WebPartZoneBase.CreateVerbs Evento

  • Riferimento

Definizione

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

Si verifica alla creazione dei verbi di una zona derivata dalla classe WebPartZoneBase.

public:
 event System::Web::UI::WebControls::WebParts::WebPartVerbsEventHandler ^ CreateVerbs;
public event System.Web.UI.WebControls.WebParts.WebPartVerbsEventHandler CreateVerbs;
member this.CreateVerbs : System.Web.UI.WebControls.WebParts.WebPartVerbsEventHandler 
Public Custom Event CreateVerbs As WebPartVerbsEventHandler

Tipo evento

WebPartVerbsEventHandler

Esempio

Nell'esempio di codice seguente viene illustrato un modo per creare un gestore per l'evento eseguendo l'override CreateVerbs del OnCreateVerbs metodo per aggiungere un verbo personalizzato a una zona derivata WebPartZoneBase .

L'esempio di codice contiene due file di origine. Per eseguire l'esempio di codice, è necessario compilare questo codice sorgente. È possibile compilarlo in modo esplicito e inserire l'assembly risultante nella cartella Bin del sito Web o nella Global Assembly Cache. In alternativa, è possibile inserire il codice sorgente nella cartella App_Code del sito, in cui verrà compilato in modo dinamico in fase di esecuzione. In questo esempio di codice viene usata la compilazione dinamica. Per una procedura dettagliata che illustra come eseguire la compilazione, vedere Procedura dettagliata: sviluppo e uso di un controllo server Web personalizzato.

La prima parte dell'esempio di codice è il codice sorgente per un controllo semplice derivato dalla WebPart classe .

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Security.Permissions;
using System.Collections.Generic;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

namespace Samples.AspNet.CS.Controls
{

    // This code snippet creates a simple Web Part control.
    [AspNetHostingPermission(SecurityAction.Demand,
      Level = AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand,
      Level = AspNetHostingPermissionLevel.Minimal)]
    public class SimpleControl : WebPart
    {

        private String _text = "Simple control text";

        public string Text
        {
            get
            {
                if (_text != null)
                    return _text;
                else
                    return string.Empty;
            }
            set { _text = value; }
        }

        protected override void Render(System.Web.UI.HtmlTextWriter 
      writer)
        {
            writer.Write(this.Text);
        }
    }
}

Imports System.Data
Imports System.Configuration
Imports System.Web
Imports System.Web.Security
Imports System.Collections.Generic
Imports System.Security.Permissions
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.Web.UI.WebControls.WebParts
Imports System.Web.UI.HtmlControls

' This code snippet creates a simple Web Part control.
Namespace Samples.AspNet.VB.Controls

  <AspNetHostingPermission(SecurityAction.Demand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  <AspNetHostingPermission(SecurityAction.InheritanceDemand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  Public Class SimpleControl
    Inherits System.Web.UI.WebControls.WebParts.WebPart

    Private _text As String = "Simple control text"

    Public Property [Text]() As String
      Get
        If Not (_text Is Nothing) Then
          Return _text
        Else
          Return String.Empty
        End If
      End Get
      Set(ByVal value As String)
        _text = value
      End Set
    End Property

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

      writer.Write(Me.Text)

    End Sub

  End Class

End Namespace

La seconda parte dell'esempio di codice è il codice sorgente per una zona derivata WebPartZoneBase che esegue l'override del OnCreateVerbs metodo per aggiungere un verbo personalizzato alla zona. Il codice crea anche un verbo personalizzato visualizzato nel menu dei verbi dei WebPart controlli contenuti nella zona e il verbo crea un'altra copia del controllo corrente WebPart .

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Security.Permissions;
using System.Collections.Generic;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

namespace Samples.AspNet.CS.Controls
{
/* 
This code sample creates a Web Part zone and adds the 
"Copy Web Part" verb to any control in the zone.
*/
[AspNetHostingPermission(SecurityAction.Demand,
    Level = AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermission(SecurityAction.InheritanceDemand,
    Level = AspNetHostingPermissionLevel.Minimal)]
public class ZoneWithAddedVerb : WebPartZone
{

  protected override void OnCreateVerbs(WebPartVerbsEventArgs e)
  {
    List<WebPartVerb> newVerbs = new List<WebPartVerb>();
    newVerbs.Add(new CopyWebPartVerb(CopyWebPartToNewOne));
    e.Verbs = new WebPartVerbCollection(e.Verbs,newVerbs);
    base.OnCreateVerbs(e);
  }

  void CopyWebPartToNewOne(object sender, WebPartEventArgs e)
  {
    WebPartManager wpmgr = 
      WebPartManager.GetCurrentWebPartManager(Page);
    System.Web.UI.WebControls.WebParts.WebPart wp;
    Type tp = e.WebPart.GetType(); 
    wp = (System.Web.UI.WebControls.WebParts.WebPart)Activator.CreateInstance(tp);   
    wpmgr.AddWebPart(wp, e.WebPart.Zone, e.WebPart.ZoneIndex + 1);
  }
}
  [AspNetHostingPermission(SecurityAction.Demand,
    Level = AspNetHostingPermissionLevel.Minimal)]
  [AspNetHostingPermission(SecurityAction.InheritanceDemand,
    Level = AspNetHostingPermissionLevel.Minimal)]
  internal class CopyWebPartVerb : WebPartVerb
  {
    private const String _copyWebPartImageUrl = "~/CopyVerb.ico";

    internal CopyWebPartVerb(WebPartEventHandler serverClickHandler) :  
       base("MyVerb", serverClickHandler)
    { }
    public override string Text
    {
      get { return "Copy Web Part"; }
      set { ;}
    }
    public override string Description
    {
      get { return "This verb will copy this web part control " +
        "to a new one below"; }
      set { ; }
    }
    public override bool Enabled
    {
      get { return base.Enabled; }
      set { base.Enabled = value; }
    }
    
    public override string ImageUrl
    {
      get { return _copyWebPartImageUrl; }
      set { ; }
    }
  }
}

Imports System.Data
Imports System.Configuration
Imports System.Web
Imports System.Web.Security
Imports System.Security.Permissions
Imports System.Collections.Generic
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.Web.UI.WebControls.WebParts
Imports System.Web.UI.HtmlControls

' This code sample creates a Web Part zone and adds the 
' "Copy Web Part" verb to any control in the zone.
Namespace Samples.AspNet.VB.Controls

  <AspNetHostingPermission(SecurityAction.Demand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  <AspNetHostingPermission(SecurityAction.InheritanceDemand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  Public Class ZoneWithAddedVerb
    Inherits WebPartZone

    'public class ExtendedWebPartZoneBase 
    Protected Overrides Sub OnCreateVerbs(ByVal e _
      As WebPartVerbsEventArgs)

      Dim newVerbs As List(Of WebPartVerb) = _
        New List(Of WebPartVerb)
      newVerbs.Add(New CopyWebPartVerb(AddressOf CopyWebPartToNewOne))
      e.Verbs = New WebPartVerbCollection(e.Verbs, newVerbs)
      MyBase.OnCreateVerbs(e)

    End Sub


    Sub CopyWebPartToNewOne(ByVal sender As Object, _
      ByVal e As WebPartEventArgs)

      Dim wpmgr As WebPartManager = _
        WebPartManager.GetCurrentWebPartManager(Page)
      Dim wp As System.Web.UI.WebControls.WebParts.WebPart
      Dim tp As Type = e.WebPart.GetType()
      wp = CType(Activator.CreateInstance(tp), _
        System.Web.UI.WebControls.WebParts.WebPart)
      wpmgr.AddWebPart(wp, e.WebPart.Zone, e.WebPart.ZoneIndex + 1)

    End Sub

  End Class


  <AspNetHostingPermission(SecurityAction.Demand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  <AspNetHostingPermission(SecurityAction.InheritanceDemand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  Friend Class CopyWebPartVerb
    Inherits WebPartVerb
    Private Const _copyWebPartImageUrl As String = "~/CopyVerb.ico"

    Friend Sub New(ByVal serverClickHandler As WebPartEventHandler)
      MyBase.New("MyVerb", serverClickHandler)

    End Sub

    Public Overrides Property [Text]() As String
      Get
        Return "Copy Web Part"
      End Get
      Set(ByVal value As String)
      End Set
    End Property

    Public Overrides Property Description() As String
      Get
        Return "This verb will copy this web part control to a " _
               & "new one below"
      End Get
      Set(ByVal value As String)
      End Set
    End Property

    Public Overrides Property Enabled() As Boolean
      Get
        Return MyBase.Enabled
      End Get
      Set(ByVal value As Boolean)
        MyBase.Enabled = value
      End Set
    End Property
    
    Public Overrides Property ImageUrl() As String
      Get
        Return Me._copyWebPartImageUrl
      End Get
      Set(ByVal value As String)
      End Set
    End Property

  End Class

End Namespace

La terza parte dell'esempio di codice è una pagina Web che ospita la zona e WebPart il controllo derivati. Nella parte superiore della pagina è presente una Register direttiva per fare riferimento al componente della zona derivata. Se si carica la pagina in un browser, il WebPart controllo viene visualizzato nell'area. Fare clic sul menu dei verbi, quindi sul verbo CopyWebPart e creare una copia del controllo.

<%@ Page Language="C#" %>
<%@ Register TagPrefix="verbsample" 
    namespace="Samples.AspNet.CS.Controls" %>

<!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 runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <asp:WebPartManager ID="WebPartManager1" runat="server" />
    <verbsample:ZoneWithAddedVerb id="ZoneWithAddedVerb1" 
      HeaderText="Zone with Added Verb" runat="server">
        <ZoneTemplate>
           <verbsample:SimpleControl id="SimpleControl1" 
            title="Simple Control" runat="server" /> 
        </ZoneTemplate>
        </verbsample:ZoneWithAddedVerb>
     </form>
</body>
</html>

<%@ Page Language="VB" %>
<%@ Register TagPrefix="verbsample" 
    namespace="Samples.AspNet.VB.Controls" %>

<!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 runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <asp:WebPartManager ID="WebPartManager1" runat="server" />
    <verbsample:ZoneWithAddedVerb id="ZoneWithAddedVerb1" 
      HeaderText="Zone with Added Verb" runat="server">
        <ZoneTemplate>
           <verbsample:SimpleControl id="SimpleControl1" 
            title="Simple Control" runat="server" /> 
        </ZoneTemplate>
        </verbsample:ZoneWithAddedVerb>
     </form>
</body>
</html>

Commenti

Gli sviluppatori di pagine possono aggiungere un gestore a questo evento e allegare verbi personalizzati aggiuntivi a una WebPartZoneBase zona figlio.

L'evento CreateVerbs viene generato quando i verbi vengono creati per una zona, che si verifica durante la PreRender fase di elaborazione della pagina o durante gli eventi di postback.

Si applica a

Vedi anche