WebControl.AddAttributesToRender(HtmlTextWriter) Método

Definición

Agrega atributos y estilos HTML que se deben representar en el HtmlTextWriterTag especificado.Adds HTML attributes and styles that need to be rendered to the specified HtmlTextWriterTag. Este método lo usan principalmente los desarrolladores de controles.This method is used primarily by control developers.

protected:
 virtual void AddAttributesToRender(System::Web::UI::HtmlTextWriter ^ writer);
protected virtual void AddAttributesToRender (System.Web.UI.HtmlTextWriter writer);
abstract member AddAttributesToRender : System.Web.UI.HtmlTextWriter -> unit
override this.AddAttributesToRender : System.Web.UI.HtmlTextWriter -> unit
Protected Overridable Sub AddAttributesToRender (writer As HtmlTextWriter)

Parámetros

writer
HtmlTextWriter

HtmlTextWriter que representa el flujo de salida para representar contenido HTML en el cliente.A HtmlTextWriter that represents the output stream to render HTML content on the client.

Ejemplos

En el ejemplo siguiente se muestra cómo crear una clase que deriva de la clase WebControl.The following example demonstrates how to create a class that derives from the WebControl class. La implementación base del método AddAttributesToRender se reemplaza para agregar atributos adecuados a la clase derivada en el flujo de salida HtmlTextWriter.The base implementation of the AddAttributesToRender method is overridden to add attributes appropriate to the derived class in the HtmlTextWriter output stream.

namespace ControlTest 
{
   using System;
   using System.Web.UI;
   using System.Web.UI.WebControls;

   // Renders the following HTML: 
   // <span onclick="alert('Hello');" style="color:Red;">Custom Contents</span>

   public class MyWebControl: WebControl {

      public MyWebControl() : base(HtmlTextWriterTag.Span) 
      { }

      [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")] 
      protected override void AddAttributesToRender(HtmlTextWriter writer) 
      {

         writer.AddAttribute(HtmlTextWriterAttribute.Onclick, "alert('Hello');");
         writer.AddStyleAttribute(HtmlTextWriterStyle.Color, "Red");
         base.AddAttributesToRender(writer);
      }

      [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")] 
      protected override void RenderContents(HtmlTextWriter writer) 
      {
         writer.Write("Custom Contents");
         base.RenderContents(writer);
      }
   }
}


Imports System.Web.UI
Imports System.Web.UI.WebControls

Namespace ControlTest
   
   ' Renders the following HTML: 
   ' <span onclick="alert('Hello');" style="color:Red;">Custom Contents</span>
   Public Class MyWebControl
      Inherits WebControl
      
      
      Public Sub New()
         MyBase.New(HtmlTextWriterTag.Span)
      End Sub
      
      <System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> _
      Protected Overrides Sub AddAttributesToRender(writer As HtmlTextWriter)
         
         writer.AddAttribute(HtmlTextWriterAttribute.Onclick, "alert('Hello');")
         writer.AddStyleAttribute(HtmlTextWriterStyle.Color, "Red")
         MyBase.AddAttributesToRender(writer)

      End Sub

      <System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> _
      Protected Overrides Sub RenderContents(writer As HtmlTextWriter)
         writer.Write("Custom Contents")
         MyBase.RenderContents(writer)
      End Sub

   End Class

End Namespace 'ControlTest

Comentarios

Para representar atributos y estilos para un control de servidor Web en el cliente, normalmente se llama a los métodos AddAttribute y HtmlTextWriter.AddStyleAttribute para insertar cada atributo y estilo de forma individual en el flujo de salida HtmlTextWriter.To render attributes and styles for a Web Server control on the client, you typically call the AddAttribute and HtmlTextWriter.AddStyleAttribute methods to insert each attribute and style individually to the HtmlTextWriter output stream. Para simplificar el proceso, este método encapsula todas las llamadas a los métodos HtmlTextWriter.AddAttribute y HtmlTextWriter.AddStyleAttribute para cada atributo y estilo asociados al control de servidor Web.To simplify the process, this method encapsulates all calls to the HtmlTextWriter.AddAttribute and HtmlTextWriter.AddStyleAttribute methods for every attribute and style associated with the Web server control. Todos los atributos y estilos se insertan en el flujo de salida HtmlTextWriter en una única llamada al método.All attributes and styles are inserted into the HtmlTextWriter output stream in a single method call. Normalmente, los desarrolladores de controles invalidan este método en clases derivadas para insertar los atributos y estilos adecuados en el flujo de salida HtmlTextWriter para la clase.This method is typically overridden by control developers in derived classes to insert the appropriate attributes and styles to the HtmlTextWriter output stream for the class.

Nota

No se puede usar el método AddAttributesToRender para insertar el script de cliente.The AddAttributesToRender method cannot be used to insert client script. Para usar el script de cliente, vea la clase ClientScriptManager.To use client script, see the ClientScriptManager class.

Se aplica a

Consulte también: