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

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Версия 15:30, 26 мая 2010

Add new name value pair to the Application (VB.net)

<%@ Page Language="vb" %>
<html>
   <head>
      <script runat="server">
         Sub Page_Load()
      Application.Add("Added", "AddedValue")
      Message.Text = Application("added")
         End Sub
      </script>
   </head>
<body>
   <asp:label id="Message" runat="server"/>
</body>
</html>



All application variables (VB.net)

<%@ Page Language=VB Debug=true %>
<script runat=server>
Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
    Dim I as Integer
    lblMessage.Text = "All Application variables:<BR>"
    For I = 0 to Application.Count - 1
        lblMessage.Text = lblMessage.Text _
            & Application.GetKey(I) & ": " _
            & Application(I) & "<BR>"
    Next
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Application Variables</TITLE>
</HEAD>
<form runat="server">
<asp:label 
    id="lblMessage" 
    font-size="12pt"
    font-name="Tahoma"
    runat="server"
    text="Please provide your name."
/>
</form>
</BODY>
</HTML>



Application.AllKeys (VB.net)

<%@ Page Language="vb" %>
<html>
   <head>
      <script runat="server">
         Sub Page_Load()
      Dim I as Integer
      Dim StateVars(Application.Count) As String
      StateVars = Application.AllKeys
      For I = 0 to StateVars.Length - 1 
    Message.Text = Message.Text + StateVars(I) + "<br/>"
      Next I
         End Sub
      </script>
   </head>
<body>
   <asp:label id="Message" runat="server"/>
</body>
</html>



Application.Clear() (VB.net)

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



Application.Count before and after variable setting (VB.net)

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



Application.Count (VB.net)

<%@ Page Language="vb" %>
<html>
   <head>
      <script runat="server">
         Sub Page_Load()
      Dim I as Integer
      Dim StateVars(Application.Count) As String
      StateVars = Application.AllKeys
      For I = 0 to StateVars.Length - 1 
    Message.Text = Message.Text + StateVars(I) + "<br/>"
      Next I
         End Sub
      </script>
   </head>
<body>
   <asp:label id="Message" runat="server"/>
</body>
</html>



Application: GetKey (VB.net)

<%@ Page Language="vb" %>
<html>
   <head>
      <script runat="server">
  Sub Page_Load()
     Application.RemoveAll()
     Application("GetKeyTest") = "Got it!"
           Message.Text = "Key of Application(0) = " & Application.GetKey(0) & _
    "<br/>(Should be GetKeyTest)"
  End Sub
      </script>
   </head>
<body>
   <asp:label id="Message" runat="server"/>
</body>
</html>



Application.Item by index (VB.net)

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



Application.Item by kay (VB.net)

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



Application(I) (VB.net)

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



Application.Lock() and unLock() (VB.net)

<%@ Page Language="vb" %>
<html>
   <head>
      <script runat="server">
  Sub Page_Load()
     Application.Lock()
     Application("Counter") = Application("Counter") + 1
     Application.UnLock()
     Message.Text = "Counter = " & Application("ounter") 
  End Sub
      </script>
   </head>
<body>
   <asp:label id="Message" runat="server"/>
</body>
</html>



Application property example (VB.net)

<%@ Page Language="vb" Strict="True" %>
<html>
   <head>
      <title>Application property example</title>
      <script runat="server">
         Sub Page_Load()
            Application("Name") = "John Doe"
            Message.Text = "The value <em>" & CStr(Application("Name")) & _
               "</em> has been added to the Application collection."
         End Sub
      </script>
   </head>
<body>
   <asp:label id="Message" runat="server"/>
</body>
</html>



Application.RemoveAll() (VB.net)

<%@ Page Language="vb" %>
<html>
   <head>
      <script runat="server">
  Sub Page_Load()
     Application.RemoveAll()
     Application("GetKeyTest") = "Got it!"
           Message.Text = "Key of Application(0) = " & Application.GetKey(0) & _
    "<br/>(Should be GetKeyTest)"
  End Sub
      </script>
   </head>
<body>
   <asp:label id="Message" runat="server"/>
</body>
</html>



Application Remove At (VB.net)

<%@ Page Language="vb" %>
<html>
   <head>
      <script runat="server">
  Sub Page_Load()
     If Application.Count > 0 Then
        Application.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>
   <asp:label id="Message" runat="server"/>
</body>
</html>



Application.Remove (VB.net)

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



Application Set (VB.net)

<%@ Page Language="vb" %>
<html>
   <head>
      <script runat="server">
         Sub Page_Load()
           Application.RemoveAll()
         Application.Set("TotallyNewVariable","Test!")
         Message.Text = "First: " + Application("TotallyNewVariable") + "<br/>"
         Application.Set("TotallyNewVariable","Test again!")
         Message.Text = Message.Text & "First after Set: " + _ 
       Application("TotallyNewVariable") + "<br/>"
         End Sub
      </script>
   </head>
<body>
   <asp:label id="Message" runat="server"/>
</body>
</html>



Application state

<%@ Page language="c#" src="ApplicationState.aspx.cs" AutoEventWireup="false" Inherits="WebForm1" %>
<html>
  <body>
  
    <form id="Form1" method="post" runat="server">
    <h1>Application State page</h1>
    </form>
  
  </body>
</html>

<%-- ApplicationState.aspx.cs
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 WebForm1 : System.Web.UI.Page
  {
    private void Page_Load(object sender, System.EventArgs e)
    {
      Application.Lock();
      if (Application[Request.Browser.Browser] != null)
        Application[Request.Browser.Browser] = (int)Application[Request.Browser.Browser] + 1;
      else
        Application[Request.Browser.Browser] = 1;
      Application.UnLock();
      for (int i=0; i<Application.Count; i++)
        Response.Output.Write("<p>{0} : {1} hits</p>", Application.GetKey(i), Application[i]);
    }
    #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.Load += new System.EventHandler(this.Page_Load);
    }
    #endregion
  }

--%>



Application.StaticObjects (VB.net)

<%@ Page Language="vb" %>
<html>
   <head>
      <script runat="server">
         Sub Page_Load()
     Message.Text = "There are " & Application.StaticObjects.Count & _
        " objects declared with the " & _
        "&lt;object runat=&quot;server&quot;&gt; syntax in Application scope."
     Dim myobj As Object
     For Each myObj in Application.StaticObjects
        If myObj.Value.GetType.ToString() = _
           "System.Web.UI.WebControls.TextBox" Then
           Page.Controls.Add(myObj.Value)
        End If
     Next
         End Sub
      </script>
   </head>
<body>
   <asp:label id="Message" runat="server"/>
</body>
</html>



For Each Key in Application.Keys (VB.net)

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



Get variables from global.asax (VB.net)

<%@ Page Language=VB Debug=true %>
<script runat=server>
Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
    lblAppName.Text = Application("ApplicationName")
    lblAppName.ForeColor = System.Drawing.Color.FromName _
        (Application("FontColor"))
    lblMessage.ForeColor = System.Drawing.Color.FromName _
        (Application("FontColor"))
End Sub
Sub SubmitBtn_Click(Sender As Object, E As EventArgs)
    lblMessage.Text = FormatCurrency(txtOrderTotal.Text * _
        Application("ShippingCharge"))
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Coding the Application_OnStart Event</TITLE>
</HEAD>
<form runat="server">
<asp:label 
    id="lblAppName"
    font-size="14"
    runat="server"
/>
<BR><BR>
<asp:label 
    id="lblMessage"
    runat="server"
    text="Enter your order total to 
        see the shipping charge"
/>
<BR><BR>
<asp:textbox 
    id="txtOrderTotal" 
    columns="25"
    maxlength="30"
    runat=server 
/>
<BR><BR>
<asp:button 
    id="butOK"
    text="  OK  "
    onclick="SubmitBtn_Click" 
    runat="server"
/>
</Form>
</BODY>
</HTML>
<%--
<%@ Import Namespace="System.Diagnostics" %>
<%@ Import Namespace="System.Data.OLEDB" %>
<SCRIPT LANGUAGE="VB" RUNAT="Server">
Sub Application_OnStart()
    Application("TaxRate") = 0.5125
    Application("appConn") = New OleDbConnection( _
        "PROVIDER=Microsoft.Jet.OLEDB.4.0;" _
        & "DATA SOURCE=" & Server.MapPath _
        ("EmployeeDatabase.mdb;"))
    Application("ApplicationName") = "My Site"
    Application("FontColor") = "Red"
    Application("ShippingCharge") = .03
End Sub
Sub Application_OnEnd()
"    Dim MyLog as New EventLog
 "   MyLog.Log = "Application"
  "  MyLog.Source = "My Test ASP.NET Application"
   " MyLog.WriteEntry("The application ended at " _
    "    & Now() & ".")
End Sub
Sub Session_OnStart()
    Application("SessionStarts") = Application("SessionStarts") + 1
    Session.TimeOut = 1
"    Session("TheEventLog") = New EventLog
 "   Session("TheEventLog").Log = "Application"
  "  Application.Lock
    Application("TotalUsers") = Application("TotalUsers") _
        + 1
    Application.Unlock
    "If Len(Session("WhenEntered")) = 0 Then
    "    Response.Redirect("welcome.aspx")
    "    Session("WhenEntered") = Now()
    "End If
End Sub
Sub Session_OnEnd()
    Dim MyLog as New EventLog
    MyLog.Log = "Application"
    MyLog.Source = "A session that started on " _
        & Session("WhenEntered") & " ended at " _
        & Now()
    Application("SessionStops") = _
        Application("SessionStops") + 1
        
End Sub
"Sub Application_Error(Sender as Object, e as EventArgs)
"    Response.Redirect("errorshappen.aspx")
"End Sub
</SCRIPT>
--%>


<A href="http://www.nfex.ru/Code/ASPDownload/EmployeeDatabase.zip">EmployeeDatabase.zip( 10 k)</a>


Give a Application a new value (VB.net)

<%@ Page Language="vb" %>
<html>
   <head>
      <script runat="server">
  Sub Page_Load()
     Application("GetTest") = "Got it!"
        Message.Text = "GetTest = " & Application.Get("GetTest")
  End Sub
      </script>
   </head>
<body>
   <asp:label id="Message" runat="server"/>
</body>
</html>



Set Application key value pair (VB.net)

<%@ Page Language="VB" %>
<html>
  <body>
    <%
    Application("CompanyTelephone") = "555 1234"
    %>
    <b>Application state changed successfully</b>
    <b>Company Telephone = <% Response.Write(Application("CompanyTelephone")) %>
  </body>
</html>



Store key value pair for entire application (C#)

<%@ Page Language="c#" %>
<html>
  <body>
    <% Application["CompanyTelephone"] = "555 1234"; %>
    <b>Application state changed successfully</b>
  </body>
</html>

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

<html>
  <body>
    <b>Company Telephone = <% Response.Write(Application("CompanyTelephone")) %>
    </b>
  </body>
</html>
Источник — «http://nfex.ru/index.php?title=ASP.Net/Session_Cookie/Application&oldid=2337»