HttpResponse.Filter HttpResponse.Filter HttpResponse.Filter HttpResponse.Filter Property

Definition

Obtiene o establece un objeto de filtro contenedor que se emplea para modificar el cuerpo de la entidad HTTP antes de la transmisión. Gets or sets a wrapping filter object that is used to modify the HTTP entity body before transmission.

public:
 property System::IO::Stream ^ Filter { System::IO::Stream ^ get(); void set(System::IO::Stream ^ value); };
public System.IO.Stream Filter { get; set; }
member this.Filter : System.IO.Stream with get, set
Public Property Filter As Stream

Property Value

Objeto Stream que actúa como filtro de salida. The Stream object that acts as the output filter.

Exceptions

No se permite el filtrado con la entidad. Filtering is not allowed with the entity.

Examples

El ejemplo siguiente es una página ASP.NET que establece el Filter propiedad a una nueva instancia de la UpperCaseFilter clase personalizada Stream clase que convierte todo el texto que se pasa a mayúsculas.The following example is an ASP.NET page that sets the Filter property to a new instance of the UpperCaseFilter class, a custom Stream class that converts all text that passes through it to uppercase. La información acerca de la solicitud se guarda en un archivo de texto y, a continuación, el Filter se establece la propiedad.The information about the request is saved to a text file, and then the Filter property is set. Una vez implementado el filtro de respuesta, el código llama a la MapPath método para obtener la ruta de acceso absoluta a un archivo de texto denominado TestFile.txt que actúa como el origen del contenido de la respuesta.After the response filter is in place, the code calls the MapPath method to get the absolute path to a text file named TestFile.txt that serves as the source for the content of the response. El código, a continuación, crea un nuevo StreamReader objeto para leer el archivo de texto de principio a fin y, a continuación, llama a la Write método para mostrar el contenido del archivo en la página.The code then creates a new StreamReader object to read the text file from beginning to end, and then calls the Write method to display the content of the file on the page.

<%@ Page Language="C#" %>
<%@ Import Namespace="System.IO" %>
<%@ import Namespace="Samples.AspNet.CS.Controls"  %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

    private void Page_Load(object sender, EventArgs e)
    {

      // Filter the text to be rendered as all uppercase.
      Response.Filter = new UpperCaseFilterStream(Response.Filter);

      // Convert a virtual path to a fully qualified physical path.
      string fullpath = Request.MapPath("~\\TestFile.txt");

      try
      {
        // Read the contents of the file using a StreamReader.
        using (StreamReader sr = new StreamReader(fullpath))
        while (sr.Peek() >= 0)
        {
          Response.Write((char)sr.Read());
        }
        Message.Text = "Reading the file was successful.";
        
      }
      catch (Exception ex)
      {
        Message.Text = "The process failed.";
      }    
     }

</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>HttpResponse.MapPath Example</title>
  </head>
  <body>
    <form id="form1" runat="server">

      <asp:Label id="Message" 
                 runat="server"/>

    </form>
  </body>
</html>
<%@ Page Language="VB" Debug="true"%>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="Samples.AspNet.VB.Controls" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
     
  Private Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
      
    ' Filter the text to be rendered as all uppercase.
    Response.Filter = New UpperCaseFilterStream(Response.Filter)
    
    ' Convert a virtual path to a fully qualified physical path.
    Dim fullpath As String = Request.MapPath("~\\TestFile.txt")
    
    Try
      
      Dim sr As StreamReader = New StreamReader(fullpath)
      
      Do While sr.Peek() >= 0
        Response.Write(Convert.ToChar(sr.Read()))
      Loop
      sr.Close()
      Message.Text = "Reading the file was successful."
      
    Catch ex As Exception
      
      Message.Text = "The process failed."

    End Try

    
  End Sub

</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>HttpResponse.MapPath Example</title>
  </head>
  <body>
    <form id="Form1" runat="server">

      <asp:Label id="Message" 
                 runat="server"/>

    </form>
  </body>
</html>

Remarks

Cuando se crea un Stream de objeto y establecer el Filter propiedad a la Stream objeto, todos los elementos HTTP salida enviado por Write pasa a través del filtro.When you create a Stream object and set the Filter property to the Stream object, all HTTP output sent by Write passes through the filter.

Applies to