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Publisher19.3 Collections Reference
| Contents |
HttpSessionState = Session.Contents |
Parameter
- HttpSessionState
A variable of type HttpSessionState that will receive the Contents
reference.
Example
The example below calls the RemoveAll method through the Contents
collection reference and then writes a message:
Sub Page_Load( )
Session.Contents.RemoveAll( )
Message.Text = "Removed all items from current Session."
End Sub
Notes
This property is provided for backward compatibility with classic
ASP. Properties such as the Item property and methods such as Remove
and RemoveAll were accessed via the Contents property in classic ASP.
In new ASP.NET development, you should access these members directly.
| Keys |
KeysCollection = Session.Keys |
string keys associated with all of the values stored in the Session
collection.
Parameter
- KeysCollection
A variable of type NameObjectCollectionBase.KeysCollection that will
receive the Keys property value.
Example
The example loops through the collection of keys in the Session
collection and then displays the key name and the value associated
with it by using the Text property of the Message label control:
Sub Page_Load( )
Dim Key As String
Message.Text = "Session Keys:"
For Each Key in Session.Keys
Message.Text &= "<br/>Key: " & Key
Message.Text &= "<br/>Value: " & _
CStr(Session(Key))
Next
End Sub
Notes
The Keys property provides one of many ways to iterate over the
contents of the Session collection.
| StaticObjects |
HttpStaticObjectsCollection = Session.StaticObjects |
instantiated in global.asax by using the
<object runat="server">
syntax whose scope is set to Session.
Parameter
- HttpStaticObjectsCollection
A variable of type HttpStaticObjectsCollection that will receive the
StaticObjects property value.
Example
The example uses the Count property of the
HttpStaticObjectsCollection class to display the
number of objects in the current application declared with the
<object scope="session"
runat="server"/> syntax in
global.asax . It then checks the type of each
object and, if it is a TextBox web control, adds it to the Controls
collection of the form:
Sub Page_Load( )
Message.Text = "There are " & Session.StaticObjects.Count & _
" objects declared with the " & _
"<object runat="server"> syntax in Session scope."
Dim myobj As Object
For Each myObj in Session.StaticObjects
If myObj.Value.GetType.ToString( ) = _
"System.Web.UI.WebControls.TextBox" Then
myForm.Controls.Add(myObj.Value)
End If
Next
End Sub
You also need to modify the <body> section
of the document as follows:
<body>
<form id="myForm" runat="server">
<asp:label id="Message" runat="server"/>
</form>
</body>
Notes
This property is provided for backward compatibility with classic
ASP. You should think carefully before instantiating objects with
Session or Application scope because of the impact such objects have
on resource usage and application scalability. In most cases, it is
advisable to limit objects to page scope.Each object in the collection is represented by the DictionaryEntry
structure, so its key and value are not directly accessible. To
access the key and/or value, use the Key and/or Value members of the
DictionaryEntry structure, as shown in the example.
