Literal.CreateControlCollection Metodo

  • Riferimento

Definizione

Spazio dei nomi:
System.Web.UI.WebControls
Assembly:
System.Web.dll

Crea un oggetto EmptyControlCollection per l'istanza corrente del controllo Literal.

protected:
 override System::Web::UI::ControlCollection ^ CreateControlCollection();
protected override System.Web.UI.ControlCollection CreateControlCollection ();
override this.CreateControlCollection : unit -> System.Web.UI.ControlCollection
Protected Overrides Function CreateControlCollection () As ControlCollection

Restituisce

ControlCollection

Oggetto ControlCollection che contiene i controlli server figlio del controllo server corrente.

Esempio

Nell'esempio di codice seguente viene illustrato come eseguire l'override del CreateControlCollection metodo in un controllo server personalizzato in modo che restituisca sempre un'istanza della EmptyControlCollection classe per l'oggetto Literal .

<%@ 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 LiteralControl - CreateControlCollection - C# Example</title>
       <script runat="server">
      void Button1_Click(Object sender, EventArgs e)
      {
         Literal1.Text = "Welcome to ASP.NET!";
      }
   </script>
    </head>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom LiteralControl - CreateControlCollection - C# Example</h3>
            
            <aspSample:CustomLiteralCreateControlCollection id="Literal1" 
              runat="server" text="Literal Text" />

      <br /><br />

      <asp:Button id="Button1"
        Text="Change"
        OnClick="Button1_Click"
        runat="server"/>
        </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 LiteralControl - CreateControlCollection - VB.Net Example</title>
       <script runat="server">
      Sub Button1_Click(sender As Object, e As EventArgs)
      
         Literal1.Text = "Welcome to ASP.NET!"
      
      End Sub

   </script>
    </head>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom LiteralControl - CreateControlCollection - VB.Net Example</h3>
            
            <aspSample:CustomLiteralCreateControlCollection id="Literal1" 
              runat="server" text="Literal Text" />

      <br /><br />

      <asp:Button id="Button1"
        Text="Change"
        OnClick="Button1_Click"
        runat="server"/>
        </form>
    </body>
</html>

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

namespace Samples.AspNet.CS.Controls
{
  [AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.Minimal)]
  public sealed class CustomLiteralCreateControlCollection : System.Web.UI.LiteralControl
  {
    protected override System.Web.UI.ControlCollection CreateControlCollection()
    {
      // Return a new EmptyControlCollection
      return new System.Web.UI.EmptyControlCollection(this);
    }
  }
}

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

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

        ' Return a new EmptyControlCollection
        Return New System.Web.UI.EmptyControlCollection(Me)
    End Function
End Class

Si applica a

Vedi anche