CatalogPartCollection Class
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Contains a collection of CatalogPart controls used to provide catalogs of Web server controls that end users can add to a Web page. This class cannot be inherited.
public ref class CatalogPartCollection sealed : System::Collections::ReadOnlyCollectionBasepublic sealed class CatalogPartCollection : System.Collections.ReadOnlyCollectionBasetype CatalogPartCollection = class
inherit ReadOnlyCollectionBasePublic NotInheritable Class CatalogPartCollection
Inherits ReadOnlyCollectionBase- Inheritance
Examples
The following code example demonstrates several uses of the CatalogPartCollection class. There are four parts to this code example:
A user control that enables you to change display modes on a Web Parts page.
A class for a custom WebPart control named
TextDisplayWebPart, which is referenced in the Web page and is contained in one of the CatalogPart controls.A Web page that references the
TextDisplayWebPartcontrol, contains a CatalogZone control with two of the CatalogPart controls from the Web Parts control set declared in the zone, and contains event-driven code to create and manipulate a CatalogPartCollection object.An explanation of how the code example works when you load it in a browser.
The first part of the code example is the user control. The source code for the user control comes from another topic. For this code example to work, you need to obtain the .ascx file for the user control from the Walkthrough: Changing Display Modes on a Web Parts Page topic, and place the file in the same folder as the .aspx page in this code example.
The second part of the code example is the TextDisplayWebPart control. 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 walkthrough that demonstrates both methods of compiling, see Walkthrough: Developing and Using a Custom Web Server Control. Note that the control has a property named ContentText; this property holds the value that the user enters in the text box.
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
The third part of the code example is the Web page. Notice that the <asp:catalogzone> element for the page contains declarations for two CatalogPart controls. These controls become part of a custom CatalogPartCollection object that is created when the Button1_Click method executes. The PageCatalogPart control contains Web server controls that have been previously closed by a user at run time. Controls in the PageCatalogPart control can be added back to a page. The DeclarativeCatalogPart control contains a declaration of the custom TextDisplayWebPart control. When the page is in catalog mode, a user can add the TextDisplayWebPart control to the page so that it can be used in normal browse mode.
<%@ 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">
// <snippet2>
protected void Button1_Click(object sender, EventArgs e)
{
ArrayList list = new ArrayList(2);
list.Add(PageCatalogPart1);
list.Add(DeclarativeCatalogPart1);
// Pass an ICollection object to the constructor.
CatalogPartCollection myParts = new CatalogPartCollection(list);
foreach (CatalogPart catalog in myParts)
{
catalog.Description = "My " + catalog.DisplayTitle;
}
// Use the IndexOf property to locate a CatalogPart control.
int PageCatalogPartIndex = myParts.IndexOf(PageCatalogPart1);
myParts[PageCatalogPartIndex].ChromeType = PartChromeType.TitleOnly;
// Use the Contains method to see if a CatalogPart control exists.
if (myParts.Contains(PageCatalogPart1))
{
WebPart closedWebPart = null;
WebPartDescriptionCollection descriptions = PageCatalogPart1.GetAvailableWebPartDescriptions();
if (descriptions.Count > 0)
{
closedWebPart = PageCatalogPart1.GetWebPart(descriptions[0]);
closedWebPart.AllowClose = false;
}
}
// Use indexers to display the details of the CatalogPart controls.
Label1.Text = String.Empty;
Label1.Text =
"<h3>PageCatalogPart Details</h3>" +
"ID: " + myParts[0].ID + "<br />" +
"Count: " + myParts[0].GetAvailableWebPartDescriptions().Count;
Label1.Text +=
"<h3>DeclarativeCatalogPart Details</h3>" +
"ID: " + myParts["DeclarativeCatalogPart1"].ID + "<br />" +
"Count: " + myParts["DeclarativeCatalogPart1"].GetAvailableWebPartDescriptions().Count;
}
// </snippet2>
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>PageCatalogPart Details</title>
</head>
<body>
<form id="form1" runat="server">
<asp:WebPartManager ID="WebPartManager1" runat="server" />
<uc1:DisplayModeMenuCS ID="DisplayModeMenu1" runat="server" />
<asp:WebPartZone ID="WebPartZone1" 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">
<ZoneTemplate>
<asp:DeclarativeCatalogPart ID="DeclarativeCatalogPart1" runat="server">
<WebPartsTemplate>
<aspSample:TextDisplayWebPart runat="server"
id="TextDisplayWebPart1"
Title="Text Display WebPart" />
</WebPartsTemplate>
</asp:DeclarativeCatalogPart>
<asp:PageCatalogPart ID="PageCatalogPart1" runat="server" />
</ZoneTemplate>
</asp:CatalogZone>
<hr />
<asp:Button ID="Button1"
runat="server"
Text="Display CatalogPart Properties"
OnClick="Button1_Click"/>
<br />
<asp:Label ID="Label1" runat="server" Text="" />
</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">
' <snippet2>
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs)
Dim list As New ArrayList(2)
list.Add(PageCatalogPart1)
list.Add(DeclarativeCatalogPart1)
' Pass an ICollection object to the constructor.
Dim myParts As New CatalogPartCollection(list)
Dim catalog As CatalogPart
For Each catalog In myParts
catalog.Description = "My " + catalog.DisplayTitle
Next catalog
' Use the IndexOf property to locate a CatalogPart control.
Dim PageCatalogPartIndex As Integer = _
myParts.IndexOf(PageCatalogPart1)
myParts(PageCatalogPartIndex).ChromeType = PartChromeType.TitleOnly
' Use the Contains method to see if a CatalogPart control exists.
If myParts.Contains(PageCatalogPart1) Then
Dim closedWebPart As WebPart = Nothing
Dim descriptions As WebPartDescriptionCollection = _
PageCatalogPart1.GetAvailableWebPartDescriptions()
If descriptions.Count > 0 Then
closedWebPart = PageCatalogPart1.GetWebPart(descriptions(0))
closedWebPart.AllowClose = False
End If
End If
' Use indexers to display the details of the CatalogPart controls.
Label1.Text = String.Empty
Label1.Text = _
"<h3>PageCatalogPart Details</h3>" & _
"ID: " & myParts(0).ID + "<br />" & _
"Count: " & myParts(0).GetAvailableWebPartDescriptions().Count
Label1.Text += _
"<h3>DeclarativeCatalogPart Details</h3>" & _
"ID: " & myParts("DeclarativeCatalogPart1").ID & "<br />" & _
"Count: " & myParts("DeclarativeCatalogPart1") _
.GetAvailableWebPartDescriptions().Count
End Sub
' </snippet2>
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>PageCatalogPart Details</title>
</head>
<body>
<form id="form1" runat="server">
<asp:WebPartManager ID="WebPartManager1" runat="server" />
<uc1:DisplayModeMenuVB ID="DisplayModeMenu1" runat="server" />
<asp:WebPartZone ID="WebPartZone1" 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">
<ZoneTemplate>
<asp:DeclarativeCatalogPart ID="DeclarativeCatalogPart1" runat="server">
<WebPartsTemplate>
<aspSample:TextDisplayWebPart runat="server"
id="TextDisplayWebPart1"
Title="Text Display WebPart" />
</WebPartsTemplate>
</asp:DeclarativeCatalogPart>
<asp:PageCatalogPart ID="PageCatalogPart1" runat="server" />
</ZoneTemplate>
</asp:CatalogZone>
<hr />
<asp:Button ID="Button1"
runat="server"
Text="Display CatalogPart Properties"
OnClick="Button1_Click"/>
<br />
<asp:Label ID="Label1" runat="server" Text="" />
</form>
</body>
</html>
When you load the page in a browser, you can switch the page into catalog mode by selecting Catalog in the Display Mode drop-down list control. You can add the custom WebPart control to the page by selecting the check box next to it and clicking Add. Click Close to return the page to browse mode. On the control you just added, if you click the verbs menu (the down arrow that appears in the title bar) and then click Close, the control is removed from the page and added to the PageCatalogPart control. Return the page to catalog mode, and click the Page Catalog link to view the contents of the PageCatalogPart control. Notice that the control you closed now appears there. Clicking the Display CatalogPart Properties button accesses the CatalogPartCollection object and displays certain properties of the contained CatalogPart controls.
Remarks
The CatalogPartCollection class is a read-only collection of CatalogPart controls, typically used by a CatalogZoneBase zone to track the set of CatalogPart controls contained by the zone.
When a Web Parts page enters catalog mode, the zone creates a new CatalogPartCollection object consisting of the CatalogPart controls. Each CatalogPart control in the collection can contain references to zero or more Web server controls, which are displayed in the form of a catalog of available server controls.
You can create a CatalogPartCollection collection of controls for your own programmatic use if, for example, you need to perform some mass operation on a set of CatalogPart controls. Even though the CatalogPartCollection object is read-only, you can make programmatic changes to the underlying controls referenced in the collection.
Constructors
| CatalogPartCollection() |
Initializes a new, empty instance of the CatalogPartCollection class. |
| CatalogPartCollection(CatalogPartCollection, ICollection) |
Initializes a new instance of the CatalogPartCollection class by passing in an ICollection collection of the existing CatalogPart controls in a zone, and an additional collection of controls. |
| CatalogPartCollection(ICollection) |
Initializes a new instance of the CatalogPartCollection class by passing in an ICollection collection of CatalogPart controls. |
Fields
| Empty |
References a static, read-only, empty instance of the collection. |
Properties
| Count |
Gets the number of elements contained in the ReadOnlyCollectionBase instance. (Inherited from ReadOnlyCollectionBase) |
| InnerList |
Gets the list of elements contained in the ReadOnlyCollectionBase instance. (Inherited from ReadOnlyCollectionBase) |
| Item[Int32] |
Gets or sets a member of the collection, based on its position in the collection. |
| Item[String] |
Returns a member of the collection based on a unique string identifier. |
Methods
| Contains(CatalogPart) |
Returns a value indicating whether a particular control exists in the collection. |
| CopyTo(CatalogPart[], Int32) |
Copies the collection to an array of CatalogPart objects. |
| Equals(Object) |
Determines whether the specified object is equal to the current object. (Inherited from Object) |
| GetEnumerator() |
Returns an enumerator that iterates through the ReadOnlyCollectionBase instance. (Inherited from ReadOnlyCollectionBase) |
| GetHashCode() |
Serves as the default hash function. (Inherited from Object) |
| GetType() |
Gets the Type of the current instance. (Inherited from Object) |
| IndexOf(CatalogPart) |
Returns the position of a particular member of the collection. |
| MemberwiseClone() |
Creates a shallow copy of the current Object. (Inherited from Object) |
| ToString() |
Returns a string that represents the current object. (Inherited from Object) |
Explicit Interface Implementations
| ICollection.CopyTo(Array, Int32) |
Copies the entire ReadOnlyCollectionBase to a compatible one-dimensional Array, starting at the specified index of the target array. (Inherited from ReadOnlyCollectionBase) |
| ICollection.IsSynchronized |
Gets a value indicating whether access to a ReadOnlyCollectionBase object is synchronized (thread safe). (Inherited from ReadOnlyCollectionBase) |
| ICollection.SyncRoot |
Gets an object that can be used to synchronize access to a ReadOnlyCollectionBase object. (Inherited from ReadOnlyCollectionBase) |
Extension Methods
| Cast<TResult>(IEnumerable) |
Casts the elements of an IEnumerable to the specified type. |
| OfType<TResult>(IEnumerable) |
Filters the elements of an IEnumerable based on a specified type. |
| AsParallel(IEnumerable) |
Enables parallelization of a query. |
| AsQueryable(IEnumerable) |
Converts an IEnumerable to an IQueryable. |
