WebResourceAttribute Clase

Definición

public ref class WebResourceAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Assembly, AllowMultiple=true)]
public sealed class WebResourceAttribute : Attribute

type WebResourceAttribute = class
    inherit Attribute

Public NotInheritable Class WebResourceAttribute
Inherits Attribute

Herencia

Object

Attribute

WebResourceAttribute

Atributos

AttributeUsageAttribute

Ejemplos

Esta sección contiene dos ejemplos de código.This section contains two code examples. En el primer ejemplo de código se muestra cómo WebResourceAttribute aplicar el atributo a un espacio de nombres que define MyCustomControlun control personalizado,.The first code example demonstrates how to apply the WebResourceAttribute attribute to a namespace that defines a custom control, MyCustomControl. En el segundo ejemplo de código se muestra cómo MyCustomControl usar la clase en una página web.The second code example demonstrates how to use the MyCustomControl class in a Web page.

En el ejemplo de código siguiente se muestra cómo WebResourceAttribute aplicar el atributo en un ensamblado personalizado para definir un recurso Web de imagen y un recurso web HTML.The following code example demonstrates how to apply the WebResourceAttribute attribute on a custom assembly to define an image Web resource and an HTML Web resource. La MyCustomControl clase define un control compuesto que utiliza los recursos para establecer el valor de la ImageUrl propiedad de un Image control que se encuentra dentro del control compuesto y para establecer la HRef propiedad de un HtmlAnchor Controle el vínculo al recurso HTML.The MyCustomControl class defines a composite control that uses the resources to set the value of the ImageUrl property of an Image control that is contained within the composite control and to set the HRef property of an HtmlAnchor control linking to the HTML resource.

using System;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;

[assembly: WebResource("image1.jpg", "image/jpeg")]
[assembly: WebResource("help.htm", "text/html", PerformSubstitution=true)]
namespace Samples.AspNet.CS.Controls
{

    public class MyCustomControl : Control
    {

        [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")]
        protected override void CreateChildControls()
        {
            
            // Create a new Image control.
            Image _img = new Image();
            _img.ImageUrl = this.Page.ClientScript.GetWebResourceUrl(typeof(MyCustomControl), "image1.jpg");
            this.Controls.Add(_img);

            // Create a new Label control.
            Label _lab = new Label();
            _lab.Text = "A composite control using the WebResourceAttribute class.";
            this.Controls.Add(_lab);

            // Create a new HtmlAnchor control linking to help.htm.
            HtmlAnchor a = new HtmlAnchor();
            a.HRef = this.Page.ClientScript.GetWebResourceUrl(typeof(MyCustomControl), "help.htm");
            a.InnerText = "help link";
            this.Controls.Add(new LiteralControl("<br />"));
            this.Controls.Add(a);

        }
    }

}

Imports System.Web
Imports System.Web.Security
Imports System.Web.UI
Imports System.Web.UI.HtmlControls
Imports System.Web.UI.WebControls

<Assembly: WebResource("image1.gif", "image/jpeg")> 
<Assembly: WebResource("help.htm", "text/html", PerformSubstitution:=True)> 
Namespace Samples.AspNet.VB.Controls

    Public Class MyCustomControl
        Inherits Control

        <System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> _
        Protected Overrides Sub CreateChildControls()

            ' Create a new Image control.
            Dim _img As New Image()
            _img.ImageUrl = Me.Page.ClientScript.GetWebResourceUrl(GetType(MyCustomControl), "image1.jpg")
            Me.Controls.Add(_img)

            ' Create a new Label control.
            Dim _lab As New Label()
            _lab.Text = "A composite control using the WebResourceAttribute class."
            Me.Controls.Add(_lab)

            ' Create a new HtmlAnchor control linking to help.htm.
            Dim a As HtmlAnchor = New HtmlAnchor()
            a.HRef = Me.Page.ClientScript.GetWebResourceUrl(GetType(MyCustomControl), "help.htm")
            a.InnerText = "help link"
            Me.Controls.Add(New LiteralControl("<br />"))
            Me.Controls.Add(a)

        End Sub
    End Class

End Namespace

En el ejemplo de código siguiente se muestra cómo MyCustomControl usar la clase en una página web.The following code example demonstrates how to use the MyCustomControl class in a Web page.

<%@ Page Language="C#" %>
<%@ Register TagPrefix="AspNetSamples" Namespace="Samples.AspNet.CS.Controls" Assembly="Samples.AspNet.CS.Controls" %>
<%@ Import Namespace="System.Reflection" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

  protected void Page_Load(object sender, EventArgs e)
  {
            
    // Get the assembly metatdata.
    Type clsType = typeof(MyCustomControl);
    Assembly a = clsType.Assembly;

    // Iterate through the attributes for the assembly.
    foreach (Attribute attr in Attribute.GetCustomAttributes(a))
    {
      //Check for WebResource attributes.
      if (attr.GetType() == typeof(WebResourceAttribute))
      {
        WebResourceAttribute wra = (WebResourceAttribute)attr;
        Response.Write("Resource in the assembly: " + wra.WebResource.ToString() +
          " with ContentType = " + wra.ContentType.ToString() +
          " and PerformsSubstitution = " + wra.PerformSubstitution.ToString() + "</br>");
      }
    }
  }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>WebResourceAttribute Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <AspNetSamples:MyCustomControl id="MyCustomControl1" runat="server">
      </AspNetSamples:MyCustomControl>    
    </div>
    </form>
</body>
</html>

<%@ Page Language="VB" %>
<%@ Register TagPrefix="AspNetSamples" Namespace="Samples.AspNet.VB.Controls" Assembly="Samples.AspNet.VB.Controls" %>
<%@ Import Namespace="System.Reflection" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

  Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)

    ' Get the assembly metatdata.
    Dim clsType As Type = GetType(MyCustomControl)
    Dim a As Assembly = clsType.Assembly
    
    For Each attr As Attribute In Attribute.GetCustomAttributes(a)
      'Check for WebResource attributes.
      If attr.GetType() Is GetType(WebResourceAttribute) Then
        Dim wra As WebResourceAttribute = CType(attr, WebResourceAttribute)
        Response.Write("Resource in the assembly: " & wra.WebResource.ToString() & _
        " with ContentType = " & wra.ContentType.ToString() & _
        " and PerformsSubstitution = " & wra.PerformSubstitution.ToString() & "</br>")
      End If
    Next attr
    
    
  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>WebResourceAttribute Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <AspNetSamples:MyCustomControl id="MyCustomControl1" runat="server">
      </AspNetSamples:MyCustomControl>    
    </div>
    </form>
</body>
</html>

En este ejemplo, es necesario compilar los recursos image1. jpg y help. htm con el MyCustomControlensamblado que contiene.This example requires that you compile the Image1.jpg and Help.htm resources with the assembly that contains MyCustomControl. Para obtener más información, vea, /ResourceC# (opciones del compilador) o /Resource (Visual Basic).For more information, see, /resource (C# Compiler Options) or /resource (Visual Basic).

A continuación se muestra un ejemplo de un recurso web HTML que podría usarse en este ejemplo.An example of an HTML Web resource that could be used in this example is shown next. Tenga en cuenta el uso WebResource de la sintaxis, que se usa cuando se PerformSubstitution establece la true propiedad en para un recurso Web.Note the use of the WebResource syntax, which is used when you set the PerformSubstitution property to true for a Web resource.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html >

<head>

<title>Included Help Page</title>

</head>

<body>

<div>

<img alt="help image" src=<% = WebResource("image1.jpg") %> />

Included help file.

</div>

</body>

</html>

Comentarios

La WebResourceAttribute clase solo es válida cuando se usa en declaraciones de ensamblado.The WebResourceAttribute class is valid only when used on assembly declarations. Se utiliza para habilitar un recurso incrustado especificado en un ensamblado para su uso como un recurso Web.It is used to enable a specified embedded resource in an assembly for use as a Web resource.

Para obtener más información sobre los recursos, consulte información general sobre los recursos de página web de ASP.net.For more information on resources, see ASP.NET Web Page Resources Overview.

Constructores

Propiedades

Métodos

Implementaciones de interfaz explícitas

Se aplica a

Consulte también:

• Attribute
• Información general de los recursos de página web de ASP.NETASP.NET Web Page Resources Overview
• Recursos en aplicacionesResources in Applications
• /Resource (incrustar archivo de recursos en laC# salida) (opciones del compilador)/resource (Embed Resource File to Output) (C# Compiler Options)
• /resource (Visual Basic)/resource (Visual Basic)
• Empaquetar e implementar recursosPackaging and Deploying Resources