Image.RenderContents(HtmlTextWriter) Método

Referência

Definição

Namespace:: System.Web.UI.WebControls

Assembly:: System.Web.dll

Importante

Algumas informações se referem a produtos de pré-lançamento que podem ser substancialmente modificados antes do lançamento. A Microsoft não oferece garantias, expressas ou implícitas, das informações aqui fornecidas.

Renderiza o conteúdo de controle da imagem para o gravador especificado.

protected:
 override void RenderContents(System::Web::UI::HtmlTextWriter ^ writer);

protected public:
 override void RenderContents(System::Web::UI::HtmlTextWriter ^ writer);

protected override void RenderContents (System.Web.UI.HtmlTextWriter writer);

protected internal override void RenderContents (System.Web.UI.HtmlTextWriter writer);

override this.RenderContents : System.Web.UI.HtmlTextWriter -> unit

Protected Overrides Sub RenderContents (writer As HtmlTextWriter)

Protected Friend Overrides Sub RenderContents (writer As HtmlTextWriter)

Parâmetros

writer: HtmlTextWriter

Um HtmlTextWriter que representa o fluxo de saída para renderizar o conteúdo HTML no cliente.

Exemplos

O exemplo de código a seguir demonstra como substituir o RenderContents método em um controle de servidor personalizado para que algum texto seja sempre exibido após o Image.

<%@ 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 Image - RenderContents - C# Example</title>
    </head>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom Image - RenderContents - C# Example</h3>
            
            <aspSample:CustomImageRenderContents 
              id="Image1" 
              runat="server" 
              ImageUrl="http://www.microsoft.com/homepage/gif/bnr-microsoft.gif" 
              AlternateText="Microsoft Home" />
            
        </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 Image - RenderContents - VB.NET Example</title>
    </head>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom Image - RenderContents - VB.NET Example</h3>
            
            <aspSample:CustomImageRenderContents id="Image1" runat="server" 
             ImageUrl="http://www.microsoft.com/homepage/gif/bnr-microsoft.gif" 
             AlternateText="Microsoft Home" />
            
        </form>
    </body>
</html>

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

namespace Samples.AspNet.CS.Controls
{
  [AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.Minimal)]
  public sealed class CustomImageRenderContents : System.Web.UI.WebControls.Image
  {
    protected override void RenderContents(System.Web.UI.HtmlTextWriter writer)
    {
      // Call the base RenderContents method.
      base.RenderContents(writer);

      // Append some text to the Image.
      writer.Write("<BR>Experience Windows Server 2003 and Visual Studio® .NET 2003.");
    }
  }
}

<AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class CustomImageRenderContents
    Inherits System.Web.UI.WebControls.Image

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

        ' Call the base RenderContents method.
        MyBase.RenderContents(writer)

        ' Append some text to the Image.
        writer.Write("<BR>Experience Windows Server 2003 and Visual Studio .NET 2003.")
    End Sub
End Class

Comentários

O RenderContents método é usado principalmente por desenvolvedores de controle. O Image controle implementa o RenderContents método para ignorar a renderização de qualquer controle filho.

Aplica-se a

Confira também

RenderContents(HtmlTextWriter)

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