TextBox.TagKey TextBox.TagKey TextBox.TagKey TextBox.TagKey Property

定義

取得文字方塊控制項的 HTML 標記。Gets the HTML tag for the text box control. 這個屬性受到保護。This property is protected.

protected:
 virtual property System::Web::UI::HtmlTextWriterTag TagKey { System::Web::UI::HtmlTextWriterTag get(); };
protected override System.Web.UI.HtmlTextWriterTag TagKey { get; }
member this.TagKey : System.Web.UI.HtmlTextWriterTag
Protected Overrides ReadOnly Property TagKey As HtmlTextWriterTag

屬性值

如果文字方塊為多行,則為 Textarea,否則為 InputTextarea if the text box is multiline; otherwise, Input.

範例

下列程式碼範例示範如何使用TagKey屬性來建立自訂文字方塊。The following code example demonstrates how to use the TagKey property to create a custom text box.

重要

這個範例有一個可接受使用者輸入的文字方塊,這可能會造成安全性威脅。This example has a text box that accepts user input, which is a potential security threat. 根據預設,ASP.NET Web 網頁會驗證使用者輸入未包含指令碼或 HTML 項目。By default, ASP.NET Web pages validate that user input does not include script or HTML elements. 如需詳細資訊,請參閱 Script Exploits Overview (指令碼攻擊概觀)。For more information, see Script Exploits Overview.

<%@ 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 TextBox - TagKey - C# Example</title>
    </head>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom TextBox - TagKey - C# Example</h3>
            
            <aspSample:CustomTextBoxTagKey 
              id="TextBox1" 
              runat="server">Hello World!
            </aspSample:CustomTextBoxTagKey>
            
        </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 TextBox - TagKey - VB.NET Example</title>
    </head>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom TextBox - TagKey - VB.NET Example</h3>
            
            <aspSample:CustomTextBoxTagKey 
              id="TextBox1" 
              runat="server">Hello World!
          </aspSample:CustomTextBoxTagKey>
          
        </form>
    </body>
</html>
using System.Web;
using System.Security.Permissions;

namespace Samples.AspNet.CS.Controls
{
  [AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.Minimal)]
  public sealed class CustomTextBoxTagKey : System.Web.UI.WebControls.TextBox
  {
    protected override System.Web.UI.HtmlTextWriterTag TagKey
    {
      get 
      {
        // If the TextMode is MultiLine, return a Textarea tag, 
        // else return an Input tag.
        if (this.TextMode == System.Web.UI.WebControls.TextBoxMode.MultiLine)
        {
          return System.Web.UI.HtmlTextWriterTag.Textarea;
        }
        else
        {
          return System.Web.UI.HtmlTextWriterTag.Input;
        }
      }
    }
  }
}
Imports System.Web
Imports System.Security.Permissions

Namespace Samples.AspNet.VB.Controls
    <AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
    Public NotInheritable Class CustomTextBoxTagKey
        Inherits System.Web.UI.WebControls.TextBox

        Protected Overrides ReadOnly Property TagKey() As System.Web.UI.HtmlTextWriterTag
            Get
                ' If the TextMode is MultiLine, return a Textarea tag, else return an Input tag.
                If Me.TextMode = System.Web.UI.WebControls.TextBoxMode.MultiLine Then
                    Return System.Web.UI.HtmlTextWriterTag.Textarea
                Else
                    Return System.Web.UI.HtmlTextWriterTag.Input
                End If
            End Get
        End Property
    End Class
End Namespace

適用於