CatalogZone Konstruktor

Definisi

Ruang nama:

System.Web.UI.WebControls.WebParts

Rakitan:

System.Web.dll

Menginisialisasi instans baru kelas CatalogZone.

public:
 CatalogZone();

public CatalogZone ();

Public Sub New ()

Contoh

Contoh kode berikut menunjukkan penggunaan terprogram konstruktor CatalogZone dalam kontrol kustom CatalogZone . Konstruktor digunakan untuk menginisialisasi beberapa nilai properti default untuk kontrol. Kode berikut menunjukkan kelas kustom CatalogZone dengan konstruktor yang dideklarasikan di dekat bagian atas. Untuk kode lengkap dan instruksi yang diperlukan untuk menyiapkan dan menjalankan contoh, lihat bagian Contoh di CatalogZone gambaran umum kelas.

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;
      }
    }
  }
}

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

  ' Create a custom CatalogZone control by setting some 
  ' properties in the constructor.
  <AspNetHostingPermission(SecurityAction.Demand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  <AspNetHostingPermission(SecurityAction.InheritanceDemand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  Public Class MyCatalogZone
    Inherits CatalogZone

    Public Sub New()
      Me.HeaderText = "My Company Catalog"
      Me.HeaderCloseVerb.Text = "Close Catalog"
      Me.CloseVerb.Text = "Close Catalog"
    End Sub

  End Class


  ' Create a custom WebPart to add to a WebPartZone.
  <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

Keterangan

CatalogZone Karena kontrol mengimplementasikan templat zona, biasanya digunakan secara deklaratif dan Anda jarang perlu membuat instans baru kelas menggunakan CatalogZone konstruktor. Namun, jika Anda mewarisi dari CatalogZone kelas untuk membuat zona kustom, Anda mungkin ingin menggunakan konstruktor untuk menginisialisasi beberapa nilai propertinya dan menyesuaikan tampilannya.

Lihat juga

• ASP.NET Kontrol Komponen Web