HtmlTable.HtmlTableRowControlCollection.Add(Control) Método

Definição

Espaço de Nomes:
System.Web.UI.HtmlControls
Assemblagem:
System.Web.dll

Adiciona o objeto especificado Control à coleção.

public:
 override void Add(System::Web::UI::Control ^ child);
public override void Add(System.Web.UI.Control child);
override this.Add : System.Web.UI.Control -> unit
Public Overrides Sub Add (child As Control)

Parâmetros

child
Control

A Control acrescentar à coleção.

Exceções

ArgumentException

O controlo adicional deve ser do tipo HtmlTableRow.

Exemplos

O exemplo de código seguinte demonstra como criar uma coleção personalizada HtmlTable.HtmlTableRowControlCollection que sobrepõe o Add método para que, quando as linhas são adicionadas a uma tabela, sejam sempre adicionadas no início da coleção de linhas da tabela. Repare como o método personalizado Add chama o método da AddAt classe base com o index parâmetro igual a 0.

<%@ 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 HtmlTable - CustomHtmlTableRowControlCollection Example</title>
  </head>
  <body>
    <form id="Form1" 
          method="post" 
          runat="server">
      <h3>Custom HtmlTable - CustomHtmlTableRowControlCollection Example</h3>
      
      <aspSample:CustomHtmlTableRowControlCollection 
        id="HtmlTable1" 
        name="HtmlTable1" 
        runat="server" 
        border="1"
        cellSpacing="0" 
        cellPadding="5">
        <tr>
          <td>1,1</td>
          <td>1,2</td>
          <td>1,3</td>
        </tr>
        <tr>
          <td>2,1</td>
          <td>2,2</td>
          <td>2,3</td>
        </tr>
        <tr>
          <td>3,1</td>
          <td>3,2</td>
          <td>3,3</td>
        </tr>
      </aspSample:CustomHtmlTableRowControlCollection>

    </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 HtmlTable - CustomHtmlTableRowControlCollection Example</title>
  </head>
  <body>
    <form id="Form1" 
          method="post" 
          runat="server">
      <h3>Custom HtmlTable - CustomHtmlTableRowControlCollection Example</h3>
      
      <aspSample:CustomHtmlTableRowControlCollection 
        id="HtmlTable1" 
        name="HtmlTable1" 
        runat="server" 
        border="1"
        cellSpacing="0" 
        cellPadding="5">
        <tr>
          <td>1,1</td>
          <td>1,2</td>
          <td>1,3</td>
        </tr>
        <tr>
          <td>2,1</td>
          <td>2,2</td>
          <td>2,3</td>
        </tr>
        <tr>
          <td>3,1</td>
          <td>3,2</td>
          <td>3,3</td>
        </tr>
      </aspSample:CustomHtmlTableRowControlCollection>

    </form>

  </body>
</html>

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

namespace Samples.AspNet.CS.Controls
{
    [AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
    public class CustomHtmlTableRowControlCollection : System.Web.UI.HtmlControls.HtmlTable
    {

       protected override ControlCollection CreateControlCollection()
       {

         return new MyHtmlTableRowControlCollection(this);
       }

       protected class MyHtmlTableRowControlCollection : ControlCollection
       {

         internal MyHtmlTableRowControlCollection(Control owner) : base(owner) { }

         public override void Add(Control child)
         {

           // Always add new rows at the top of the table.
           base.AddAt(0, child);
         }
       }
    }
}

Imports System.Web
Imports System.Web.UI
Imports System.Security.Permissions

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

        Protected Overrides Function CreateControlCollection() As System.Web.UI.ControlCollection

            Return New MyHtmlTableRowControlCollection(Me)

        End Function

        Protected Class MyHtmlTableRowControlCollection
            Inherits ControlCollection

            Friend Sub New(ByVal owner As Control)

                MyBase.New(owner)

            End Sub

            Public Overrides Sub Add(ByVal child As Control)

                ' Always add new rows at the top of the table.
                MyBase.AddAt(0, child)

            End Sub

        End Class

    End Class

End Namespace

Observações

O controlo adicional só pode ser um HtmlTableRow controlo; caso contrário, é lançada uma ArgumentException exceção.

Aplica-se a

Ver também