ASP.NET Tutorial/Custom Controls/Extends CompositeControl
Содержание
Creating a composite control (C#)
<source lang="csharp">
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);
}
}
}</source>
Creating a composite control (VB)
<source lang="csharp">
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</source>
Exposing control properties in a composite control (C#)
<source lang="csharp">
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);
}
}
}</source>
Exposing control properties in a composite control (VB)
<source lang="csharp">
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</source>
TitledText Box
<source lang="csharp">
<%@ 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">
<apress:TitledTextBox Title="Sample Title" ID="TitledTextBox1" runat="server" BackColor="#FFFF80" Font-Size="X-Large" Height="85px" Text="Sample Text" Width="569px" />
</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(" "));
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)
{
}
}</source>
