ListBox.AddAttributesToRender(HtmlTextWriter) Method
Definition
Important
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Adds name
, size
, multiple
, and onchange
to the list of attributes to render.
protected:
override void AddAttributesToRender(System::Web::UI::HtmlTextWriter ^ writer);
protected override void AddAttributesToRender (System.Web.UI.HtmlTextWriter writer);
override this.AddAttributesToRender : System.Web.UI.HtmlTextWriter -> unit
Protected Overrides Sub AddAttributesToRender (writer As HtmlTextWriter)
Parameters
- writer
- HtmlTextWriter
The output stream that renders HTML content to the client.
Examples
The following code example demonstrates how to override the AddAttributesToRender method in a custom server control, so that the ListBox list item text always displays as bold.
<%@ 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 ListBox - AddAttributesToRender - C# Example</title>
<script runat="server">
private void Page_Load(object sender, System.EventArgs e)
{
ListBox1.Items.Add(new ListItem("Item1", "Item1"));
ListBox1.Items.Add(new ListItem("Item2", "Item2"));
ListBox1.Items.Add(new ListItem("Item2", "Item2"));
}
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom ListBox - AddAttributesToRender - C# Example</h3>
<aspSample:CustomListBoxAddAttributesToRender
id="ListBox1"
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 ListBox - AddAttributesToRender - VB.NET Example</title>
<script runat="server">
Sub Page_Load(sender As Object, e As EventArgs)
ListBox1.Items.Add(New ListItem("Item1", "Item1"))
ListBox1.Items.Add(New ListItem("Item2", "Item2"))
ListBox1.Items.Add(New ListItem("Item2", "Item2"))
End Sub
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom ListBox - AddAttributesToRender - VB.NET Example</h3>
<aspSample:CustomListBoxAddAttributesToRender id="ListBox1" 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 CustomListBoxAddAttributesToRender : System.Web.UI.WebControls.ListBox
{
protected override void AddAttributesToRender(System.Web.UI.HtmlTextWriter writer)
{
// Show the ListItem text as Bold
writer.AddStyleAttribute(System.Web.UI.HtmlTextWriterStyle.FontWeight, "bold");
// Call the Base's AddAttributesToRender method.
base.AddAttributesToRender(writer);
}
}
}
<AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class CustomListBoxAddAttributesToRender
Inherits System.Web.UI.WebControls.ListBox
Protected Overrides Sub AddAttributesToRender(ByVal writer As System.Web.UI.HtmlTextWriter)
' Show the ListItem text as Bold
writer.AddStyleAttribute(System.Web.UI.HtmlTextWriterStyle.FontWeight, "bold")
' Call the Base's AddAttributesToRender method.
MyBase.AddAttributesToRender(writer)
End Sub
End Class
Applies to
See also
Dolgozzon együtt velünk a GitHubon
A tartalom forrása a GitHubon található, ahol létrehozhat és áttekinthet problémákat és lekéréses kérelmeket is. További információért tekintse meg a közreműködői útmutatónkat.