ListBox.AddAttributesToRender(HtmlTextWriter) 方法
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
將 name、size、multiple 和 onchange 加入要呈現的屬性清單。
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 -> unitProtected Overrides Sub AddAttributesToRender (writer As HtmlTextWriter)參數
- writer
- HtmlTextWriter
將 HTML 內容呈現給用戶端的輸出資料流。
範例
下列程式碼範例示範如何在自訂伺服器控制項中覆寫 AddAttributesToRender 方法，讓 ListBox 清單專案文字一律顯示為粗體。
<%@ 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
