語言

TextBox.AddAttributesToRender(HtmlTextWriter) 方法

定義

命名空間:
System.Web.UI.WebControls
組件:
System.Web.dll

新增需要渲染到指定 HtmlTextWriter 實例的 HTML 屬性與樣式。

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 -> unit
Protected Overrides Sub AddAttributesToRender (writer As HtmlTextWriter)

參數

writer
HtmlTextWriter

一個 HtmlTextWriter 代表輸出串流，用來在客戶端渲染 HTML 內容。

範例

以下程式碼範例示範如何在自訂伺服器控制項中覆寫此 AddAttributesToRender 方法，使 TextBox 控制文字始終顯示為粗體。

Important

此範例中有一個文字框可接受使用者輸入，這可能構成安全威脅。 預設情況下，ASP.NET 網頁會驗證使用者輸入中不包含腳本或 HTML 元素。 欲了解更多資訊，請參閱 腳本漏洞概述。

<%@ 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 - AddAttributesToRender - C# Example</title>
    </head>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom TextBox - AddAttributesToRender - C# Example</h3>
            
            <aspSample:CustomTextBoxAddAttributesToRender 
              id="TextBox1" 
              runat="server">Hello World!
            </aspSample:CustomTextBoxAddAttributesToRender>
            
        </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 - AddAttributesToRender - VB.NET Example</title>
    </head>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom TextBox - AddAttributesToRender - VB.NET Example</h3>
            
            <aspSample:CustomTextBoxAddAttributesToRender id="TextBox1" 
             runat="server">Hello World!</aspSample:CustomTextBoxAddAttributesToRender>
        </form>
    </body>
</html>

using System.Web;
using System.Security.Permissions;

namespace Samples.AspNet.CS.Controls
{
  [AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.Minimal)]
  public sealed class CustomTextBoxAddAttributesToRender : System.Web.UI.WebControls.TextBox
  {
    protected override void AddAttributesToRender(System.Web.UI.HtmlTextWriter writer)
    {
      // Show the TextBox text as Bold.
      writer.AddStyleAttribute(System.Web.UI.HtmlTextWriterStyle.FontWeight, "bold");

      // Call the base AddAttributesToRender method.
      base.AddAttributesToRender(writer);
    }
  }
}

Imports System.Web
Imports System.Security.Permissions

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

        Protected Overrides Sub AddAttributesToRender(ByVal writer As System.Web.UI.HtmlTextWriter)

            ' Show the TextBox text as Bold.
            writer.AddStyleAttribute(System.Web.UI.HtmlTextWriterStyle.FontWeight, "bold")

            ' Call the base AddAttributesToRender method.
            MyBase.AddAttributesToRender(writer)
        End Sub
    End Class
End Namespace

備註

此方法主要由控制項開發者用來在控制項的輸出串流HtmlTextWriter中插入額外的屬性與樣式TextBox。 這個方法會覆寫 WebControl.AddAttributesToRender。

適用於