("Preferences");
    }
    cookie["Name"] = txtName.Text;
    cookie.Expires = DateTime.Now.AddYears(1);
    Response.Cookies.Add(cookie);
    lblWelcome.Text = "<b>Cookie Created.</b><br><br>";
    lblWelcome.Text += "New Customer: " + cookie["Name"];
  }
}


Reading Cookies

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    void Page_Load()
    {
        if (Request.Cookies["message"] != null)
            lblCookieValue.Text = Request.Cookies["message"].Value;
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Get Cookie</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    The value of the message cookie is:
    <asp:Label
        id="lblCookieValue"
        Runat="server" />
    </div>
    </form>
</body>
</html>