ImageButton.TagKey 属性
定义
重要
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HtmlTextWriterTag获取与ImageButton控件对应的值。
protected:
virtual property System::Web::UI::HtmlTextWriterTag TagKey { System::Web::UI::HtmlTextWriterTag get(); };[System.ComponentModel.Browsable(false)]
protected override System.Web.UI.HtmlTextWriterTag TagKey { get; }[<System.ComponentModel.Browsable(false)>]
member this.TagKey : System.Web.UI.HtmlTextWriterTagProtected Overrides ReadOnly Property TagKey As HtmlTextWriterTag属性值
- 属性
示例
下面的代码示例演示如何重写 TagKey 自定义 ImageButton 控件中的方法，以便始终返回 Input 标记。
注释
下面的代码示例使用单文件代码模型，如果直接复制到代码隐藏文件中，可能无法正常工作。 必须将代码示例的第一部分复制到扩展名为 .aspx 的空文本文件中。 第二部分必须位于.cs文件（适用于 C#）或.vb文件（对于 Visual Basic）。 有关 Web 窗体代码模型的详细信息，请参阅 ASP.NET Web 窗体页代码模型。
<%@ 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 ImageButton - TagKey - C# Example</title>
<script runat="server">
void ImageButton1_Command(Object sender, CommandEventArgs e)
{
// Redirect to the Microsoft home page.
Response.Redirect("http://www.microsoft.com/");
}
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom ImageButton - TagKey - C# Example</h3>
<aspSample:CustomImageButtonTagKey
id="ImageButton1"
runat="server"
OnCommand="ImageButton1_Command"
AlternateText="Microsoft Home"
ImageUrl="http://www.microsoft.com/homepage/gif/bnr-microsoft.gif" />
</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 ImageButton - TagKey - VB.NET Example</title>
<script runat="server">
Sub ImageButton1_Command(sender As Object, e As CommandEventArgs)
' Redirect to the Microsoft home page.
Response.Redirect("http://www.microsoft.com/")
End Sub
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom ImageButton - TagKey - VB.NET Example</h3>
<aspSample:CustomImageButtonTagKey id="ImageButton1" runat="server"
OnCommand="ImageButton1_Command" AlternateText="Microsoft Home"
ImageUrl="http://www.microsoft.com/homepage/gif/bnr-microsoft.gif" />
</form>
</body>
</html>
using System.Web;
using System.Security.Permissions;
namespace Samples.AspNet.CS.Controls
{
[AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
public sealed class CustomImageButtonTagKey : System.Web.UI.WebControls.ImageButton
{
protected override System.Web.UI.HtmlTextWriterTag TagKey
{
get
{
// Specify that only the Input HTML tag can be passed to the HtmlTextWriter.
return System.Web.UI.HtmlTextWriterTag.Input;
}
}
}
}
<AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class CustomImageButtonTagKey
Inherits System.Web.UI.WebControls.ImageButton
Protected Overrides ReadOnly Property TagKey() As System.Web.UI.HtmlTextWriterTag
Get
' Specify that only the Input HTML tag can be passed to the HtmlTextWriter.
Return System.Web.UI.HtmlTextWriterTag.Input
End Get
End Property
End Class
注解
从控件派生自定义类ImageButton时，该TagKey属性主要由控件开发人员使用。
使用 TagKey 属性确定 HtmlTextWriterTag 与 ImageButton 控件关联的值。 此属性重写要始终返回 HtmlTextWriterTag.Input的基本实现。
