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ViewCollection(Control) Constructor

  • Reference

Definition

Namespace:
System.Web.UI.WebControls
Assembly:
System.Web.dll

Initializes a new instance of the ViewCollection class.

public:
 ViewCollection(System::Web::UI::Control ^ owner);
public ViewCollection (System.Web.UI.Control owner);
new System.Web.UI.WebControls.ViewCollection : System.Web.UI.Control -> System.Web.UI.WebControls.ViewCollection
Public Sub New (owner As Control)

Parameters

owner
Control

The MultiView control that owns this collection of child controls.

Examples

The following code example demonstrates how to programmatically add View controls to a MultiView control. After each View control is created, the AddAt method is used to add the View control to the ViewCollection collection of the MultiView control at the specified index. The Item[] indexer is used to access the ID properties of the View controls stored in the ViewCollection collection and display them to the user.

<%@ Page Language="VB"%>
<!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>
    <title>ViewCollection example</title>
<script runat="server">
      
        Sub Button1_Click(ByVal Sender As Object, ByVal e As EventArgs)
            ' Create a MultiView control.
            Dim MultiView1 As New MultiView

            ' Create a ViewCollection for the View 
            ' controls contained in MultiView1.
            Dim myViewCollection As New ViewCollection(MultiView1)

            ' Create a View control. 
            Dim View1 As New View
            ' Use a helper function to create the view.
            View1 = CreateView("View1")
            ' Add View1 to myViewCollection at index 0.
            myViewCollection.AddAt(0, View1)

            ' Create a second View control and 
            ' add it to myViewCollection at index 1.
            Dim View2 As New View
            View2 = CreateView("View2")
            myViewCollection.AddAt(1, View2)

            ' Create a third View control and 
            ' add it to myViewCollection at index 0.
            ' Inserting View3 at index 0 
            ' causes View1 to move to index 1  
            ' and View2 to move to index 2.
            Dim View3 As New View
            View3 = CreateView("View3")
            myViewCollection.AddAt(0, View3)

            ' Show the contents of myViewCollection on the page.
            DisplayViewCollectionContents(myViewCollection)
            
        End Sub

        ' A function to programmatically create a View control.
        Private Function CreateView(ByVal viewId As String) As View
            ' Create a View control
            Dim myView As New View
            myView.ID = viewId

            ' Create a Panel control.
            Dim Panel1 As New Panel

            ' Set the style properties for Panel1.
            Panel1.Height = New Unit(150)
            Panel1.Width = New Unit(150)
            Panel1.BackColor = System.Drawing.Color.Azure
            Panel1.BorderStyle = BorderStyle.Double

            ' Add Panel1 to the Controls collection
            ' of the View control.
            myView.Controls.Add(Panel1)

            ' Create a Label control.
            Dim Label1 As New Label

            ' Set the properties for Label1.
            Label1.Text = "This is " + CStr(myView.ID)

            ' Add Label1 to the Controls collection
            ' of the Panel1 control.
            Panel1.Controls.Add(Label1)

            Return myView
        End Function

        ' A sub-routine to display the contents of myViewCollection.
        Sub DisplayViewCollectionContents(ByVal collection As ViewCollection)
            ' Use the Item property to access the ID of the View
            ' control at the specified index in the collection.
            Label1.Text = "The view at index 0 is " + collection.Item(0).ID
            Label2.Text = "The view at index 1 is " + collection.Item(1).ID
            Label3.Text = "The view at index 2 is " + collection.Item(2).ID
        End Sub

</script>
 
</head>
<body>

    <form id="Form1" runat="server">

        <h3>ViewCollection example</h3> 

        <asp:Button id="Button2" 
            Text="Show ViewCollection contents" 
            OnClick="Button1_Click" 
            runat="Server"/>
        <br /><br />  
        
        <hr />
  
        <asp:Label ID="Label1"
            runat="Server">
        </asp:Label><br /><br /> 

        <asp:Label ID="Label2"
            runat="Server">
        </asp:Label><br /><br />

        <asp:Label ID="Label3"
            runat="Server">
        </asp:Label><br /><br /> 
       
    </form>
   
</body>
</html>

Applies to

See also