CatalogZoneBase Class

Definition

public ref class CatalogZoneBase abstract : System::Web::UI::WebControls::WebParts::ToolZone, System::Web::UI::IPostBackDataHandler

public abstract class CatalogZoneBase : System.Web.UI.WebControls.WebParts.ToolZone, System.Web.UI.IPostBackDataHandler

type CatalogZoneBase = class
    inherit ToolZone
    interface IPostBackDataHandler

Public MustInherit Class CatalogZoneBase
Inherits ToolZone
Implements IPostBackDataHandler

Inheritance

Object

Control

WebControl

CompositeControl

WebZone

ToolZone

CatalogZoneBase

Derived

System.Web.UI.WebControls.WebParts.CatalogZone

Implements

IPostBackDataHandler

Examples

The following code example demonstrates several declarative and programmatic uses of the CatalogZoneBase class. Because the class is abstract, the code examples use the derived CatalogZone class that ships with the Web Parts control set, demonstrating the properties and methods that it inherits from the CatalogZoneBase class.

The code example has four parts:

• A user control that enables you to change display modes on the Web page.

• A Web page that contains a reference to a CatalogZone control, and some code that demonstrates usage of some key CatalogZoneBase class members.

• A custom WebPart control that is added to the custom CatalogZone control.

• A description of how the example works in a browser.

The first part of this code example is the user control that enables you to change display modes on the page. For details about display modes and a description of the source code in this control, see Walkthrough: Changing Display Modes on a Web Parts Page.

<%@ control language="C#" classname="DisplayModeMenuCS"%>
<script runat="server">
  
 // Use a field to reference the current WebPartManager.
  WebPartManager _manager;

  void Page_Init(object sender, EventArgs e)
  {
    Page.InitComplete += new EventHandler(InitComplete);
  }  

  void InitComplete(object sender, System.EventArgs e)
  {
    _manager = WebPartManager.GetCurrentWebPartManager(Page);

    String browseModeName = WebPartManager.BrowseDisplayMode.Name;

    // Fill the dropdown with the names of supported display modes.
    foreach (WebPartDisplayMode mode in _manager.SupportedDisplayModes)
    {
      String modeName = mode.Name;
      // Make sure a mode is enabled before adding it.
      if (mode.IsEnabled(_manager))
      {
        ListItem item = new ListItem(modeName, modeName);
        DisplayModeDropdown.Items.Add(item);
      }
    }

    // If shared scope is allowed for this user, display the scope-switching
    // UI and select the appropriate radio button for the current user scope.
    if (_manager.Personalization.CanEnterSharedScope)
    {
      Panel2.Visible = true;
      if (_manager.Personalization.Scope == PersonalizationScope.User)
        RadioButton1.Checked = true;
      else
        RadioButton2.Checked = true;
    }
    
  }
 
  // Change the page to the selected display mode.
  void DisplayModeDropdown_SelectedIndexChanged(object sender, EventArgs e)
  {
    String selectedMode = DisplayModeDropdown.SelectedValue;

    WebPartDisplayMode mode = _manager.SupportedDisplayModes[selectedMode];
    if (mode != null)
      _manager.DisplayMode = mode;
  }

  // Set the selected item equal to the current display mode.
  void Page_PreRender(object sender, EventArgs e)
  {
    ListItemCollection items = DisplayModeDropdown.Items;
    int selectedIndex = 
      items.IndexOf(items.FindByText(_manager.DisplayMode.Name));
    DisplayModeDropdown.SelectedIndex = selectedIndex;
  }

  // Reset all of a user's personalization data for the page.
  protected void LinkButton1_Click(object sender, EventArgs e)
  {
    _manager.Personalization.ResetPersonalizationState();
  }

  // If not in User personalization scope, toggle into it.
  protected void RadioButton1_CheckedChanged(object sender, EventArgs e)
  {
    if (_manager.Personalization.Scope == PersonalizationScope.Shared)
      _manager.Personalization.ToggleScope();
  }

  // If not in Shared scope, and if user is allowed, toggle the scope.
  protected void RadioButton2_CheckedChanged(object sender, EventArgs e)
  {
    if (_manager.Personalization.CanEnterSharedScope && 
        _manager.Personalization.Scope == PersonalizationScope.User)
      _manager.Personalization.ToggleScope();
  }
</script>
<div>
  <asp:Panel ID="Panel1" runat="server" 
    Borderwidth="1" 
    Width="230" 
    BackColor="lightgray"
    Font-Names="Verdana, Arial, Sans Serif" >
    <asp:Label ID="Label1" runat="server" 
      Text="&nbsp;Display Mode" 
      Font-Bold="true"
      Font-Size="8"
      Width="120" 
      AssociatedControlID="DisplayModeDropdown"/>
    <asp:DropDownList ID="DisplayModeDropdown" runat="server"  
      AutoPostBack="true" 
      Width="120"
      OnSelectedIndexChanged="DisplayModeDropdown_SelectedIndexChanged" />
    <asp:LinkButton ID="LinkButton1" runat="server"
      Text="Reset User State" 
      ToolTip="Reset the current user's personalization data for the page."
      Font-Size="8" 
      OnClick="LinkButton1_Click" />
    <asp:Panel ID="Panel2" runat="server" 
      GroupingText="Personalization Scope"
      Font-Bold="true"
      Font-Size="8" 
      Visible="false" >
      <asp:RadioButton ID="RadioButton1" runat="server" 
        Text="User" 
        AutoPostBack="true"
        GroupName="Scope" OnCheckedChanged="RadioButton1_CheckedChanged" />
      <asp:RadioButton ID="RadioButton2" runat="server" 
        Text="Shared" 
        AutoPostBack="true"
        GroupName="Scope" 
        OnCheckedChanged="RadioButton2_CheckedChanged" />
    </asp:Panel>
  </asp:Panel>
</div>

<%@ control language="vb" classname="DisplayModeMenuVB"%>
<script runat="server">
  ' Use a field to reference the current WebPartManager.
  Dim _manager As WebPartManager

  Sub Page_Init(ByVal sender As Object, ByVal e As EventArgs)
    AddHandler Page.InitComplete, AddressOf InitComplete
  End Sub

  Sub InitComplete(ByVal sender As Object, ByVal e As System.EventArgs)
    _manager = WebPartManager.GetCurrentWebPartManager(Page)
      
    Dim browseModeName As String = WebPartManager.BrowseDisplayMode.Name
      
    ' Fill the dropdown with the names of supported display modes.
    Dim mode As WebPartDisplayMode
    For Each mode In _manager.SupportedDisplayModes
      Dim modeName As String = mode.Name
      ' Make sure a mode is enabled before adding it.
      If mode.IsEnabled(_manager) Then
        Dim item As New ListItem(modeName, modeName)
        DisplayModeDropdown.Items.Add(item)
      End If
    Next mode
      
    ' If shared scope is allowed for this user, display the scope-switching
    ' UI and select the appropriate radio button for the current user scope.
    If _manager.Personalization.CanEnterSharedScope Then
      Panel2.Visible = True
      If _manager.Personalization.Scope = PersonalizationScope.User Then
        RadioButton1.Checked = True
      Else
        RadioButton2.Checked = True
      End If
    End If
   
  End Sub

  ' Change the page to the selected display mode.
  Sub DisplayModeDropdown_SelectedIndexChanged(ByVal sender As Object, _
    ByVal e As EventArgs)
    
    Dim selectedMode As String = DisplayModeDropdown.SelectedValue   
    Dim mode As WebPartDisplayMode = _
      _manager.SupportedDisplayModes(selectedMode)
    If Not (mode Is Nothing) Then
      _manager.DisplayMode = mode
    End If

  End Sub
   
  ' Set the selected item equal to the current display mode.
  Sub Page_PreRender(ByVal sender As Object, ByVal e As EventArgs)
    Dim items As ListItemCollection = DisplayModeDropdown.Items
    Dim selectedIndex As Integer = _
      items.IndexOf(items.FindByText(_manager.DisplayMode.Name))
    DisplayModeDropdown.SelectedIndex = selectedIndex

  End Sub

  ' Reset all of a user's personalization data for the page.
  Protected Sub LinkButton1_Click(ByVal sender As Object, _
    ByVal e As EventArgs)
    
    _manager.Personalization.ResetPersonalizationState()
    
  End Sub

  ' If not in User personalization scope, toggle into it.
  Protected Sub RadioButton1_CheckedChanged(ByVal sender As Object, _
    ByVal e As EventArgs)
    
    If _manager.Personalization.Scope = PersonalizationScope.Shared Then
      _manager.Personalization.ToggleScope()
    End If

  End Sub
   
  ' If not in Shared scope, and if user is allowed, toggle the scope.
  Protected Sub RadioButton2_CheckedChanged(ByVal sender As Object, _
    ByVal e As EventArgs)
    
    If _manager.Personalization.CanEnterSharedScope AndAlso _
      _manager.Personalization.Scope = PersonalizationScope.User Then
      _manager.Personalization.ToggleScope()
    End If

  End Sub

</script>
<div>
  <asp:Panel ID="Panel1" runat="server" 
    Borderwidth="1" 
    Width="230" 
    BackColor="lightgray"
    Font-Names="Verdana, Arial, Sans Serif" >
    <asp:Label ID="Label1" runat="server" 
      Text="&nbsp;Display Mode" 
      Font-Bold="true"
      Font-Size="8"
      Width="120" 
      AssociatedControlID="DisplayModeDropdown"/>
    <asp:DropDownList ID="DisplayModeDropdown" runat="server"  
      AutoPostBack="true" 
      Width="120"
      OnSelectedIndexChanged="DisplayModeDropdown_SelectedIndexChanged" />
    <asp:LinkButton ID="LinkButton1" runat="server"
      Text="Reset User State" 
      ToolTip="Reset the current user's personalization data for the page."
      Font-Size="8" 
      OnClick="LinkButton1_Click" />
    <asp:Panel ID="Panel2" runat="server" 
      GroupingText="Personalization Scope"
      Font-Bold="true"
      Font-Size="8" 
      Visible="false" >
      <asp:RadioButton ID="RadioButton1" runat="server" 
        Text="User" 
        AutoPostBack="true"
        GroupName="Scope" OnCheckedChanged="RadioButton1_CheckedChanged" />
      <asp:RadioButton ID="RadioButton2" runat="server" 
        Text="Shared" 
        AutoPostBack="true"
        GroupName="Scope" 
        OnCheckedChanged="RadioButton2_CheckedChanged" />
    </asp:Panel>
  </asp:Panel>
</div>

The second part of the code example is a Web page that contains a declarative reference to a CatalogZone control. Near the top of the page are two Register directives--one for the user control, and one for the custom WebPart control. Notice that below the <asp:WebPartZone> element is an <asp: CatalogZone> element that contains declarative references to the custom WebPart control, and to an ASP.NET Calendar control. The zone also has a variety of tags and properties set to determine its appearance and behavior. Between the <script> tags in the page is a variety of event-handling code, most of which demonstrates the various programmatic uses of the CatalogZoneBase members.

<%@ page language="c#" %>
<%@ register TagPrefix="uc1" 
  TagName="DisplayModeMenuCS" 
  Src="DisplayModeMenucs.ascx" %>
<%@ register tagprefix="aspSample" 
  Namespace="Samples.AspNet.CS.Controls" 
  Assembly="TextDisplayWebPartCS" %>
  
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  WebPartManager manager;

  protected void WebPartManager1_DisplayModeChanged(object sender,
    WebPartDisplayModeEventArgs e)
  {
    if (e.OldDisplayMode.Name != "Catalog")
      Panel1.Visible = true;
    else
      Panel1.Visible = false;
  }
  
  // <snippet3>
  protected void Button1_Click(object sender, EventArgs e)
  {
    if (CatalogZone1.AddVerb.Enabled)
    {
      CatalogZone1.AddVerb.Enabled = false;
      CatalogZone1.CloseVerb.Enabled = false;
    }
    else
    {
      CatalogZone1.AddVerb.Enabled = true;
      CatalogZone1.CloseVerb.Enabled = true;
    }
  }
  // </snippet3>

  // <snippet4>
  protected void Button2_Click(object sender, EventArgs e)
  {
    Label1.Text = "<h3>CatalogPart List</h3>";
    foreach(CatalogPart part in CatalogZone1.CatalogParts)
    {
      Label1.Text += part.ID + "<br />";
    }
  }
  // </snippet4>

  // <snippet5>
  protected void Button3_Click(object sender, EventArgs e)
  {
    CatalogZone1.SelectTargetZoneText = "Add to zone";
    CatalogZone1.EmptyZoneText = "Zone is empty";
    CatalogZone1.HeaderText = "My Updated Header";
    CatalogZone1.InstructionText = "My Updated Instructions";
  }
  // </snippet5>

  // <snippet6>
  protected void Button4_Click(object sender, EventArgs e)
  {
    Label1.Text = CatalogZone1.SelectedCatalogPartID;
  }
  // </snippet6>

  // <snippet7>
  protected void Button5_Click(object sender, EventArgs e)
  {
    CatalogZone1.PartLinkStyle.ForeColor = System.Drawing.Color.Red;
    CatalogZone1.SelectedPartLinkStyle.ForeColor = 
      System.Drawing.Color.Blue;
  }
  // </snippet7>

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>
      CatalogZoneBase Example
    </title>
  </head>
  <body>
    <form id="form1" runat="server">
      <asp:webpartmanager id="WebPartManager1" runat="server" 
        OnDisplayModeChanged="WebPartManager1_DisplayModeChanged" />
      <uc1:DisplayModeMenuCS ID="DisplayModeMenu1" runat="server" />
      <asp:webpartzone id="zone1" runat="server">
        <zonetemplate>
          <asp:BulletedList 
            ID="BulletedList1" 
            Runat="server"
            DisplayMode="HyperLink" 
            Title="Favorite Links" >
            <asp:ListItem Value="http://msdn.microsoft.com">
              MSDN
            </asp:ListItem>
            <asp:ListItem Value="http://www.asp.net">
              ASP.NET
            </asp:ListItem>
            <asp:ListItem Value="http://www.msn.com">
              MSN
            </asp:ListItem>
          </asp:BulletedList>
        </ZoneTemplate>        
      </asp:webpartzone>
      <asp:CatalogZone ID="CatalogZone1" runat="server"
        EmptyZoneText="No controls are in the zone."
        HeaderText="My Web Parts Catalog"
        InstructionText="Add Web Parts controls to the zone."
        PartLinkStyle-Font-Italic="true"
        SelectedPartLinkStyle-Font-Bold="true"
        SelectTargetZoneText="Select zone"
        AddVerb-Text="Add Control"
        CloseVerb-Description="Close and return to browse mode." 
        SelectedCatalogPartID="Currently Selected CatalogPart ID.">
        <ZoneTemplate>
          <asp:DeclarativeCatalogPart ID="DeclarativeCatalogPart1" 
            runat="server">
            <WebPartsTemplate>
              <aspSample:TextDisplayWebPart 
                runat="server"   
                id="textwebpart" 
                title = "Text Content WebPart" 
                ExportMode="All"/>  
              <asp:Calendar id="calendar1" runat="server" 
                Title="My Calendar" />               
            </WebPartsTemplate>
          </asp:DeclarativeCatalogPart> 
          <asp:PageCatalogPart ID="PageCatalogPart1" runat="server" />
          <asp:ImportCatalogPart ID="ImportCatalogPart1" runat="server" /> 
        </ZoneTemplate>
      </asp:CatalogZone>
      <hr />
      <asp:CatalogZone ID="CatalogZone2" runat="server"
        BorderWidth="2"
        HeaderText="My Empty CatalogZone"
        EmptyZoneText="No controls are in the zone." />
      <hr />
      <asp:Panel ID="Panel1" runat="server" Visible="false">
        <asp:Button ID="Button1" runat="server" Width="200" 
          Text="Enable or Disable Verbs" 
          OnClick="Button1_Click" />
        <br />
        <asp:Button ID="Button2" runat="server" Width="200" 
          Text="List CatalogParts" OnClick="Button2_Click" />  
        <br />
        <asp:Button ID="Button3" runat="server" Width="200" 
          Text="Set Zone Text Properties" OnClick="Button3_Click" />  
        <br />   
        <asp:Button ID="Button4" runat="server" Width="200" 
          Text="Show Selected CatalogPart ID" OnClick="Button4_Click"  />  
        <br /> 
        <asp:Button ID="Button5" runat="server" Width="200" 
          Text="Change Part Link Styles" OnClick="Button5_Click"  />  
        <br />     
        <asp:Label ID="Label1" runat="server" Text="" /></asp:Panel>
    </form>
  </body>
</html>

<%@ page language="vb" %>
<%@ register TagPrefix="uc1" 
  TagName="DisplayModeMenuVB" 
  Src="DisplayModeMenuvb.ascx" %>
<%@ register tagprefix="aspSample" 
  Namespace="Samples.AspNet.VB.Controls" 
  Assembly="TextDisplayWebPartVB" %>
  
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">


  Dim manager As WebPartManager


  Protected Sub WebPartManager1_DisplayModeChanged(ByVal sender _
    As Object, ByVal e As WebPartDisplayModeEventArgs)
    If e.OldDisplayMode.Name <> "Catalog" Then
      Panel1.Visible = True
    Else
      Panel1.Visible = False
    End If

  End Sub
   
  ' <snippet3>
  Protected Sub Button1_Click(ByVal sender As Object, _
    ByVal e As EventArgs)
    If CatalogZone1.AddVerb.Enabled Then
      CatalogZone1.AddVerb.Enabled = False
      CatalogZone1.CloseVerb.Enabled = False
    Else
      CatalogZone1.AddVerb.Enabled = True
      CatalogZone1.CloseVerb.Enabled = True
    End If

  End Sub
  ' </snippet3>
  
  ' <snippet4>
  Protected Sub Button2_Click(ByVal sender As Object, _
    ByVal e As EventArgs)
    Label1.Text = "<h3>CatalogPart List</h3>"
    Dim part As CatalogPart
    For Each part In CatalogZone1.CatalogParts
      Label1.Text += part.ID + "<br />"
    Next part

  End Sub
  ' </snippet4>
  
  ' <snippet5>
  Protected Sub Button3_Click(ByVal sender As Object, _
    ByVal e As EventArgs)
    CatalogZone1.SelectTargetZoneText = "Add to zone"
    CatalogZone1.EmptyZoneText = "Zone is empty"
    CatalogZone1.HeaderText = "My Updated Header"
    CatalogZone1.InstructionText = "My Updated Instructions"
  End Sub
  ' </snippet5>
  
  ' <snippet6>
  Protected Sub Button4_Click(ByVal sender As Object, _
    ByVal e As EventArgs)
    Label1.Text = CatalogZone1.SelectedCatalogPartID
  End Sub
  ' </snippet6>
  
  ' <snippet7>
  Protected Sub Button5_Click(ByVal sender As Object, _
    ByVal e As EventArgs)
    CatalogZone1.PartLinkStyle.ForeColor = _
      System.Drawing.Color.Red
    CatalogZone1.SelectedPartLinkStyle.ForeColor = _
      System.Drawing.Color.Blue
  End Sub
  ' </snippet7>
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>
      CatalogZoneBase Example
    </title>
  </head>
  <body>
    <form id="form1" runat="server">
      <asp:webpartmanager id="WebPartManager1" runat="server" 
        OnDisplayModeChanged="WebPartManager1_DisplayModeChanged" />
      <uc1:DisplayModeMenuVB ID="DisplayModeMenu1" runat="server" />
      <asp:webpartzone id="zone1" runat="server">
        <zonetemplate>
          <asp:BulletedList 
            ID="BulletedList1" 
            Runat="server"
            DisplayMode="HyperLink" 
            Title="Favorite Links" >
            <asp:ListItem Value="http://msdn.microsoft.com">
              MSDN
            </asp:ListItem>
            <asp:ListItem Value="http://www.asp.net">
              ASP.NET
            </asp:ListItem>
            <asp:ListItem Value="http://www.msn.com">
              MSN
            </asp:ListItem>
          </asp:BulletedList>
        </ZoneTemplate>        
      </asp:webpartzone>
      <asp:CatalogZone ID="CatalogZone1" runat="server"
        EmptyZoneText="No controls are in the zone."
        HeaderText="My Web Parts Catalog"
        InstructionText="Add Web Parts controls to the zone."
        PartLinkStyle-Font-Italic="true"
        SelectedPartLinkStyle-Font-Bold="true"
        SelectTargetZoneText="Select zone"
        AddVerb-Text="Add Control"
        CloseVerb-Description="Close and return to browse mode." 
        SelectedCatalogPartID="Currently Selected CatalogPart ID.">
        <ZoneTemplate>
          <asp:DeclarativeCatalogPart ID="DeclarativeCatalogPart1" 
            runat="server">
            <WebPartsTemplate>
              <aspSample:TextDisplayWebPart 
                runat="server"   
                id="textwebpart" 
                title = "Text Content WebPart" 
                ExportMode="All"/>  
              <asp:Calendar id="calendar1" runat="server" 
                Title="My Calendar" />               
            </WebPartsTemplate>
          </asp:DeclarativeCatalogPart> 
          <asp:PageCatalogPart ID="PageCatalogPart1" runat="server" />
          <asp:ImportCatalogPart ID="ImportCatalogPart1" runat="server" /> 
        </ZoneTemplate>
      </asp:CatalogZone>
      <hr />
      <asp:CatalogZone ID="CatalogZone2" runat="server"
        BorderWidth="2"
        HeaderText="My Empty CatalogZone"
        EmptyZoneText="No controls are in the zone." />
      <hr />
      <asp:Panel ID="Panel1" runat="server" Visible="false">
        <asp:Button ID="Button1" runat="server" Width="200" 
          Text="Enable or Disable Verbs" 
          OnClick="Button1_Click" />
        <br />
        <asp:Button ID="Button2" runat="server" Width="200" 
          Text="List CatalogParts" OnClick="Button2_Click" />  
        <br />
        <asp:Button ID="Button3" runat="server" Width="200" 
          Text="Set Zone Text Properties" OnClick="Button3_Click" />  
        <br />   
        <asp:Button ID="Button4" runat="server" Width="200" 
          Text="Show Selected CatalogPart ID" OnClick="Button4_Click"  />  
        <br /> 
        <asp:Button ID="Button5" runat="server" Width="200" 
          Text="Change Part Link Styles" OnClick="Button5_Click"  />  
        <br />     
        <asp:Label ID="Label1" runat="server" Text="" /></asp:Panel>
    </form>
  </body>
</html>

The third part of the code example is the custom WebPart control named TextDisplayWebPart. It is declared within the zone, and an end user can add it from the catalog to the page. For the code example to run, you must compile this source code. You can compile it explicitly and put the resulting assembly in your Web site's Bin folder or the global assembly cache. Alternatively, you can put the source code in your site's App_Code folder, where it will be dynamically compiled at run time. For a demonstration of both methods of compiling, see Walkthrough: Developing and Using a Custom Web Server Control.

using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Security.Permissions;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;

namespace Samples.AspNet.CS.Controls
{
  [AspNetHostingPermission(SecurityAction.Demand,
    Level = AspNetHostingPermissionLevel.Minimal)]
  [AspNetHostingPermission(SecurityAction.InheritanceDemand,
    Level = AspNetHostingPermissionLevel.Minimal)]
  public class TextDisplayWebPart : WebPart
  {
    private String _contentText = null;
    TextBox input;
    Label DisplayContent;
    Literal lineBreak;

    [Personalizable(), WebBrowsable]
    public String ContentText
    {
      get { return _contentText; }
      set { _contentText = value; }
    }

    protected override void CreateChildControls()
    {
      Controls.Clear();
      DisplayContent = new Label();
      DisplayContent.BackColor = Color.LightBlue;
      DisplayContent.Text = this.ContentText;
      this.Controls.Add(DisplayContent);

      lineBreak = new Literal();
      lineBreak.Text = @"<br />";
      Controls.Add(lineBreak);

      input = new TextBox();
      this.Controls.Add(input);
      Button update = new Button();
      update.Text = "Set Label Content";
      update.Click += new EventHandler(this.submit_Click);
      this.Controls.Add(update);
    }

    private void submit_Click(object sender, EventArgs e)
    {
      // Update the label string.
      if (!string.IsNullOrEmpty(input.Text))
      {
        _contentText = input.Text + @"<br />";
        input.Text = String.Empty;
        DisplayContent.Text = this.ContentText;
      }
    }
  }
}

Imports System.Collections
Imports System.ComponentModel
Imports System.Drawing
Imports System.Security.Permissions
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.Web.UI.WebControls.WebParts

Namespace Samples.AspNet.VB.Controls

  <AspNetHostingPermission(SecurityAction.Demand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  <AspNetHostingPermission(SecurityAction.InheritanceDemand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  Public Class TextDisplayWebPart
    Inherits WebPart
    Private _contentText As String = Nothing
    Private _fontStyle As String = Nothing
    Private input As TextBox
    Private DisplayContent As Label
    Private lineBreak As Literal

    <Personalizable(), WebBrowsable()> _
    Public Property ContentText() As String
      Get
        Return _contentText
      End Get
      Set(ByVal value As String)
        _contentText = value
      End Set
    End Property

    Protected Overrides Sub CreateChildControls()
      Controls.Clear()
      DisplayContent = New Label()
      DisplayContent.BackColor = Color.LightBlue
      DisplayContent.Text = Me.ContentText
      Me.Controls.Add(DisplayContent)

      lineBreak = New Literal()
      lineBreak.Text = "<br />"
      Controls.Add(lineBreak)

      input = New TextBox()
      Me.Controls.Add(input)
      Dim update As New Button()
      update.Text = "Set Label Content"
      AddHandler update.Click, AddressOf Me.submit_Click
      Me.Controls.Add(update)

    End Sub

    Private Sub submit_Click(ByVal sender As Object, _
                             ByVal e As EventArgs)
      ' Update the label string.
      If input.Text <> String.Empty Then
        _contentText = input.Text + "<br />"
        input.Text = String.Empty
        DisplayContent.Text = Me.ContentText
      End If

    End Sub

  End Class

End Namespace

Note that for the code example to work, there is a setting you must add in the Web.config file to enable exporting Web Parts description files. Ensure that you have a Web.config file in the same directory as the Web page for this code example. Within the <system.web> section, make sure there is a <webParts> element with an enableExport attribute set to true, as in the following markup.

<webParts enableExport="true">

...

</webParts>

When you load the page in a browser, you can select Catalog from the drop-down list box to switch to catalog display mode. When the catalog is visible, you can see the two server controls that can be added from the catalog to the page, and you can also note in the UI the effects of the declarative and programmatic uses of the CatalogZoneBase class members.

Remarks

The CatalogZoneBase class is a base class that inherits from the ToolZone class. It provides a base set of behaviors for derived zones.

The CatalogZoneBase class provides a unique user interface (UI) that enables users to add WebPart controls and other server controls to Web pages. Controls that derive from the CatalogZoneBase class, such as CatalogZone, are the controls actually placed on Web pages. They act as containers for other controls, known as CatalogPart controls, that create lists of server controls for users to add to a page. Zones that derive from the CatalogZoneBase class can appear only when the page is in catalog display mode.

The mechanism for adding server controls to a catalog is the following set of three controls that derive from the base CatalogPart class.

The CatalogZoneBase class has a number of properties that are useful for displaying catalogs of WebPart controls. The AddVerb property references the verb that adds a selected control from the catalog to the page, while the CloseVerb property references a verb that closes the catalog and returns the page's display mode to browse mode. The CatalogParts property references the collection of all CatalogPart controls in the zone. Several text-oriented properties, such as EmptyZoneText, HeaderText, and InstructionText, override base properties to provide default text appropriate for catalogs. The SelectTargetZoneText property contains the text alongside the drop-down list control that allows users to choose which zone a control will be added to.

Several other properties are included in the CatalogZoneBase class. The SelectedCatalogPartID property is a unique string identifier for the currently selected CatalogPart control. The ShowCatalogIcons property indicates whether to show the icons that can be associated with controls by setting the CatalogIconImageUrl property on a WebPart control.

The PartLinkStyle property contains style attributes for the links to the CatalogPart controls that are not currently selected in the zone. In contrast, the SelectedPartLinkStyle property contains style attributes for a link to the CatalogPart control that the user has currently selected in the zone.

In addition to the properties, there are also some methods in the CatalogZoneBase class, in addition to the standard event-handling and rendering methods inherited from other base controls, which are uniquely designed for the purpose of handling catalogs of controls. The CreateCatalogPartChrome method creates the chrome (peripheral UI elements such as a border, verbs, icons, and a title) that surrounds each CatalogPart control in the zone, and also handles the rendering for the controls. The CreateCatalogParts method is an abstract method; derived classes override it to create instances of all the CatalogPart controls contained in the zone. The InvalidateCatalogParts method can be called by a derived class if the collection of CatalogPart controls in the zone changes for some programmatic reason, and the derived class needs to recreate the collection. The LoadPostData method loads the previously existing state for the check boxes next to the WebPart controls in the catalog, whenever the page is posted back to the server; conversely, the SaveControlState method saves the state of the check boxes. Finally, the RenderCatalogPartLinks method provides all the rendering for the links to each CatalogPart control contained in the zone.

Notes to Implementers

If you want to develop a custom zone for hosting CatalogPart controls, you must determine whether you want to provide zone template support. A zone template is created by types that implement the ITemplate interface, and is necessary if you want to enable page developers using your custom zone to reference CatalogPart controls within your zone in the declarative markup of a Web page. If you need zone template support, you should inherit from the CatalogZone class. In contrast, if your custom zone and its CatalogPart controls are going to be self-contained, and they will be created programmatically without any options for page developers to specify controls declaratively in a zone template, then you can inherit directly from the CatalogZoneBase class. If you inherit from the CatalogZoneBase class, you must override the CreateCatalogParts() method, and add the WebPart or other server controls you want in your catalog to a CatalogPartCollection object.

Constructors

Properties

Methods

Events

Explicit Interface Implementations

Extension Methods

Applies to

See also

• CatalogPart
• ASP.NET Web Parts Controls