ASP.Net/Session Cookie/Session Variables — различия между версиями

Текущая версия на 11:53, 26 мая 2010

Содержание

1 Add and get value from session (VB.net)
2 Clear session values (VB.net)
3 Copy session values (VB.net)
4 Get all session keys (VB.net)
5 Get Cookie value and assign to the label in C#
6 Get Cookie value (C#)
7 Get session code page in VB (VB.net)
8 Get value from session in cross page posting (C#)
9 Get value from session in cross page posting(VB)
10 Pass variables between pages (VB.net)
11 Pass variables with & sign (VB.net)
12 Remove all session content (VB.net)
13 Remove all session values (VB.net)
14 Remove session value by index (VB.net)
15 Remove value from session value (VB.net)
16 Session get Message (C#)
17 Session item count (VB.net)
18 Session Set message (C#)
19 Setting values in session state (C#)
20 Setting values in session state (VB)
21 Simple session data: set and retrieve
22 Store your Object in Session (C#)
23 Use Session item (VB.net)
24 Use session to store action time (VB.net)
25 Use session variables (VB.net)
26 Write value to session (VB.net)

Add and get value from session (VB.net)

<%@ Page Language="vb" %>
<html>
   <head>
      <script runat="server">
         Sub Page_Load()
            Dim myBaz As String = "saved value"
            Session.Add("baz", myBaz)
            Message.Text = Session("baz")
         End Sub
      </script>
   </head>
<body>
   <form runat="server">
      <asp:label id="Message" runat="server"/>
   </form>
</body>
</html>

Clear session values (VB.net)

<%@ Page Language="vb" %>
<html>
   <head>
      <script runat="server">
         Sub Page_Load()
            Session.Clear()
            Message.Text = "There are " & Session.Count & _
               " items in the Session collection."
         End Sub
      </script>
   </head>
<body>
   <form runat="server">
      <asp:label id="Message" runat="server"/>
   </form>
</body>
</html>

Copy session values (VB.net)

<%@ Page Language="vb" %>
<html>
   <head>
      <script runat="server">
         Sub Page_Load()
            If Session.Count > 0 Then
               Dim myArray As Array = Array.CreateInstance(GetType(Object), _
                  Session.Count)
               Session.CopyTo(myArray, 0)
               Message.Text = "The first item in the array is: " & myArray(0)
            End If
         End Sub
      </script>
   </head>
<body>
   <form runat="server">
      <asp:label id="Message" runat="server"/>
   </form>
</body>
</html>

Get all session keys (VB.net)

<%@ Page Language="vb" %>
<html>
   <head>
      <script runat="server">
         Sub Page_Load()
            Dim Key As String
            Message.Text = "Session Keys:"
            For Each Key in Session.Keys
               Message.Text &= "</br>Key:&nbsp;&nbsp;&nbsp;" & Key
               Message.Text &= "</br>Value:&nbsp;&nbsp;&nbsp;" & Session(Key)
            Next
         End Sub
      </script>
   </head>
<body>
   <asp:label id="Message" runat="server"/>
</body>
</html>

Get Cookie value and assign to the label in C#

<%@ Page Language="C#" %>
<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>

Get Cookie value (C#)

<%@ Page Language="C#" %>
<script runat="server">
    void Page_Load()
    {
        if (Request.Cookies["preferences"] != null)
        {
            lblFirstName.Text = Request.Cookies["preferences"]["firstName"];
            lblLastName.Text = Request.Cookies["preferences"]["lastName"];
            lblFavoriteColor.Text = Request.Cookies["preferences"]["favoriteColor"];
        }
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Get Cookie Values</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    First Name:
    <asp:Label
        id="lblFirstName"
        Runat="server" />
    <br />
    Last Name:
    <asp:Label
        id="lblLastName"
        Runat="server" />
    <br />
    Favorite Color:
    <asp:Label
        id="lblFavoriteColor"
        Runat="server" />
    
    </div>
    </form>
</body>
</html>

Get session code page in VB (VB.net)

<%@ Page Language="vb" %>
<html>
   <head>
      <script runat="server">
         Sub Page_Load()
            Message.Text = "Current Code Page is: " & Session.CodePage
         End Sub
      </script>
   </head>
<body>
   <asp:label id="Message" runat="server"/>
</body>
</html>

Get value from session in cross page posting (C#)

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!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 id="Head1" runat="server">
    <title>Session State</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="TextBox1" Runat="server"></asp:TextBox>
        <asp:Button ID="Button1" Runat="server" Text="Store in Session" 
         OnClick="Button1_Click" />
        <asp:HyperLink ID="HyperLink1" Runat="server" 
         NavigateUrl="NextPage.aspx">Next Page</asp:HyperLink>
    </div>
    </form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
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 _Default : System.Web.UI.Page 
{
    protected void Button1_Click(object sender, EventArgs e)
    {
        Session["mykey"] = TextBox1.Text;
    }
}
File: NextPage.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="NextPage.aspx.cs" Inherits="Retrieve" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.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>
    </form>
</body>
</html>
File: NextPage.aspx.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 Retrieve : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string myValue = (string)Session["mykey"];
        Response.Write(myValue);
    }
}

Get value from session in cross page posting(VB)

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!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 id="Head1" runat="server">
    <title>Session State</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="TextBox1" Runat="server"></asp:TextBox>
        <asp:Button ID="Button1" 
                    Runat="server" 
                    Text="Store in Session" 
                    OnClick="Button1_Click" />
        <asp:HyperLink ID="HyperLink1" 
                       Runat="server" 
                       NavigateUrl="NextPage.aspx">Next Page</asp:HyperLink>
    </div>
    </form>
</body>
</html>
File: Default.aspx.vb

Partial Class _Default
    Inherits System.Web.UI.Page
    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Session("mykey") = TextBox1.Text
    End Sub
End Class
File: NextPage.aspx
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="NextPage.aspx.vb" Inherits="Retrieve" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.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>
    </form>
</body>
</html>
File: NextPage.aspx.vb

Partial Class Retrieve
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim myValue As String = CType(Session("mykey"), String)
        Response.Write(myValue)
    End Sub
End Class

Pass variables between pages (VB.net)

<%@ Page Language="VB" %>
<html>
  <body>
    <%
    Dim Name As String
    Dim Age As String
    Age = 23
    Name = "Sniff"
    %>
    <a href="birthday2.aspx?age=<% Response.Write(Age) %>&name=<%
    Response.Write(Name)%>">click here</a>
  </body>
</html>

<%--
<%@ Page Language="VB" %>
<html>
  <body>
    <center>
      <%
      Dim Name As String
      Dim Age As String
      Name = Request.QueryString("Name")
      Age = Request.QueryString("Age")
      %>
      <h1>Happy Birthday <% Response.Write(Name) %></h1>
      <h3>May the next
      <% Response.Write(Age) %>
      years be as good!</h3>
    </center>
  </body>
</html>

--%>

Pass variables with & sign (VB.net)

<%@ Page Language="VB" %>
<html>
  <body>
    <%
    Dim Name As String
    Dim Age As String
    Age = 23
    Name = "Sniff & Jack"
    %>
    <a href="birthday2.aspx?age=<% Response.Write(Age) %>&name=<%
    Response.Write(Name)%>">click here</a>
  </body>
</html>

<%--
<%@ Page Language="VB" %>
<html>
  <body>
    <center>
      <%
      Dim Name As String
      Dim Age As String
      Name = Request.QueryString("Name")
      Age = Request.QueryString("Age")
      %>
      <h1>Happy Birthday <% Response.Write(Name) %></h1>
      <h3>May the next
      <% Response.Write(Age) %>
      years be as good!</h3>
    </center>
  </body>
</html>

--%>

Remove all session content (VB.net)

<%@ Page Language="vb" %>
<html>
   <head>
      <script runat="server">
         Sub Page_Load()
            Session.Contents.RemoveAll()
            Message.Text = "Removed all items from current Session."
         End Sub
      </script>
   </head>
<body>
   <asp:label id="Message" runat="server"/>
</body>
</html>

Remove all session values (VB.net)

<%@ Page Language="vb" %>
<html>
   <head>
      <script runat="server">
         Sub Page_Load()
            If Session.Count > 0 Then
               Session.RemoveAll()
               Message.Text = "Session collection cleared."
            Else
               Message.Text = "Session collection is already empty."
            End If
         End Sub
      </script>
   </head>
<body>
   <form runat="server">
      <asp:label id="Message" runat="server"/>
   </form>
</body>
</html>

Remove session value by index (VB.net)

<%@ Page Language="vb" %>
<html>
   <head>
      <script runat="server">
         Sub Page_Load()
            If Session.Count > 0 Then
               Session.RemoveAt(0)
               Message.Text = "The item at index 0 was removed."
            Else
               Message.Text = "The item at index 0 does not exist."
            End If
         End Sub
      </script>
   </head>
<body>
   <form runat="server">
      <asp:label id="Message" runat="server"/>
   </form>
</body>
</html>

Remove value from session value (VB.net)

<%@ Page Language="vb" %>
<html>
   <head>
      <script runat="server">
         Sub Page_Load()
            If Not Session("foo") Is Nothing Then
               Session.Remove("foo")
               Message.Text = "Item "foo" was removed."
            Else
               Message.Text = "Item "foo" does not exist."
            End If
         End Sub
      </script>
   </head>
<body>
   <form runat="server">
      <asp:label id="Message" runat="server"/>
   </form>
</body>
</html>

Session get Message (C#)

<%@ Page Language="C#" %>
<script runat="server">
    void Page_Load()
    {
        lblMessage.Text = Session["message"].ToString();
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Session Get</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <asp:Label
        id="lblMessage"
        Runat="server" />
    
    </div>
    </form>
</body>
</html>

Session item count (VB.net)

<%@ Page Language="vb" %>
<html>
   <head>
      <script runat="server">
         Sub Page_Load()
            Session("foo") = "Hello, "
            Session("bar") = "World!"
            Message.Text = "The Session collection contains " & _
               Session.Count & " items.</br>"
            Dim I as Integer
            For I = 0 To Session.Count - 1
               Message.Text &= Session(I)
            Next
         End Sub
      </script>
   </head>
<body>
   <asp:label id="Message" runat="server"/>
</body>
</html>

Session Set message (C#)

<%@ Page Language="C#" %>
<script runat="server">
    void Page_Load()
    {
        Session["message"] = "Hello World!";
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Session Set</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <h1>Session item added!</h1>
    
    </div>
    </form>
</body>
</html>

Setting values in session state (C#)

<%@ Page Language="C#" 
         AutoEventWireup="true"  
         CodeFile="Default.aspx.cs" 
         Inherits="_Default" %>
<!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 id="Head1" runat="server">
    <title>Session State</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="TextBox1" Runat="server"></asp:TextBox>
        <asp:Button ID="Button1" Runat="server" Text="Store in Session" 
         OnClick="Button1_Click" />
        <br />
        <asp:HyperLink ID="HyperLink1" Runat="server" 
         NavigateUrl="Default.aspx">Next Page</asp:HyperLink>
    </div>
    </form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
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 _Default : System.Web.UI.Page 
{
    protected void Button1_Click(object sender, EventArgs e)
    {
        Session["mykey"] = TextBox1.Text;
    }
}

Setting values in session state (VB)

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!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 id="Head1" runat="server">
    <title>Session State</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="TextBox1" Runat="server"></asp:TextBox>
        <asp:Button ID="Button1" Runat="server" Text="Store in Session" 
         OnClick="Button1_Click" />
        <asp:HyperLink ID="HyperLink1" Runat="server" 
         NavigateUrl="Default.aspx">Next Page</asp:HyperLink>
    </div>
    </form>
</body>
</html>
File: Default.aspx.vb
Partial Class _Default
    Inherits System.Web.UI.Page
    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Session("mykey") = TextBox1.Text
    End Sub
End Class

Simple session data: set and retrieve

<script runat=server>
Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
    If Len(Application("ApplicationName")) = 0 Then
        Application("ApplicationName") = "Check In / " _
            & "Check Out Application"
        Application("PageCount") = 0
    End If
    If Not IsPostBack Then
        Application.Lock
        Application("PageCount") = Application("PageCount") + 1
        Application.UnLock
    End If
    lblTitle.Text = Application("ApplicationName")
    lblCount.Text = "This page has been accessed " _
        & Application("PageCount") & " times."
    Session.TimeOut = 20
End Sub
Sub SubmitBtn_Click(Sender As Object, E As EventArgs)
    Session("VisitorsName") = txtVisitorsName.Text
    Response.Redirect("./CheckOut.aspx")
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE><% Response.Write(Application("ApplicationName")) %></TITLE>
</HEAD>
<BODY TEXT="black" LINK="darkred" VLINK="darkred" ALINK="red" LEFTMARGIN="40" TOPMARGIN="60">
<form runat="server">
<Font Face="Tahoma" Size="+1">
<asp:Label 
    id="lblTitle" 
    BorderWidth="7px"
    BorderStyle=9
    Width="90%"
    Font-Size="25pt"
    Font-Name="Arial"
    runat="server"
/>
<BR><BR>
<asp:Label
    id="lblMessage1"
    runat="Server"
    Text="Enter Your Name"
/>
<BR>
<asp:TextBox
    id="txtVisitorsName"
    runat="server"
    MaxLength=50
/>
<BR><BR>
<asp:button 
    id="butOK"
    text="Check In"
    Type="Submit"
    OnClick="SubmitBtn_Click" 
    runat="server"
/>
<BR><BR>
<%@ Page Language=VB Debug=true %>
<asp:Label
    id="lblCount"
    runat="Server"
/>
</Font>
</Form>
</BODY>
</HTML>

<%--  Global.asax
<SCRIPT LANGUAGE="VB" RUNAT="Server">
Sub Application_OnStart
    Application("TaxRate") = 0.5125
    Application("ApplicationName") = "Sample Global.asax"
End Sub
Sub Application_OnEnd
    "code that runs when application ends
End Sub
Sub Session_OnStart
    Application("SessionStarts") = _
        Application("SessionStarts") + 1
    Session.TimeOut = 1
End Sub
Sub Session_OnEnd
    Application("SessionStops") = _
        Application("SessionStops") + 1
End Sub
</SCRIPT>
--%>
<%-- CheckOut.aspx
<%@ Page Language=VB Debug=true %>
<script runat=server>
Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
    If Len(Session("VisitorsName")) = 0 Then
        lblMessage.Text = "You have not checked in! " _
            & "<A HREF=""./checkin.aspx"">Click here</A>" _
            & " to check in."
        butOK.Visible = False
    Else
        lblMessage.Text = "Your Name: " _
            & Session("VisitorsName") & "<BR>"
        if Session.IsCookieless Then
            lblMessage.Text = lblMessage.Text _
                & "Your browser does not support cookies.<BR>"
        else
            lblMessage.Text = lblMessage.Text _
                & "Your browser does support cookies.<BR>"
        End If
        lblMessage.Text = lblMessage.Text _
            & "Session ID: " & Session.SessionID _
            & "<BR>Session Time Out: " & Session.TimeOut _
            & " minutes"
    End If
    lblTitle.Text = Application("ApplicationName")
End Sub
Sub SubmitBtn_Click(Sender As Object, E As EventArgs)
    Session.Abandon
    Response.Redirect("./CheckOut.aspx")
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE><% Response.Write(Application("ApplicationName")) %></TITLE>
</HEAD>
<BODY TEXT="black" LINK="darkred" VLINK="darkred" ALINK="red" LEFTMARGIN="40" TOPMARGIN="60">
<form runat="server">
<Font Face="Tahoma" Size="+1">
<asp:Label 
    id="lblTitle" 
    BorderWidth="7px"
    BorderStyle=9
    Width="90%"
    Font-Size="25pt"
    Font-Name="Arial"
    runat="server"
/>
<BR><BR>
<asp:Label
    id="lblMessage"
    runat="Server"
    Text="Enter Your Name"
/>
<BR><BR>
<asp:button 
    id="butOK"
    text="Check Out"
    Type="Submit"
    OnClick="SubmitBtn_Click" 
    runat="server"
/>
<BR><BR>
</Font>
</Form>
</BODY>
</HTML>
--%>

Store your Object in Session (C#)

<%@ Page language="c#" src="SessionStateExample.aspx.cs" AutoEventWireup="false" Inherits="SessionStateExample" %>
<HTML>
  <body>
    <form id="Form1" method="post" runat="server">
      <asp:Label id="lblSession" style="Z-INDEX: 101; LEFT: 24px; POSITION: absolute; TOP: 32px" runat="server" Width="232px" Height="61px" Font-Size="Medium" Font-Names="Verdana" Font-Bold="True"></asp:Label>
      <DIV style="BORDER-RIGHT: 2px groove; BORDER-TOP: 2px groove; Z-INDEX: 105; LEFT: 16px; BORDER-LEFT: 2px groove; WIDTH: 576px; BORDER-BOTTOM: 2px groove; POSITION: absolute; TOP: 248px; HEIGHT: 160px; BACKGROUND-COLOR: lightyellow" ms_positioning="GridLayout">
        <asp:ListBox id="lstItems" style="Z-INDEX: 106; LEFT: 16px; POSITION: absolute; TOP: 16px" runat="server" Width="208px" Height="128px"></asp:ListBox>
        <asp:Button id="cmdMoreInfo" style="Z-INDEX: 106; LEFT: 248px; POSITION: absolute; TOP: 24px" runat="server" Width="120px" Height="24px" Text="More Information"></asp:Button>
        <asp:Label id="lblRecord" style="Z-INDEX: 106; LEFT: 248px; POSITION: absolute; TOP: 64px" runat="server" Width="272px" Height="61px" Font-Size="X-Small" Font-Names="Verdana" Font-Bold="True"></asp:Label></DIV>
    </form>
  </body>
</HTML>

<%--
using System;
using System.Collections;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
  public class SessionStateExample : System.Web.UI.Page
  {
    protected System.Web.UI.WebControls.Label lblSession;
    protected System.Web.UI.WebControls.ListBox lstItems;
    protected System.Web.UI.WebControls.Button cmdMoreInfo;
    protected System.Web.UI.WebControls.Label lblRecord;
  
    private void Page_Load(object sender, System.EventArgs e)
    {
      if (!this.IsPostBack)
      {
        // Create Product objects.
        Product piece1 = new Product("Econo Sofa", 
          "Acme Inc.", 7.9M);
        Product piece2 = new Product("Pioneer Table", 
          "Heritage Unit", 8.7M);
        Product piece3 = new Product("Retro Cabinet", 
          "Sixties Ltd.", 3.1M);
        // Add objects to session state.
        Session["Product1"] = piece1;
        Session["Product2"] = piece2;
        Session["Product3"] = piece3;
        // Add rows to list control.
        lstItems.Items.Clear();
        lstItems.Items.Add(piece1.Name);
        lstItems.Items.Add(piece2.Name);
        lstItems.Items.Add(piece3.Name);
      }
      // Display some basic information about the session.
      // This is useful for testing configuration settings.
      lblSession.Text = "Session ID: " + Session.SessionID;
      lblSession.Text += "<br>Number of Objects: ";
      lblSession.Text += Session.Count.ToString();
      lblSession.Text += "<br>Mode: " + Session.Mode.ToString();
      lblSession.Text += "<br>Is Cookieless: ";
      lblSession.Text += Session.IsCookieless.ToString();
      lblSession.Text += "<br>Is New: ";
      lblSession.Text += Session.IsNewSession.ToString();
      lblSession.Text += "<br>Timeout (minutes): ";
      lblSession.Text += Session.Timeout.ToString();
    }
    #region Web Form Designer generated code
    override protected void OnInit(EventArgs e)
    {
      //
      // CODEGEN: This call is required by the ASP.NET Web Form Designer.
      //
      InitializeComponent();
      base.OnInit(e);
    }
    
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {    
      this.cmdMoreInfo.Click += new System.EventHandler(this.cmdMoreInfo_Click);
      this.Load += new System.EventHandler(this.Page_Load);
    }
    #endregion
    private void cmdMoreInfo_Click(object sender, System.EventArgs e)
    {
      if (lstItems.SelectedIndex == -1)
      {
        lblRecord.Text = "No item selected.";
      }
      else
      {
        // Construct the right key name based on the index.
        string key = "Product" +
          (lstItems.SelectedIndex + 1).ToString();
        // Retrieve the Product object from session state.
        Product piece = (Product)Session[key];
        // Display the information for this object.
        lblRecord.Text = "Name: " + piece.Name;
        lblRecord.Text += "<br>Manufacturer: ";
        lblRecord.Text +=  piece.Description;
        lblRecord.Text += "<br>Cost: $" + piece.Cost.ToString();
      }
    }
  }

  public class Product
  {
    public string Name;
    public string Description;
    public decimal Cost;
    public Product(string name, string description, 
      decimal cost)
    {
      Name = name;
      Description = description;
      Cost = cost;
    }
  }


--%>

Use Session item (VB.net)

<%@ Page Language="vb" %>
<html>
   <head>
      <script runat="server">
         Sub Page_Load()
            Session.Item("foo") = "foo"
            Session.Item("foo2") = "foo2"
            Message.Text = Session.Item("foo") & "</br>"
            Message.Text &= Session.Item(1)
         End Sub
      </script>
   </head>
<body>
   <asp:label id="Message" runat="server"/>
</body>
</html>

Use session to store action time (VB.net)

<%@ Page Language="VB" %>
<script runat="server">
    Sub Page_Load()
        If Not Page.IsPostBack Then
            ResetStartTime()
        End If
    End Sub
    
    Protected Sub btnAgain_Click(ByVal sender As Object, ByVal e As System.EventArgs)
        ResetStartTime()
    End Sub
    
    Sub ResetStartTime()
        Session("StartTime") = DateTime.Now
    End Sub
    
    
    Protected Sub valAnswer_ServerValidate(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs)
        Dim startTime As DateTime = CType(Session("StartTime"), DateTime)
        If startTime.AddSeconds(5) > DateTime.Now Then
            args.IsValid = True
        Else
            args.IsValid = False
        End If
    End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Timed Test</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <p>
    You have 5 seconds to answer the following question:
    </p>
    
    <asp:Label
        id="lblQuestion"
        Text="What was Aristotle"s first name?"
        AssociatedControlID="txtAnswer"
        Runat="server" />
    <br />
    <asp:TextBox
        id="txtAnswer"
        Runat="server" />    
    <asp:CustomValidator
        id="valAnswer"
        Text="(You answered too slowly!)"
        OnServerValidate="valAnswer_ServerValidate"
        Runat="server"  />
    
    <br /><br />
    
    <asp:Button
        id="btnSubmit"
        Text="Submit"
        Runat="server" />
    
    <asp:Button
        id="btnAgain"
        Text="Try Again!"
        CausesValidation="false"
        OnClick="btnAgain_Click"
        Runat="server" />
    
    </div>
    </form>
</body>
</html>

Use session variables (VB.net)

<%@ Page language="VB"%>
<script language="vb" runat="server">
  Sub EmptyClick(sender As System.Object, e As System.EventArgs)
    Session("BasketCount") = 0
  End Sub
  Sub AddClick(sender As System.Object, e As System.EventArgs)
    Session("BasketCount") += 1
  End Sub
</script>
<html>
  <body>
    <form id="BasketForm" method="post" runat="server">
      <asp:Button id="Empty" OnClick="EmptyClick" runat="server" Text="Empty"/>
      <br />
      <asp:Button id="Add" OnClick="AddClick" runat="server" Text="Add"/>
      <br />
      Basket items : <%=Session("BasketCount")%>
      <br />
    </form>
  </body>
</html>

Write value to session (VB.net)

<%@ Page Language="vb" %>
<html>
   <head>
      <title>Writing to Session in ASP.NET</title>
      <script runat="server">
         Sub Page_Load()
            Session("foo") = "Hello, World!"
            Message.Text = "Wrote the value "Hello, World" to a Session item named "foo"."
         End Sub
      </script>
   </head>
<body>
   <asp:label id="Message" runat="server"/>
</body>
</html>

ASP.Net/Session Cookie/Session Variables — различия между версиями

Текущая версия на 11:53, 26 мая 2010

Содержание

Add and get value from session (VB.net)

Clear session values (VB.net)

Copy session values (VB.net)

Get all session keys (VB.net)

Get Cookie value and assign to the label in C#

Get Cookie value (C#)

Get session code page in VB (VB.net)

Get value from session in cross page posting (C#)

Get value from session in cross page posting(VB)

Pass variables between pages (VB.net)

Pass variables with & sign (VB.net)

Remove all session content (VB.net)

Remove all session values (VB.net)

Remove session value by index (VB.net)

Remove value from session value (VB.net)

Session get Message (C#)

Session item count (VB.net)

Session Set message (C#)

Setting values in session state (C#)

Setting values in session state (VB)

Simple session data: set and retrieve

Store your Object in Session (C#)

Use Session item (VB.net)

Use session to store action time (VB.net)

Use session variables (VB.net)

Write value to session (VB.net)

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Текущая версия на 11:53, 26 мая 2010 (просмотреть исходный код) Admin (обсуждение \| вклад) м (1 версия)	Текущая версия на 11:53, 26 мая 2010 (просмотреть исходный код) Admin (обсуждение \| вклад) м (1 версия)
(нет различий)