ImageButton.TagKey 属性

  • 参考

定义

命名空间:
System.Web.UI.WebControls
程序集:
System.Web.dll

获取与 HtmlTextWriterTag 控件相对应的 ImageButton 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.HtmlTextWriterTag
Protected Overrides ReadOnly Property TagKey As HtmlTextWriterTag

属性值

HtmlTextWriterTag

一个 HtmlTextWriterTag 枚举值。

属性
BrowsableAttribute

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，使其始终返回 Input 标记。

注意

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。 第二个部分必须位于用于 C#) 的 .cs 文件 (中，或位于 Visual Basic) (的 .vb 文件中。 有关Web Forms代码模型的详细信息，请参阅 ASP.NET Web Forms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 TagKey 控件派生自定义类 ImageButton 时，控件开发人员主要使用 属性。

TagKey使用 属性确定与HtmlTextWriterTag控件ImageButton关联的值。 此属性重写基实现，以始终返回 HtmlTextWriterTag.Input。

适用于

另请参阅