HtmlSelect.AddParsedSubObject(Object) Metode
Definisi
Penting
Beberapa informasi terkait produk prarilis yang dapat diubah secara signifikan sebelum dirilis. Microsoft tidak memberikan jaminan, tersirat maupun tersurat, sehubungan dengan informasi yang diberikan di sini.
Menambahkan kontrol anak yang diurai ke HtmlSelect kontrol.
protected:
override void AddParsedSubObject(System::Object ^ obj);protected override void AddParsedSubObject(object obj);override this.AddParsedSubObject : obj -> unitProtected Overrides Sub AddParsedSubObject (obj As Object)Parameter
- obj
- Object
Kontrol anak yang diurai untuk ditambahkan.
Penerapan
Pengecualian
Kontrol anak yang ditentukan oleh obj parameter harus berjenis ListItem.
Contoh
Contoh kode berikut menunjukkan cara mengambil alih AddParsedSubObject metode dalam kontrol server kustom sehingga selalu memeriksa apakah instans ListItem kelas ditambahkan ke HtmlSelect koleksi item yang dipilih.
<%@ 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 HtmlSelect - AddParsedSubObject - C# Example</title>
<script runat="server">
void HtmlInputButton1_ServerClick(Object sender, EventArgs e)
{
if (HtmlSelect1.SelectedIndex >= 0)
{
if (HtmlSelect1.Multiple)
{
Div1.InnerHtml = "You selected:";
for (int i=0; i<=HtmlSelect1.Items.Count - 1; i++)
{
if (HtmlSelect1.Items[i].Selected)
{
Div1.InnerHtml += "<br /> " + HtmlSelect1.Items[i].Value;
}
}
}
else
{
Div1.InnerHtml = "You selected " + HtmlSelect1.Value;
}
}
else
{
Div1.InnerHtml = "You did not select an item.";
}
}
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom HtmlSelect - AddParsedSubObject - C# Example</h3>
<p>
<aspSample:CustomHtmlSelectAddParsedSubObject
id="HtmlSelect1"
name="HtmlSelect1"
runat="server">
<option value="Option1">Option1</option>
<option value="Option2">Option2</option>
<option value="Option3">Option3</option>
</aspSample:CustomHtmlSelectAddParsedSubObject>
</p>
<p>
<input
id="HtmlInputButton1"
runat="server"
type="button"
onserverclick="HtmlInputButton1_ServerClick"
value="Select"
name="HtmlInputButton1" />
</p>
<br />
<div id="Div1" runat="server"
style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px" />
</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 HtmlSelect - AddParsedSubObject - VB.NET Example</title>
<script runat="server">
Sub HtmlInputButton1_ServerClick(sender As Object, e As EventArgs)
If HtmlSelect1.SelectedIndex >= 0 Then
If HtmlSelect1.Multiple = True Then
Div1.InnerHtml = "You selected:"
Dim i As Integer
For i = 0 To HtmlSelect1.Items.Count - 1
If HtmlSelect1.Items(i).Selected = True Then
Div1.InnerHtml += "<br /> " & HtmlSelect1.Items(i).Value
End If
Next i
Else
Div1.InnerHtml = "You selected " & HtmlSelect1.Value
End If
Else
Div1.InnerHtml = "You did not select an item."
End If
End Sub
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom HtmlSelect - AddParsedSubObject - VB.NET Example</h3>
<p>
<aspSample:CustomHtmlSelectAddParsedSubObject
id="HtmlSelect1"
name="HtmlSelect1"
runat="server">
<option value="Option1">Option1</option>
<option value="Option2">Option2</option>
<option value="Option3">Option3</option>
</aspSample:CustomHtmlSelectAddParsedSubObject>
</p>
<p>
<input
id="HtmlInputButton1"
runat="server"
type="button"
onserverclick="HtmlInputButton1_ServerClick"
value="Select"
name="HtmlInputButton1" />
</p>
<br />
<div id="Div1" runat="server"
style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px" />
</form>
</body>
</html>
using System.Web;
using System.Security.Permissions;
namespace Samples.AspNet.CS.Controls
{
[AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
public sealed class CustomHtmlSelectAddParsedSubObject : System.Web.UI.HtmlControls.HtmlSelect
{
protected override void AddParsedSubObject(object obj)
{
// If the object is a ListItem, then add the ListItem to the Items collection.
if (obj is System.Web.UI.WebControls.ListItem)
{
Items.Add((System.Web.UI.WebControls.ListItem)obj);
}
else
{
throw new System.Web.HttpException("You cannot have a child control of type " + obj.GetType().Name.ToString());
}
}
}
}
<AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class CustomHtmlSelectAddParsedSubObject
Inherits System.Web.UI.HtmlControls.HtmlSelect
Protected Overrides Sub AddParsedSubObject(ByVal obj As Object)
' If the object is a ListItem, then add the ListItem to the Items collection.
If TypeOf obj Is System.Web.UI.WebControls.ListItem Then
Items.Add(CType(obj, System.Web.UI.WebControls.ListItem))
Else
Throw New System.Web.HttpException("You cannot have a child control of type " + obj.GetType().Name.ToString())
End If
End Sub
End Class
Keterangan
Metode
