DataList.RenderContents(HtmlTextWriter) Método

Referencia

Definición

Espacio de nombres:: System.Web.UI.WebControls

Ensamblado:: System.Web.dll

Importante

Parte de la información hace referencia a la versión preliminar del producto, que puede haberse modificado sustancialmente antes de lanzar la versión definitiva. Microsoft no otorga ninguna garantía, explícita o implícita, con respecto a la información proporcionada aquí.

Representa los elementos de lista del control DataList.

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)

Parámetros

writer: HtmlTextWriter

HtmlTextWriter que representa el flujo de salida para representar contenido HTML en el cliente.

Ejemplos

En el ejemplo de código siguiente se muestra cómo invalidar el RenderContents método en un control de servidor personalizado para que algún texto preceda al DataList objeto .

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet" 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 DataList - RenderContents - C# Example</title>
        <script runat="server">
          private void Page_Load(object sender, System.EventArgs e)
          {
        // Create sample data for the DataList control.
        System.Data.DataTable dt = new System.Data.DataTable();
        System.Data.DataRow dr;
        dt.Columns.Add(new System.Data.DataColumn("Column1", typeof(String)));
        
        dr = dt.NewRow();
        dr[0] = "Hello";
        dt.Rows.Add(dr);
        
        dr = dt.NewRow();
        dr[0] = "DataList";
        dt.Rows.Add(dr);
        
        dr = dt.NewRow();
        dr[0] = "World";
        dt.Rows.Add(dr);

        // Show the DataTable values in the DataList.
              DataList1.DataSource = dt;
        DataList1.DataBind();
        }        
        </script>
    </head>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom DataList - RenderContents - C# Example</h3>

            <aspSample:CustomDataListRenderContents id="DataList1" runat="server" 
                BorderColor="#999999" BorderStyle="None" BackColor="White" CellPadding="3" 
                GridLines="Vertical" BorderWidth="1px" Width="100px">
        
          <HeaderStyle Font-Bold="True" ForeColor="White" BackColor="#000084" />
          <HeaderTemplate>
              <asp:Label id="Label1" runat="server">Column1</asp:Label>
          </HeaderTemplate>

          <ItemStyle ForeColor="Black" BackColor="#EEEEEE" />
          <ItemTemplate>
              <asp:Label id="Label2" runat="server"><%# DataBinder.Eval(Container.DataItem, "Column1") %></asp:Label>
          </ItemTemplate>

          <AlternatingItemStyle BackColor="#DCDCDC" />
          <AlternatingItemTemplate>
              <asp:Label id="Label3" runat="server"><%# DataBinder.Eval(Container.DataItem, "Column1") %></asp:Label>
          </AlternatingItemTemplate>
          
      </aspSample:CustomDataListRenderContents>
        </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 DataList - RenderContents - VB.NET Example</title>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">
      <h3>Custom DataList - RenderContents - VB.NET Example</h3>
      <aspSample:CustomDataListRenderContents id="DataList1" runat="server" />
    </form>
  </body>
</html>

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

namespace Samples.AspNet
{
    [AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
    public sealed class CustomDataListRenderContents : System.Web.UI.WebControls.DataList
    {
        protected override void RenderContents(System.Web.UI.HtmlTextWriter writer)
        {
            // Place some text before the DataList.
            writer.Write("Here is some text from the RenderContent method.<br>");

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

Imports System.Web
Imports System.Security.Permissions

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

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

            ' Place some text before the DataList.
            writer.Write("Here is some text from the RenderContent method.<br>")

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

Comentarios

El RenderContents método se usa principalmente por los desarrolladores de controles, al derivar un control personalizado del DataList control .

El RenderContents método representa el contenido interno del DataList control, incluidos los controles contenidos DataListItem .

Se aplica a

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