CatalogZone Constructor

Definition

Namespace:

System.Web.UI.WebControls.WebParts

Assembly:

System.Web.dll

Initializes a new instance of the CatalogZone class.

C#

public CatalogZone();

Examples

The following code example demonstrates the programmatic use of the CatalogZone constructor in a custom CatalogZone control. The constructor is used to initialize some default property values for the control. The following code shows the custom CatalogZone class with the constructor declared near the top. For the full code and instructions required to set up and run the example, see the Example section in the CatalogZone class overview.

C#

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
{
  // Create a customized CatalogZone control by setting 
  // some properties in the constructor.
  [AspNetHostingPermission(SecurityAction.Demand,
    Level = AspNetHostingPermissionLevel.Minimal)]
  [AspNetHostingPermission(SecurityAction.InheritanceDemand,
    Level = AspNetHostingPermissionLevel.Minimal)]
  public class MyCatalogZone : CatalogZone
  {
    public MyCatalogZone()
    {
      this.HeaderText = "My Company Catalog";
      this.HeaderCloseVerb.Text = "Close Catalog";
      this.CloseVerb.Text = "Close Catalog";
    }
  }

  // Create a custom WebPart control to add to a WebPartZone.
  [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;
      }
    }
  }
}

Remarks

Because the CatalogZone control implements a zone template, it is usually used declaratively and you will seldom need to create a new instance of the class using the CatalogZone constructor. However, if you inherit from the CatalogZone class to create a custom zone, you might wish to use the constructor to initialize some of its property values and customize its appearance.

Applies to

See also

• ASP.NET Web Parts Controls