ASP.NET Tutorial/Custom Controls/Extends CompositeControl

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Creating a composite control (C#)

using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Text;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebControlLibrary1
{
    [DefaultProperty("Text")]
    [ToolboxData("<{0}:WebCustomControl2 runat=server></{0}:WebCustomControl2>")]
    public class WebCustomControl2 : CompositeControl
    {
        protected TextBox textbox = new TextBox();
        protected override void CreateChildControls()
        {
            this.Controls.Add(textbox);
        }
    }
}


Creating a composite control (VB)

Imports System.ruponentModel
Imports System.Web.UI
Imports System.Web.UI.WebControls
<DefaultProperty("Text")> _
<ToolboxData("<{0}:[WebCustomControl2] runat=server></{0}:[WebCustomControl2]>")> _
Public Class [WebCustomControl2]
    Inherits System.Web.UI.WebControls.rupositeControl
    Protected textbox As TextBox
    Protected Overrides Sub CreateChildControls()
        Me.Controls.Add(textbox)
    End Sub
End Class


Exposing control properties in a composite control (C#)

using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Text;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebControlLibrary1
{
    [DefaultProperty("Text")]
    [ToolboxData("<{0}:WebCustomControl2 runat=server></{0}:WebCustomControl2>")]
    public class WebCustomControl2 : CompositeControl
    {
        protected TextBox textbox = new TextBox();
        public string Text
        {
            get
            {
                EnsureChildControls();
                return textbox.Text;
            }
            set
            {
                EnsureChildControls();
                textbox.Text = value;
            }
        }

        protected override void CreateChildControls()
        {
            this.Controls.Add(textbox);
        }
    }
}


Exposing control properties in a composite control (VB)

Imports System.ruponentModel
Imports System.Web.UI
Imports System.Web.UI.WebControls
<DefaultProperty("Text")> _
<ToolboxData("<{0}:[WebCustomControl2] runat=server></{0}:[WebCustomControl2]>")> _
Public Class [WebCustomControl2]
    Inherits System.Web.UI.WebControls.rupositeControl
    Protected textbox As TextBox
    Public Property Text() As String
        Get
            EnsureChildControls()
            Return textbox.Text
        End Get
        Set(ByVal value As String)
            EnsureChildControls()
            textbox.Text = value
        End Set
    End Property

    Protected Overrides Sub CreateChildControls()
        Me.Controls.Add(textbox)
    End Sub
End Class


TitledText Box

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="TitledTextBoxTest" %>
<%@ Register TagPrefix="apress" Namespace="CustomServerControlsLibrary"
  Assembly="CustomServerControls" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <apress:TitledTextBox Title="Sample Title" ID="TitledTextBox1" runat="server" BackColor="#FFFF80" Font-Size="X-Large" Height="85px" Text="Sample Text" Width="569px" />
    </div>
    </form>
</body>
</html>
File: CustomServerControls.cs
using System;
using System.Collections;
using System.ruponentModel;
using System.Data;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
namespace CustomServerControlsLibrary
{
  [Designer(typeof(TitledTextBoxDesigner))]
  public class TitledTextBox : CompositeControl
  {
    public TitledTextBox() : base()
    {
      Title = "";
      Text = "";
    }
    protected Label label;
    protected TextBox textBox;
    
    public string Title
    {
      get {return (string)ViewState["Title"];}
      set {ViewState["Title"] = value;}
    }
    public string Text
    {
      get {return (string)ViewState["Text"];}
      set {ViewState["Text"] = value;}
    }
    protected override void CreateChildControls()
    {
      label = new Label();
      label.EnableViewState = false;
      label.Text = Title;
      Controls.Add(label);
      Controls.Add(new LiteralControl("&nbsp;&nbsp;"));
      textBox = new TextBox();
      textBox.EnableViewState = false;
      textBox.Text = Text;
      textBox.TextChanged += new EventHandler(OnTextChanged);
      Controls.Add(textBox);
    }
    public event EventHandler TextChanged;
    
    protected virtual void OnTextChanged(object sender, EventArgs e)
    {
      if (TextChanged != null)
        TextChanged(this, e);
    }
  }
}
public partial class TitledTextBoxTest : System.Web.UI.Page
{
  protected void Page_Load(object sender, EventArgs e)
  {
  }
}
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/Custom_Controls/Extends_CompositeControl&oldid=3327»