WebPartVerb.ImageUrl Proprietà

Definizione

Spazio dei nomi:

System.Web.UI.WebControls.WebParts

Assembly:

System.Web.dll

Ottiene o imposta una stringa contenente un URL a un'immagine che rappresenta un verbo nell'interfaccia utente.

public:
 virtual property System::String ^ ImageUrl { System::String ^ get(); void set(System::String ^ value); };

public virtual string ImageUrl { get; set; }

member this.ImageUrl : string with get, set

Public Overridable Property ImageUrl As String

Valore della proprietà

String

Stringa contenente l'URL di un'immagine. Il valore predefinito è una stringa vuota ("").

Esempio

Nell'esempio di codice seguente viene illustrato come eseguire l'override della ImageUrl proprietà in una classe derivata che eredita da WebPartVerb. Questo codice sorgente mostra solo la parte del codice per la zona personalizzata e la WebPartVerb classe che esegue l'override della proprietà. Il resto del codice necessario per eseguire l'esempio è disponibile nella sezione Esempio della panoramica della WebPartVerb classe. Si noti che il codice di esempio assegna un'icona fittizia alla ImageUrl proprietà. Se si assegna un'immagine o un'icona reale, verrà visualizzata accanto al verbo nel menu dei verbi.

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

Commenti

La ImageUrl proprietà consente di usare una rappresentazione visiva personalizzata per i verbi come alternativa al rendering predefinito, che in genere è un pulsante o un collegamento ipertestuale. Se si assegna un URL alla proprietà, l'immagine viene visualizzata nei menu dei verbi (accanto al verbo) o direttamente nei moduli (al posto di un pulsante o di un collegamento ipertestuale che rappresenta il verbo).