HtmlButton.RenderAttributes(HtmlTextWriter) 方法
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
将 HtmlButton 控件的属性呈现到指定的 HtmlTextWriter 对象。
protected:
override void RenderAttributes(System::Web::UI::HtmlTextWriter ^ writer);protected override void RenderAttributes (System.Web.UI.HtmlTextWriter writer);override this.RenderAttributes : System.Web.UI.HtmlTextWriter -> unitProtected Overrides Sub RenderAttributes (writer As HtmlTextWriter)参数
- writer
- HtmlTextWriter
包含要在客户端上呈现的输出流的 HtmlTextWriter。
示例
下面的代码示例演示如何重写 RenderAttributes 自定义服务器控件中的方法，以便始终为 HtmlButton 控件显示标题。
<%@ 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 HtmlButton - RenderAttributes - C# Example</title>
<script runat="server">
void Page_Load(Object sender, EventArgs e)
{
HtmlButton1.Attributes.Add("onclick","alert('Hello client-side world.');");
}
void HtmlButton1_ServerClick(Object sender, EventArgs e)
{
Div1.InnerHtml = "Hello server-side world.";
}
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom HtmlButton - RenderAttributes - C# Example</h3>
<aspSample:CustomHtmlButtonRenderAttributes
id="HtmlButton1"
runat="server"
type="button"
onserverclick="HtmlButton1_ServerClick"
name="HtmlButton1">Html Button</aspSample:CustomHtmlButtonRenderAttributes>
<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 HtmlButton - RenderAttributes - Visual Basic Example</title>
<script runat="server">
Sub Page_Load(sender As Object, e As EventArgs)
HtmlButton1.Attributes.Add("onclick", "alert('Hello client-side world.');")
End Sub
Sub HtmlButton1_ServerClick(sender As Object, e As EventArgs)
Div1.InnerHtml = "Hello server-side world."
End Sub
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom HtmlButton - RenderAttributes - Visual Basic Example</h3>
<aspSample:CustomHtmlButtonRenderAttributes
id="HtmlButton1"
runat="server"
type="button"
onserverclick="HtmlButton1_ServerClick"
name="HtmlButton1">Html Button</aspSample:CustomHtmlButtonRenderAttributes>
<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 CustomHtmlButtonRenderAttributes : System.Web.UI.HtmlControls.HtmlButton
{
protected override void RenderAttributes(System.Web.UI.HtmlTextWriter writer)
{
// Call the base class's RenderAttributes method.
base.RenderAttributes(writer);
// Write out the HtmlButton control's Title tag.
writer.Write(" Title=\"Text from RenderAttributes.\"");
}
}
}
Imports System.Web
Imports System.Security.Permissions
Namespace Samples.AspNet.VB.Controls
<AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class CustomHtmlButtonRenderAttributes
Inherits System.Web.UI.HtmlControls.HtmlButton
Protected Overrides Sub RenderAttributes(ByVal writer As System.Web.UI.HtmlTextWriter)
' Call the base class's RenderAttributes method.
MyBase.RenderAttributes(writer)
' Write out the HtmlButton control's Title tag.
writer.Write(" Title=""Text from RenderAttributes.""")
End Sub
End Class
End Namespace
注解
该方法 RenderAttributes 写入 onclick 呈现 HtmlButton 控件的属性，然后调用基 HtmlControl.RenderAttributes 方法。
该方法 RenderAttributes 主要用于控件开发人员扩展控件的功能 HtmlButton 。