HyperLink.AddParsedSubObject(Object) Metodo
Definizione
Importante
Alcune informazioni sono relative alla release non definitiva del prodotto, che potrebbe subire modifiche significative prima della release definitiva. Microsoft non riconosce alcuna garanzia, espressa o implicita, in merito alle informazioni qui fornite.
Notifica al controllo che è stato analizzato un elemento e aggiunge l'elemento al controllo HyperLink.
protected:
override void AddParsedSubObject(System::Object ^ obj);
protected override void AddParsedSubObject (object obj);
override this.AddParsedSubObject : obj -> unit
Protected Overrides Sub AddParsedSubObject (obj As Object)
Parametri
Esempio
Nell'esempio di codice seguente viene illustrato come eseguire l'override del AddParsedSubObject metodo in un controllo server personalizzato HyperLink in modo che imposti sempre la proprietà text sulla proprietà text dell'oggetto analizzato, se l'oggetto analizzato è un Literaloggetto e su una stringa vuota in caso contrario.
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Controls" Assembly="Samples.AspNet.CS" %>
<%@ Page Language="C#" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Custom HyperLink - AddParsedSubObject - C# Example</title>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom HyperLink - AddParsedSubObject - C# Example</h3>
<aspSample:CustomHyperLinkAddParsedSubObject
id="HyperLink1" runat="server" Target="_blank"
NavigateUrl="http://www.microsoft.com/"
ToolTip="Microsoft Web Site">www.microsoft.com
</aspSample:CustomHyperLinkAddParsedSubObject>
</form>
</body>
</html>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB.Controls" Assembly="Samples.AspNet.VB" %>
<%@ Page Language="VB" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Custom HyperLink - AddParsedSubObject - VB.NET Example</title>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom HyperLink - AddParsedSubObject - VB.NET Example</h3>
<aspSample:CustomHyperLinkAddParsedSubObject
id="HyperLink1" runat="server" Target="_blank"
NavigateUrl="http://www.microsoft.com/"
ToolTip="Microsoft Web Site">www.microsoft.com
</aspSample:CustomHyperLinkAddParsedSubObject>
</form>
</body>
</html>
using System.Web;
using System.Security.Permissions;
namespace Samples.AspNet.CS.Controls
{
[AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
public sealed class CustomHyperLinkAddParsedSubObject : System.Web.UI.WebControls.HyperLink
{
protected override void AddParsedSubObject(object obj)
{
// If the server control contains any child controls.
if (this.HasControls())
{
// Notify the base server control that an element, either XML or HTML,
// was parsed, and adds the element to the server control's
// ControlCollection object.
base.AddParsedSubObject(obj);
}
// Else the server control doesn't contain any child controls.
else
{
// If the parsed element is a LiteralControl.
if (obj is System.Web.UI.LiteralControl)
{
// Set the server control's Text property to the parsed element's Text value.
this.Text = ((System.Web.UI.LiteralControl)obj).Text;
}
// Else the parsed element is not a LiteralControl.
else
{
// If the server control has a value in the Text property.
string currentText = this.Text;
if (currentText.Length != 0)
{
// Set the server control's Text property to an empty string.
this.Text = System.String.Empty;
// Notify the base server control that a new LiteralControl was parsed,
// and adds the element to the server control's ControlCollection object.
base.AddParsedSubObject(new System.Web.UI.LiteralControl(currentText));
}
base.AddParsedSubObject(obj);
}
}
}
}
}
<AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class CustomHyperLinkAddParsedSubObject
Inherits System.Web.UI.WebControls.HyperLink
Protected Overrides Sub AddParsedSubObject(ByVal obj As Object)
' If the server control contains any child controls.
If Me.HasControls() Then
' Notify the base server control that an element, either XML or HTML,
' was parsed, and adds the element to the server control's
' ControlCollection object.
MyBase.AddParsedSubObject(obj)
' Else the server control doesn't contain any child controls.
Else
' If the parsed element is a LiteralControl.
If TypeOf obj Is System.Web.UI.LiteralControl Then
' Set the server control's Text property to the parsed element's Text value.
Me.Text = CType(obj, System.Web.UI.LiteralControl).Text
' Else the parsed element is not a LiteralControl.
Else
' If the server control has a value in the Text property.
Dim currentText As String = Me.Text
If currentText.Length <> 0 Then
' Set the server control's Text property to an empty string.
Me.Text = System.String.Empty
' Notify the base server control that a new LiteralControl was parsed,
' and adds the element to the server control's ControlCollection object.
MyBase.AddParsedSubObject(New System.Web.UI.LiteralControl(currentText))
End If
MyBase.AddParsedSubObject(obj)
End If
End If
End Sub
End Class
Commenti
Questo metodo viene usato principalmente dagli sviluppatori di controlli, durante la HyperLink derivazione di un controllo personalizzato dalla classe .
Se l'oggetto di input è un LiteralControloggetto e il HyperLink controllo non dispone di controlli figlio, l'oggetto di input viene utilizzato per impostare la Text proprietà del controllo. In caso contrario, viene chiamato il AddParsedSubObject metodo della classe di base Control e l'oggetto specificato viene aggiunto all'insieme Controls .