Literal.AddParsedSubObject(Object) Metoda
Definice
Důležité
Některé informace platí pro předběžně vydaný produkt, který se může zásadně změnit, než ho výrobce nebo autor vydá. Microsoft neposkytuje žádné záruky, výslovné ani předpokládané, týkající se zde uváděných informací.
Upozorní Literal ovládací prvek, že byl analyzován element XML nebo HTML a přidá tento prvek do ControlCollection ovládacího prvku.
protected:
override void AddParsedSubObject(System::Object ^ obj);protected override void AddParsedSubObject (object obj);override this.AddParsedSubObject : obj -> unitProtected Overrides Sub AddParsedSubObject (obj As Object)Parametry
Výjimky
obj není typu LiteralControl.
Příklady
Následující příklad kódu ukazuje, jak přepsat metodu AddParsedSubObject ve vlastním server ovládacím prvku tak, aby vždy nastaví Text vlastnost na parsovaný objekt Text vlastnost, pokud parsovaný objekt je , Literala na prázdný string jinak.
<%@ 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 LiteralControl - AddParsedSubObject - C# Example</title>
<script runat="server">
void Button1_Click(Object sender, EventArgs e)
{
Literal1.Text = "Welcome to ASP.NET!";
}
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom LiteralControl - AddParsedSubObject - C# Example</h3>
<aspSample:CustomLiteralAddParsedSubObject
id="Literal1"
runat="server"
text="Literal Text" />
<br /><br />
<asp:Button
id="Button1"
Text="Change"
OnClick="Button1_Click"
runat="server"/>
</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 LiteralControl - AddParsedSubObject - VB.Net Example</title>
<script runat="server">
Sub Button1_Click(sender As Object, e As EventArgs)
Literal1.Text = "Welcome to ASP.NET!"
End Sub
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom LiteralControl - AddParsedSubObject - VB.Net Example</h3>
<aspSample:CustomLiteralAddParsedSubObject id="Literal1"
runat="server" text="Literal Text" />
<br /><br />
<asp:Button id="Button1"
Text="Change"
OnClick="Button1_Click"
runat="server"/>
</form>
</body>
</html>
using System.Web;
using System.Security.Permissions;
namespace Samples.AspNet.CS.Controls
{
[AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
public sealed class CustomLiteralAddParsedSubObject : System.Web.UI.LiteralControl
{
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 CustomLiteralAddParsedSubObject
Inherits System.Web.UI.WebControls.Literal
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